The development cycles of nut aphid generation upper leaves in the central and mountain surrounding plains of Fergana valley

Abstract

In this article it is given information about development cycles of nut aphid generation upper leaves in the central and mountain surrounding plains of Fergana valley. From wintering eggs of nut aphids hatching of initiator individual larua depends on the temperature and relative dampness of spring. The amount of wintering eggs depends on the age and rising of nut trees and amount of one year’s branches. The hot temperature of spring, coarsening of nut trees and other factors cause the depression of nut aphids upper leaves in central plains and mountain surrounding zones.