Side effects of some pesticides on the adult longevity, progeny production and prey consumption of Cryptolaemus montrouzieri Mulsant (Coccinellidae, Coleoptera).
The influence of six selective pesticides on the adult longevity, progeny production and prey consumption of the Australian ladybird beetle Cryptolaemus montrouzieri, a predator of several mealybug species, was studied. Adult longevity of both sexes of the predator was not adversely affected by the pesticidal treatments. Longevity varied from 32 to 46 days in males from 121 to 138 days in females exposed to different treatments. No detrimental effect was observed on the progeny production of C. montrouzieri treated with dichlorvos (0.10%) chlorpyrifos (0.05%), neem seed kernel extract (5%), dicofol (0.05%) and copper oxychloride (0.2%). But diflubenzuron (200 ppm) had a pronounced effect on the adult females yielding only 278 progenies compared to 419 by the untreated females. A maximum number of 142 mealybugs (Planococcus citri) was consumed by chlorpyrifos-treated larvae of C. montrouzieri. However, prey consumption by the larvae treated with other pesticides did not vary much from the untreated batch. It is suggested that these selective pesticides, except for diflubenzuron, could be considered in integrated pest management programmes.