Evaluation of some Insecticides against the Tendu Gall Insect, Trioza obsoleta Buckton (Homoptera: Psylidae)

Nearly 50 per cent of tendu leaves are spoiled by tendu leaf gall forming insect, Trioza obsoleta in many parts of our country. Ten insecticides in different concentrations were tested against this insect and spraying of the synthetic pyrethrolds, cypermethrin 0.03% a.i. or envalerate 0.03% a.i. twice in March-April at 15 days interval proved to be best to produce maximum number of gall free tendo leaves. Monocrotophos 0.03% a.i. proved to be next to above two synthetic pyrethroids.