Locomotor activity, knockdown, and recovery in first instar nymphs of Blatella germanica (Dyctioptera: Blattellidae) treated with imidacloprid

SFARA V; ZERBA EN; ALZOGARAY RA

BELGIAN JOURNAL OF ENTOMOLOGY

Royal Belgian Entomological Society

Lugar: Brussels (Belgium); Año: 2005 vol. 7 p. 113 - 119

1374-5514

Locomotor activity, knockdown, and recovery were studied in first instar nymphs of Blattella germanica treated with a neonicotinoid insecticide, imidacloprid. No effects on locomotor activity were observed in insects placed on filter paper impregnated with 3, 30, or 300 ìg/cm of imidacloprid. The Knockdown Dose 50% (KD50) for imidacloprid was 63.0 and 317.3 ng/insect at 18 and 28°C, respectively, leading to a temperature coefficient of ?5.0. The variation of KD50 values as a function of time was also studied, with and without simultaneous application of piperonyl butoxide (PBO). Recovery from the knockdown was observed in insects treated with imidacloprid alone, whereas no recovery was observed when insects were simultaneously treated with PBO. These results suggest that imidacloprid is metabolized by mixed-function microsomal oxidases.