Nitrogen fertilizer management for nitrous oxide (N<Subscript>2</Subscript>O) mitigation in intensive corn (Maize) production: an emissions reduction protocol for US Midwest agriculture

Nitrous oxide (N₂O) is a major greenhouse gas (GHG) product of intensive agriculture. Fertilizer nitrogen (N) rate is the best single predictor of N₂O emissions in row-crop agriculture in the US Midwest. We use this relationship to propose a transparent, scientifically robust protocol that can be utilized by developers of agricultural offset projects for generating fungible GHG emission reduction credits for the emerging US carbon cap and trade market. By coupling predicted N₂O flux with the recently developed maximum return to N (MRTN) approach for determining economically profitable N input rates for optimized crop yield, we provide the basis for incentivizing N₂O reductions without affecting yields. The protocol, if widely adopted, could reduce N₂O from fertilized row-crop agriculture by more than 50%. Although other management and environmental factors can influence N₂O emissions, fertilizer N rate can be viewed as a single unambiguous proxy—a transparent, tangible, and readily manageable commodity. Our protocol addresses baseline establishment, additionality, permanence, variability, and leakage, and provides for producers and other stakeholders the economic and environmental incentives necessary for adoption of agricultural N₂O reduction offset projects.     

Toward a framework of environmental risk management for CO<Subscript>2</Subscript> geological storage in china: gaps and suggestions for future regulations

China encourages the demonstration of carbon capture and storage (CCS) projects. In an effort to identify gaps and provide suggestions for environmental risk management of carbon dioxide (CO₂) geological storage in China, this article presents a concise overview of potential health, safety and environmental (HSE) risks and environmental management regulations for CO₂ geological storage in Australia, Japan, the United States (USA), the European Union (EU), and the United Kingdom (UK). The environmental impact assessment (EIA) experience of Shenhua Ordos Coal-to-Liquid (CTL) Project and PetroChina Jilin Oil Field enhanced oil recovery (EOR) is subsequently analyzed in light of our field investigation, and gaps in current EIA guidelines that are applicable to CO₂ geological storage projects are identified. It is found that there are no specific environmental risk regulations suitable for CO₂ storage in China, and environmental risk management lags behind the development of CCS technology, which presents a challenge to demonstration enterprises in terms of assessing environmental risk. One major challenge is the overestimation or underestimation of this risk on the part of the enterprise, and another is a lack of applicable regulations for government sectors to supervise the risk throughout CCS projects. Therefore, there is a pressing need for China to formulate environmental management regulations that include environmental risk assessment, mandatory monitoring schemes, environmental emergency plans, and related issues.     

CO<Subscript>2</Subscript> Mitigation and Renewable Oil from Photosynthetic Microbes: A New Appraisal

The only major strategy now being seriously considered for biological mitigation of atmospheric CO₂ relies entirely on terrestrial plants. Photosynthetic microbes were the focus of similar consideration in the 1990s. However, two major government-sponsored research programs in Japan and the USA concluded that the requisite technology was not feasible, and those programs were terminated after investing US$117 million and US$25 million, respectively. We report here on the results of a privately funded US$20 million program that has engineered, built, and successfully operated a commercial-scale (2 ha), modular, production system for photosynthetic microbes. The production system couples photobioreactors with open ponds in a two-stage process – a combination that was suggested, but never attempted – and has operated continuously for several years to produce Haematococcus pluvialis. The annually averaged rate of achieved microbial oil production from H. pluvialis is equivalent to <420 GJ ha ^-1 yr^-1, which exceeds the most optimistic estimates of biofuel production from plantations of terrestrial ``energy crops.' The maximum production rate achieved to date is equivalent to 1014 GJ ha^-1 yr^-1. We present evidence to demonstrate that a rate of 3200 GJ ha^-1 yr^-1 is feasible using species with known performance characteristics under conditions that prevail in the existing production system. At this rate, it is possible to replace reliance on current fossil fuel usage equivalent to ∼300 EJ yr^-1 – and eliminate fossil fuel emissions of CO₂ of ∼6.5 GtC yr^-1 – using only 7.3% of the surplus arable land projected to be available by 2050. By comparison, most projections of biofuels production from terrestrial energy crops would require in excess of 80% of surplus arable land. Oil production cost is estimated at $84/bbl, assuming no improvements in current technology. We suggest enhancements that could reduce cost to $50/bbl or less.     

Political commitment to CO<Subscript>2</Subscript> capture and storage: evidence from government RD&;D budgets

For CO₂ capture and storage (CCS) to succeed as a mitigation strategy, political commitment is one of several prerequisites. This article offers an appraisal of political commitment to a CCS strategy among high-income countries in Europe and North America: Which governments are committed, and what particular interests and concerns do they seek to accommodate by supporting CCS? In order to answer these questions, new data are reported on government CCS research, development and demonstration (RD&;D) budgets. RD&;D budgets divided by GDP is used as an indicator of political commitment, and explanations are sought for cross-national differences. The analysis shows that fossil fuels reserves and extraction within a country has a very strong bearing on funding levels. Likely explanations include the potential for combining CCS with enhanced resource recovery. All large economies (population >50 million) have a funding program. The smaller states that provide funding (Norway, Canada, the Netherlands) have the highest funding levels relative to GDP. These findings suggest that high-income petroleum producing countries are likely to be leaders in promoting CCS and a favorable regulatory environment. The fact that all large, high-income countries in the two regions now display some interest in CCS further improves its political outlook.     

The evolution of CO<Subscript>2</Subscript> emissions in international trade for major economies: a perspective from the global supply chain

Employing global multi-regional input–output models, this paper revisits the carbon dioxide (CO₂) emission trade (including exports and imports) and assesses their positions in the national emissions of 14 major countries with large national emissions or large emission trades during 1995–2009. It especially explores the evolution of the emission trades of these countries from both continuous time series and comparative perspectives, in order to provide an explanation for CO₂ emission spillovers across countries. The main findings obtained were as follows: (1) China was the largest CO₂ exporter to other countries, accounting for over 20 % of global exports since 2005; the CO₂ exports of the United States of America (USA), Germany, and Japan varied slightly over this time period, but overall, their proportions had decreased. (2) The CO₂ imports of the USA were the largest, occupying around 20 % of the global CO₂ imports; meanwhile, China’s CO₂ imports increased rapidly and ranked the second largest. (3) For Chinese Taiwan, its proportion of CO₂ exports in production-based emissions ranked the highest while that of the USA ranked the lowest; highly CO₂ import-dependent countries with an over 40 % proportion of CO₂ imports in its consumption-based emissions included France, Germany, Italy, and Spain, while China, India, and Russia remained the lowest, distinguished from their physical energy imports. These results suggested that the global policy makers should take the CO₂ emissions in trade into consideration when carefully accounting for national emissions inventories.     

CO<Subscript>2</Subscript> emission and economic growth of Iran

This research investigates the relationship between CO₂ emission and economic growth of Iran over 14 years from 1994 to 2007 using a national panel data set. The statistical and emission intensity methodologies are used for analyzing the data series. The study finds evidence supporting parameters which conclude the stability of significant correlation between CO₂ emission and economic development over time during the years under investigation in Iran. This relationship is investigated and discussed for the energy sectors of the country as well. The results confirm that in all sectors except of agricultural, there is a positive strong correlation between CO₂ emission and economic growth throughout the study period. In most sectors, CO₂ emission intensity (the emission per unit of GDP) doesn’t show increasing trends while the absolute emission is rapidly increasing by the economic growth.     

Uncertainty in Agricultural CH<Subscript>4</Subscript> AND N<Subscript>2</Subscript>O Emissions from Finland – Possibilities to Increase Accuracy in Emission Estimates

According to the United Nations Framework Convention on Climate Change (UNFCCC) and Kyoto Protocol under it, industrial countries have to estimate their greenhouse gas emissions annually, and assess the uncertainties in these estimates. In Finland, agricultural methane (CH₄) and nitrous oxide (N_2O) emissions represent 7% of anthropogenic greenhouse gas emissions, and globally the share is much higher. Agriculture is one of the most uncertain emission categories (representing over 20% of greenhouse gas inventory uncertainty in Finland), due to both high natural variability of the emission sources and poor knowledge of the emission-generating processes. In this paper, we present an uncertainty estimate of agricultural CH₄ and N₂O emissions from Finland in 2002. Uncertainties were estimated based on measurement data, literature and expert judgement, and total uncertainty in agriculture was calculated using Monte Carlo simulation. According to the calculations, agricultural CH₄ and N₂O emissions from Finland were 3.7 to 7.8 Tg carbon dioxide (CO₂) equivalents, 5.4 Tg being the mean value.Estimates of CH₄ emissions are more reliable than those of N₂O. N₂O from agricultural soils was the most uncertain emission category, and the uncertainty was not reduced by using available national measurement data of N₂O fluxes. Sensitivity study revealed that the uncertainty in total agricultural inventory could be 7% points lower, if more accurate emission estimation methods were used, including 1) improved data collection in area estimates of organic soils, 2) climate-specific methods for N₂O from agricultural soils as already presented in literature, and 3) more detailed CH₄ estimation methods for enteric fermentation which can be achieved by investigating national circumstances and digestible systems of animals in more detail.     

Different oceanic features of anthropogenic CO<Subscript>2</Subscript> and CFCs

The relationship between CFC-11 and anthropogenic CO2 (deltaDIC(ant)) concentrations in the world ocean are evaluated based on a simple off-line tracer ventilation model. Since the different solubility characteristics of CFC-11 and deltaDIC(ant) cause major differences in their oceanic uptake features, indicating different uptake pathways, a care should be taken while assessing deltaDIC(ant) in the oceans relying on CFC-11 concentrations. Evidence will be provided that CFC-11 storage occurs mainly in colder, high latitude regions, whereas the warmer, low latitude regions of the world ocean play an important role in both storing and absorbing anthropogenic CO2. This can be caused by an increased CO2 uptake or by a reduced CO2 release to the atmosphere at lower latitudes, both as a result of increasing atmospheric CO2 concentrations.     

Public acceptance and risk-benefit perception of CO<Subscript>2</Subscript> geological storage for global warming mitigation in Japan

CO₂ geological storage will be one of the cost-effective options for global warming mitigation, and this technology is under development widely in the world. However, the technology may face the challenge of public acceptance before its implementation. In order to evaluate the public acceptance, questionnaire surveys were conducted among Japanese university students. A cognitive map of geological storage, together with other major global warming mitigation options, everyday life activities, etc., was constructed by means of a statistical analysis of the responses to the questionnaire. The risk-benefit cognitive map consists of the following factors: “risk perception,” “benefit perception,” and “public acceptance.” The risk perception is further disaggregated into “dread risk” and “unknown risk.” Additionally, a second survey was conducted after providing the students with additional information on global warming and CO₂ geological storage, and the effects of the information on their perceptions were evaluated. The effects of risk and benefit perceptions on public acceptance were evaluated and discussed based on the cognitive maps representing the perceptions before and after providing the information. The analyses revealed that the benefit perception was more influential than the risk perception on the public acceptance of CO₂ geological storage. The benefit perception increased greatly after providing the information; however, the unknown risk remained considerably large. Further, RD&D relating unknown risk, for example, the monitoring technology for stored CO₂ and the risk assessment of CO₂ leakage, and the supply of related information to the public would be beneficial for increasing the public acceptance.     

Influence of CO<Subscript>2</Subscript> on the micro-structural properties of spider dragline silk: X-ray microdiffraction results

The mechanical properties of spider dragline fibres are altered by CO₂ exposure under anaesthetizing conditions during the spinning process. In order to relate these macroscopic changes to a microscopic model, the extrusion of dragline silk was studied by synchrotron radiation microdiffraction. A brief exposure of a female Nephila senigalensis spider to CO₂ results after an incubation time of less than 7 min in the extrusion of a thread (two fibres) swollen with water. The data are interpreted for a model of crystalline -sheet domains containing nanofibrils, which reinforce a network of protein chains. The protein network absorbs water, leaving the nanofibrils unaffected. A continuous flow of CO₂ results in a co-extrusion of a dragline thread and an isotropic silk fraction, which probably has a glycine-rich sequence. Long CO₂ exposure reduces the axial alignment of nanofibrils, presumably due to a partial destruction of the amorphous network.     

Floral CO<Subscript>2</Subscript> emission may indicate food abundance to nectar-feeding moths

As part of a study of the roles of the sensory subsystem devoted to CO₂ in the nectar-feeding moth Manduca sexta, we investigated CO₂ release and nectar secretion by flowers of Datura wrightii, a preferred hostplant of Manduca. Datura flowers open at dusk and wilt by the following noon. During the first hours after dusk, when Manduca feeds, the flowers produce considerable amounts of nectar and emit levels of CO₂ that should be detectable by moths nearby. By midnight, however, both nectar secretion and CO₂ release decrease significantly. Because nectar production requires high metabolic activity, high floral CO₂ emission may indicate food abundance to the moths. We suggest that hovering moths could use the florally emitted CO₂ to help them assess the nectar content before attempting to feed in order to improve their foraging efficiency.Electronic Supplementary Material  Supplementary material is available in the online version of this article at     

CO<Subscript>2</Subscript>-fertilization and potential future terrestrial carbon uptake in India

There is huge knowledge gap in our understanding of many terrestrial carbon cycle processes. In this paper, we investigate the bounds on terrestrial carbon uptake over India that arises solely due to CO ₂ -fertilization. For this purpose, we use a terrestrial carbon cycle model and consider two extreme scenarios: unlimited CO₂-fertilization is allowed for the terrestrial vegetation with CO₂ concentration level at 735 ppm in one case, and CO₂-fertilization is capped at year 1975 levels for another simulation. Our simulations show that, under equilibrium conditions, modeled carbon stocks in natural potential vegetation increase by 17 Gt-C with unlimited fertilization for CO₂ levels and climate change corresponding to the end of 21st century but they decline by 5.5 Gt-C if fertilization is limited at 1975 levels of CO₂ concentration. The carbon stock changes are dominated by forests. The area covered by natural potential forests increases by about 36% in the unlimited fertilization case but decreases by 15% in the fertilization-capped case. Thus, the assumption regarding CO₂-fertilization has the potential to alter the sign of terrestrial carbon uptake over India. Our model simulations also imply that the maximum potential terrestrial sequestration over India, under equilibrium conditions and best case scenario of unlimited CO₂-fertilization, is only 18% of the 21st century SRES A2 scenarios emissions from India. The limited uptake potential of the natural potential vegetation suggests that reduction of CO₂ emissions and afforestation programs should be top priorities.     

Development of a new model for the simulation of N<Subscript>2</Subscript>O emissions: a case-study on wheat cropping systems under humid Mediterranean climate

Improving the quantification of nitrous oxide (N₂O) emissions from agricultural land has become an issue of major concern due to its strong contribution to the greenhouse effect and to the fact that N₂O is now the most significant ozone-depleting emission to the atmosphere. The aim of this paper is to describe the development of a new field-scale, simple and empirical model that simulates monthly nitrogen (N) flows in cropping systems based on site characteristics and management practices. We explored its sensitivity for a Basque region of Spain growing winter wheat (Triticum aestivum L.) under humid Mediterranean conditions to varied weather conditions and different scenarios of: (i) fertiliser rates, (ii) soil texture, (iii) organic/mineral fertilisation, (iv) slurry injection/no injection and (v) tillage/no tillage. The model showed sensitivity to most of the changes in the tested parameters. On average, simulated N₂O emissions decreased: (i) with the decrease in N fertiliser rates, (ii) in lighter textured soils, (iii) with organic fertilisation, (iv) after non-injecting slurry and (v) under no-tillage. The model showed that it could be useful to simulate some of the potential trade-offs that may occur after implementation of specific N pollution mitigation measures (e.g. trade-offs in crop productivity and ammonia (NH₃) volatilisation after implementation of measures that target a reduction in N₂O emissions). In a validation exercise, simulated and measured yield and soil moisture showed reasonable agreement. Although the model showed discrepancies for monthly-averaged N₂O fluxes, the peak after fertilisation application was reasonably well simulated. These results and the simplicity and user-friendliness of the model suggest that its structure is appropriate and, if properly calibrated for different soil types and weather conditions, it could be a useful model to be used in carbon footprint studies or to develop site-specific emission factors for current or future climatic scenarios.     

A new post-Kyoto climate regime based on per-capita cumulative CO<Subscript>2</Subscript>-emission rights—rationale,architecture and quantitative assessment of the implication for the CO<Subscript>2</Subscript>-emissions from China,India and the Annex-I countries by 2050

Climate change is one of the most severe global problems in the 21st century. Main drivers are the combustion of fossil fuels, the emissions of industrial gases, emissions from agricultural sites and animal husbandry as well as deforestation. A new cooperative climate regime is necessary to meet the World’s energy and environmental problems against the background of China’s and India’s energy consumption growth. For the second commitment period of the Kyoto Protocol after 2012, a successor regime has to be agreed on. The current approaches, however, have a common weakness. They at the same time (a) do not acknowledge the historical responsibilities of the industrialized countries for the historical greenhouse gas emissions and the responsibility of developing countries for a large fraction of the current future emissions, and (b) do not provide for a fair distribution of emission rights. Against this background, this article aims at forecasting China’s and India's CO₂-emissions up to 2050 and developing a new suggestion for a post Kyoto climate regime based on a cumulated per capita CO₂-emission rights taking the weaknesses of the currently discussed post Kyoto approaches into account.     

Mitigation of CO<Subscript>2</Subscript> emissions from the road passenger transport sector in Bahrain

There is much optimism that the 2015 Conference of the Parties of the United Nations Framework Convention will yield an agreement on mitigation of climate change, to become effective in 2020. In this context, Bahrain represents a developing country with insufficient data to assess mitigation opportunities: its per capita carbon emissions rank among the world’s highest, yet there has been no research on the reduction potential of its rapidly growing transport sector. We examine this reduction potential and the costs of various mitigation measures and, further, explore barriers and the view of policymakers and experts. Potential benefits of combined mitigation scenarios are also identified based on their acceptability. We adopt a modified participatory method to develop the scenarios, using the long-range energy alternative planning (LEAP) modelling system, and find that an integrated policy approach can deliver a 23 % reduction in carbon dioxide emissions, costing 108 United States dollars per avoided metric tonne, with politically acceptable scenarios. Better performance, however, would require less acceptable approaches. These findings are significant for decision-making in Bahrain and other Gulf Cooperation Council countries; national target preparation and the setting of fuel economy standards should be begun promptly. We offer lessons to other developing countries on the timely regulation of technical specifications and numbers of passenger vehicles. Participatory approaches to the assessment of mitigation measures can advance environmentally effective, economically feasible and politically acceptable scenarios. The global community can use these results to provide necessary technical and financial assistance to developing countries.     

Soil moisture determines the effectiveness of two urease inhibitors to decrease N<Subscript>2</Subscript>O emission

Among the mitigation strategies to prevent nitrogen (N) losses from ureic fertilizers, urease inhibitors (UIs) have been demonstrated to promote high N use efficiency by reducing ammonia (NH₃) volatilization. In the last few years, some field experiments have also shown its effectiveness in reducing nitrous oxide (N₂O) losses from fertilized soils under conditions of low soil moisture. An incubation experiment was carried out with the aim of assessing the main biotic mechanisms behind N₂O emissions once that the UIs N-(n-butyl) thiophosphoric triamid (NBPT) and phenil phosphorodiamidate (PPDA) were applied with Urea (U) under different soil moisture conditions (40, 60 and 80 % water-filled pore space, WFPS). In the same study we tried to analyze to what extent soil WFPS regulates the effect of these inhibitors on N₂O emissions. The use of PPDA in our study allowed us to compare the effect of NBPT with that of another commercially available urease inhibitor, aiming to see if the results were inhibitor-specific or not. Based on the results from this experiment, a WFPS (i.e. 60 %) was chosen for a second study (i.e. mesocosm experiment) aiming to assess the efficiency of the UIs to indirectly affect N₂O emissions through influencing the pool of soil mineral N. The N₂O emissions at 40 % WFPS were almost negligible, being significantly lower from all fertilized treatments than that produced at 60 and 80 % WFPS. When compared to U alone, NBPT+U reduced the N₂O emissions at 60 % WFPS but had no effect at 80 % WFPS. The application of PPDA significantly increased the emissions with respect to U at 80 % WFPS whereas no significant effect was found at 60 %. At 80 % WFPS, denitrification was the main source of N₂O emissions for all treatments. In the mesocosm study, the application of NBPT+U was an effective strategy to reduce N₂O emissions (75 % reduction compared to U alone), due to a lower soil ammonium (NH₄ ⁺) content induced by the inhibitor. These results suggest that adequate management of the UI NBPT could provide, under certain soil conditions, an opportunity for mitigation of N₂O emissions from fertilized soils.     

The role of uncertainty in future costs of key CO<Subscript>2</Subscript> abatement technologies: a sensitivity analysis with a global computable general equilibrium model

Deep emission cuts rely on the use of low carbon technologies like renewable energy or carbon capture and storage. There is considerable uncertainty about their future costs. We carry out a sensitivity analysis based on Gauss Quadrature for cost parameters describing these technologies in order to evaluate the effect of the uncertainty on total and marginal mitigation costs as well as composition changes in the energy system. Globally, effects in total cost often average out, but different regions are affected quite differently from the underlying uncertainty in costs for key abatement technologies. Regions can be either affected because they are well suited to deploy a technology for geophysical reasons or because of repercussions through international energy markets. The absolute impact of uncertainty on consumption increases over the time horizon and with the ambition of emission reductions. Uncertainty in abatement costs relative to expected abatement costs are however larger under a moderate ambition climate policy scenario because in this case the marginal abatement occurs in the electricity sector where the cost uncertainty is implemented. Under more ambitious climate policy in line with the two degree target, the electricity sector is always decarbonized by 2050, hence uncertainty has less effect on the electricity mix. The findings illustrate the need for regional results as global averages can hide distributional consequences on technological uncertainty.     

Relationship between CO<Subscript>2</Subscript> at a rural site and integral measures of atmospheric stagnation,recirculation, and ventilation

Integral quantities, wind run, S, and recirculation factor, R, useful for describing air flow, are calculated and combined with CO₂ mixing ratios. Meteorological observations were obtained from a RASS sodar and CO₂ mixing ratios from a continuous analyzer installed at a rural site in the upper Spanish plateau. The measuring campaign spread over 3 years and two approaches were followed. The first approach considered integral quantities on a daily basis and two classifications of air flow, to date scarcely used. The first classification distinguished among stagnation, recirculation, and ventilation, the second considering synoptic, meso-, and local scales. Moreover, 52.94% of daily values handled in this paper corresponded to ventilation and 49.70% to synoptic scale. The main goal of this approach is the subsequent link between the two classifications: the synoptic scale was associated with ventilation, mesoscale with recirculation and local scale partially with recirculation. CO₂ observations were distributed in air flow groups following these classifications and mesoscale processes were satisfactorily described since noticeable evidence of transport from nearby cities was observed. In the second approach, S and R pairs were used and CO₂ mixing ratios were distributed following percent intervals of ventilation, calculated by binning these pairs. The main goal of the second approach is to consider only three groups of mixing ratios. In the first group, with high ventilation, mixing ratios were low. With intermediate ventilation, mixing ratios were medium, and with low ventilation mixing ratios were high. A contrast of 21 ppm between the third and first groups was obtained at the 95th percentile. Finally, the second group provided a contrast of 3 ppm between north and south directions and also between east and west attributed to transport from nearby cities.     

Interdisciplinary studies on the technical and economic feasibility of deep underground coal gasification with CO<Subscript>2</Subscript> storage in bulgaria

This paper presents the outcome of a feasibility study on underground coal gasification (UCG) combined with direct carbon dioxide (CO₂) capture and storage (CCS) at a selected site in Bulgaria with deep coal seams (>1,200 m). A series of state-of-the-art geological, geo-mechanical, hydrogeological and computational models supported by experimental tests and techno-economical assessments have been developed for the evaluation of UCG-CCS schemes. Research efforts have been focused on the development of site selection requirements for UCG-CCS, estimation of CO₂ storage volumes, review of the practical engineering requirements for developing a commercial UCG-CCS storage site, consideration of drilling and completion issues, and assessments of economic feasibility and environmental impacts of the scheme. In addition, the risks of subsidence and groundwater contamination have been assessed in order to pave the way for a full-scale trial and commercial applications. The current research confirms that cleaner and cheaper energy with reduced emissions can be achieved and the economics are competitive in the future European energy market. However the current research has established that rigorous design and monitor schemes are essential for productivity and safety and the minimisation of the potential environmental impacts. A platform has been established serving to inform policy-makers and aiding strategies devised to alleviate local and global impacts on climate change, while ensuring that energy resources are optimally harnessed.     

Evidence for a male-produced pheromone in <Emphasis Type="Italic">Tetropium fuscum</Emphasis> (F.) and <Emphasis Type="Italic">Tetropium cinnamopterum</Emphasis> (Kirby) (Coleoptera: Cerambycidae)

(E)-6,10-dimethyl-5,9-undecadien-2-ol (geranyl acetol), termed here fuscol, was identified as a male-produced pheromone emitted by Tetropium fuscum (F.) and Tetropium cinnamopterum Kirby. In field experiments, traps baited with synthetic fuscol alone were not significantly attractive, but the combination of fuscol plus host volatiles (a synthetic blend of monoterpenes plus ethanol) attracted significantly more male and female T. fuscum and female T. cinnamopterum than did host volatiles alone. This is the first homoterpenoid alcohol to be described in the Cerambycidae, and the first pheromone reported from the sub-family Spondylidinae.