Effectiveness of some insecticides against the mango leaf weevil, Rhynchaenus mangiferae Marshall and in increasing mango fruit yield.
Gajendra Singh, Misra P. N.
Author Affiliation: Govind Ballabh Pant University of Agriculture & Technology, Pantnagar, Nainital, Uttar Pradesh, India.
Indian Journal of Entomology 43 : 318-323
Abstract : Laboratory and field studies were carried out in Uttar Pradesh, India, between 1976 and 1978 to determine the effectiveness of some insecticides against Rhynchaenus mangiferae Mshl. and in increasing yield. Sprays containing 0.05% monocrotophos and 0.05% phosphamidon showed greater residual toxicity against adults fed on treated leaves in the laboratory 15 days after spraying than 0.05% quinalphos, 0.08% fenitrothion, 0.1% carbaryl or 0.07% endosulfan, and were also most effective in reducing pest numbers in the field, followed by endosulfan. A 300% increase in fruit setting and the number of fruits finally obtained was observed after treatment with monocrotophos, followed by endosulfan and phosphamidon. Better yields were obtained when spraying was started on 10 February than on 25 February or 10 March.