Techniques to Reduce the Impact of Asulam Drift from Helicopter Sprayers on Native Vegetation |
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Authors: | Rob H. Marrs Alan J. Frost |
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Affiliation: | aNess Botanic Gardens, Ness, Neston, L64 4AY, South Wirral, U.K.;bITE, NERC, Institute of Terrestrial Ecology, Monks Wood, Abbots Ripton, PE17 2LS, Huntingdon, U.K. |
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Abstract: | Asulam is often applied from the air to control bracken. This herbicide affects other ferns and spray drift could affect their survival. This paper discusses the use of bioassays to assess drift (a) spatially around a single bracken patch, (b) downwind from sprayed areas, and (c) spatially in undulating terrain and with different vegetation cover types. The aims were to develop policies to protect sensitive habitats. It is suggested that “no-spray” buffer zones in excess of 160–180 m are needed to minimise risk. Protection of rare ferns from overstorey vegetation or from steep slopes did not occur. Although less drift was found upwind there was significant damage at the end of the helicopter runs because of errors in switching the sprayer on and off. |
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Keywords: | herbicide drift asulam bracken helicopters buffer zones environmental protection |
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