Seasonal incidence and heat unit requirement of Jassid, Empoasca kerri Pruthi in groundnut under Saurashtra conditions

摘要

Jassids. Empoasca kerri Prathi is one of the most important sucking pests of groundnut. It damages by sucking of the cell sap from the leaves, succulent vegetative tips and pegs of the groundnut plant with their sucking type of mouthparis, as a resultthe leaves become yellow and the plant growth remain stunted which results in heavy yield losses. The damage caused by jassids depends on population of damaging stage of insect, crop growth stage, cropping pattern in the area and climatology etc. (Patel and Patel, 1983).