EFFECTS OF AN ENCAPSULATED FORMULATION OF LAMBDA-CYHALOTHRIN ON NEZARA VIRIDULA AND ITS PREDATOR PODISUS MACULIVENTRIS (HETEROPTERA: PENTATOMIDAE)
Abstract
Insecticidal effects of an encapsulated formulation of lambda-cyhalothrin on the southern green stinkbug Nezara viridula (L.) and one of its predators, Podisus maculiventris (Say), were investigated in the laboratory. Both pentatomids were exposed to the insecticide via contaminated drinking water and by residual contact. Nymphs and adults of N. viridula were more susceptible to the insecticide than nymphs of P. maculiventris, both by ingestion and contact exposure. For the respective ways of exposure, LC50 values calculated for P. maculiventrisfourth instars were 30-190 times and 3-13 times higher than those of N. viridulafourth instars. Insecticidal activity of the pyrethroid by ingestion was 6-10 times greater against nymphs of N. viridula than against adults of the pest. In both the ingestion and residual contact experiments, nymphs of P. maculiventris recovered from initial knockdown. LC50 values for predator nymphs increased 1.7- to 2.7-fold between 24 and 48 h after the start of the experiment. Recovery from knockdown was not observed in N. viridula. The data from the current laboratory study suggest that encapsulated lambda-cyhalothrin may be effective for controlling the southern green stinkbug with little adverse effects on the predator P. maculiventris, but field experiments are needed to confirm this. Possible reasons for the differential toxicity of the insecticide to both pentatomids are discussed.View this article in BioOne
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