Ra. Alzogaray et al., EVALUATION OF HYPERACTIVITY PRODUCED BY PYRETHROID TREATMENT ON 3RD INSTAR NYMPHS OF TRIATOMA-INFESTANS (HEMIPTERA, REDUVIIDAE), Archives of insect biochemistry and physiology, 35(3), 1997, pp. 323-333
The hyperactivity produced in third instar nymphs of Triatoma infestan
s by their exposure to films of deltamethrin or cis-permethrin was eva
luated. Both pyrethroids produced a significant increase in locomotor
activity at 26 and 36 degrees C but not at 16 degrees C. At 26 degrees
C, only deltamethrin produced hyperactivity when topically applied on
the dorsal side of the nymph's abdomen. However, both pyrethroids pro
duced hyperactivity when topically applied on the head of the nymphs.
Hyperactivity was not observed when nymphs were treated with N-ethylma
leimide (20 mu g/insect) before exposure to the pyrethroids. The effec
t of both insecticides on locomotor activity reversed the inhibitory i
nfluence on locomotion elicited by contact with the walls of the exper
imental arena (thigmotaxis). (C) 1997 Wiley-Liss, Inc.