contaminated with lambda-cyhalothrin were introduced into an arena containing a harbourage with untreated cockroaches within. However, there was an overall ...
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ACQUISITION and TRANSFER of a LAMBDA-CYHALOTHRIN MICROCAPSULE FORMULATION by BLATTELLA GERMANICA P. J. Wege, A. F. Bywater, G. N. J. Le Patourel, and M. A. Hoppé Syngenta, Jealott’s Hill International Research Centre, Bracknell, UK Abstract The processes by which insects acquire toxic doses of the microencapsulated formulation of lambda-cyhalothrin (Demand CS) were studied using the German cockroach, Blattella germanica (L.). Cockroaches exposed to treated substrates acquired toxic doses of the insecticide rapidly, and HPLC analysis of cuticular washes of B. germanica established a linear relationship between exposure time and dose acquired during exposures of up to 4 minutes. These tests also showed that the pick-up process was highly efficient, with 3 times the LC90 dose acquired by cockroaches during
