Study on Pear Leaf Gall-midge

Key words: 
• pear leaf gall-midge (Dasyneura pyri Bouche) /
• morphological characteristics /
• bionomics /
• chemicle control

Abstract: In recent years, severe outbreak of Dasyneura pyri Bouche has occurred on pear tree in various parts of Zhejiang Provinee. The cecidomyiia develops on the leaves on which galls are caused by larval feeding. The morphology of egg, larva, pupa and adult of the cecidomyiia are described, and observations on its bionomics are recorded in the present paper. There are two or three generations a year in Lin'an County. It overwinters as fullgrown larva in the surface layer of the soil. Eggs are laid on the unopened leaf buds or the newly expanded leaves of the tree, and larva feeding results in the edges of the leaves curling along the apex inwards and becoming two galls. Up to 50 larvae are noted in a single gall, inujry always withers up the pear sprouts. Effective control may be achieved by spraying with omethoate or methamidophos, and decamethrin+dimetheat as well against the early larval stage.