The preservation of natural enemies is one of the basic foundations for integrated pest management. Botanical insecticides
have shown low impact on beneficial arthropods in relation to survival. Insecticides studies usually focus on the direct
physiological effects of insecticides, whereas relatively little attention is placed on the behavioral response to exposure.
A study was conducted to evaluate the effect of the botanical insecticide neem (
Azadirachta indica
A. Juss.; Meliaceae)
on the mating behavior of the predatory stinkbug
Podisus nigrispinus
(Heteroptera: Pentatomidae). Unmated 5 to 7 d-old
adults, separate by sex, were exposed to azadirachtin per contact on the treated surface. The treatments were composed
for: untreated male and female; untreated male and treated female; treated male and untreated female; and treated male
and female. Azadirachtin affected the duration of first mating (Wilcoxon test,
χ2 = 13.38,
df = 3,
p = 0.004), which resulted
in a higher effective average time of mating (EATM
50) for treatment whose only female was treated with azadirachtin.
This finding points to a sublethal effect of azadirachtin on mating behavior of
P. nigrispinus that may compromise its
reproduction.
