Control of the Mango Shield Scale, Milviscutulus Mangiferae (Green) by Two Bio Rational Insecticides

Verticillium lecanii (Zimm) conidia were formulated in our laboratory (a myco-insecticide), WP (2.5%) and tested for its reduction on the mango shield scale, M. mangiferae (Green) different stages on the host plant trees comparing with a commercial insecticide (Pyriproxyphen (Admiral), 10% EC) for their reduction of each M. mangiferae stage as well as its total population. All the treated insect stages populations were differently affected in a function of the treated stage and the time after treatment (exposure time). The formulated bio-insecticide (myco-insecticide) was significantly more toxic than pyriproxyfen (admiral) in its effect on adult population especially after two weeks of treatment during the two season’s treatment. It showed an effect similar to the pyriproxyfen (admiral) against the other stages. Both the 1 st and the 2 nd nymph instars were less affected than the other treated stages (adult and crawler) with the two tested bio-insecticides. The low toxicity of the formulated V. lecanii to non-target biota encouraged us to stress on its entrance to the entomopathogenic fungi clique against the examined insect,