Spatial variation in non-target effects of the insecticides chlorpyrifos, cypermethrin and pirimicarb on Collembola in winter wheat

✍ Scribed by Frampton, Geoffrey K

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 186 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199909)55:9<875::aid-ps52>3.0.co;2-s

✦ Synopsis

Contiguous winter wheat ®elds of similar cropping history and soil type were used in a study of the responses of Collembola to summer sprays of cypermethrin and pirimicarb in southern England. Chlorpyrifos was included in the study as a toxic standard. Epigeic arthropods were captured by suction sampling and crop-inhabiting species obtained by dissecting wheat ears. Eight genera of Collembola responded signi®cantly to the insecticide treatments. Collembolan abundance decreased after chlorpyrifos was applied but increased after use of cypermethrin. Negative effects of cypermethrin and pirimicarb on Collembola were not detected in this study. Effects of chlorpyrifos varied spatially as a result of faunal heterogeneity among the ®elds, despite apparent homogeneity of the site. Some species known to be susceptible to chlorpyrifos were absent from one or more of the ®elds. The implications of these ®ndings for the interpretation of non-target pesticide effects and the potential use of Collembola as bioindicators in ®eld studies with pesticides are discussed.