Abstract
Fifth instars of the pistachio green stink bug, Brachynema germari, were subjected to different concentrations of a juvenoid, pyriproxyfen, and its biological effects were assessed. The treated fifth instars showed different abnormalities when metamorphosed to the adults. Morphological effects were classified as died nymph 5, nymph 6 (additional instar), nymphoid, adultoid and abnormal adult. Effective doses of 50% (ED50) for 1–2- and 3–4-days old fifth instars were significantly different from 7–8-days old fifth instars. Survival and time needed to begin metamorphosis was also different in treated insects. There was a significant decrease in longevity of the adults and egg hatching. In general, it can be concluded that B. germari as an pentatomid important pest shows highest sensitivity to a juvenoid at early of the last instar which can be considered in integrated pest management program when a juvenile hormone agonist is a candidate.
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