Persistence and vertical distribution of termiticide fipronil in modified ground board test |
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Authors: | KK Sharma Kalpana Vandana Sharma Pratigya Gupta Maisnam Jaya Anoop Kumar Bijendra Singh |
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Institution: | (1) All India Network Project on Pesticide Residues, Division of Agricultural Chemicals, IARI, New Delhi, 110 012, India |
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Abstract: | Fipronil termiticide belongs to phenyl-pyrazole class of chemical compounds. It has broad-spectrum activity particularly against
house hold pests such as cockroaches, mosquitoes, locusts, ticks, and fleas at both larval and adult stages. At high dosage
it can be used to control subterranean termites in building foundations. To evaluate long term efficacy against termites the
persistence and vertical distribution of fipronil was studied under natural weather conditions of Dehradun, India. Fipronil
was applied at four concentrations i.e. 0.05, 0.1, 0.25 and 0.5% a.i ha−1 by drenching 17 × 17 in.2 plot prepared as per modified ground board test. Soil samples were collected after 22, 38 and 56 months of treatment up to
the depth of 75 cm. The soil core was cut into five distinct sections i.e. 0–15, 15–30, 30–45, 45–60 and 60–75 cm depth. The
residues were extracted by shaking 20 g soil sample with acetone. The acetone extract was concentrated and cleaned-up over
florisil column. Fipronil residues were estimated on GLC at 220, 260, and 300°C oven, injector and detector temperature respectively.
Fipronil was found to persist beyond 56 months after application. Two metabolites viz. desulfinyl and sulfide-fipronil were
detected in sampling after 22 months of application that also dissipated with time. Fipronil residues were found up to 60 cm
depth. The residues in deeper layers dissipate slowly with time and after 56 months of treatment residues were detected only
up to 30 cm depth. |
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Keywords: | Fipronil Termiticide Persistence Vertical movement |
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