Grychanuk V. Cecidomyiidae - the pests in apple and pear nursery and the regulation of their numbers in Right Bank Forest zone of Ukraine.

The object of research - fields of nurseries of apple and pear, varieties, Dasyneura mali Kiеffer, Dasyneura pyri Bouche andThomasiniana oculiperda Rubs., insecticides. The purpose - substantiation and improvement of chemical protection of nurseries of apple and pear from harmful gall midges on the basis of features of their biology and application of effective receptions of the control of their number in the Right-bank Forest-Steppe of Ukraine.. Specify the species composition of phytophagous apple and pear in the fields of nurseries, highlight the most dangerous; To determine the features of the biology of gall midges and to establish their harmfulness in nurseries of pomegranate crops; To assess the damage of the main varieties of apple and pear with leaf gall midges; To determine the effectiveness of preparations against harmful gall midges; To improve the system of chemical protection of nurseries of apple and pear from harmful gall midges and to estimate its economic efficiency. Methods: field and laboratory experiments, statistical method. Species composition of harmful entomoacarocomplex of rotation in the apple and pear nurseries. It was established that among 88 phytophagous the most dangerous pests are Cecidomyiidae that harm 8,8 - 69,7% of plants. The biology features of D. mali, D. pyri and T. oculiperda were determined. The terms of appearance, number of generations, trophic relationship and a harmfulness of mentioned species were established. The damage of 67 apple varieties and 38 varieties of pear fruit crops caused by D. pyri, D. mali and T. oculiperda was reviewed, some varieties were identified as less harmed by Cecidomyiidae. A technical of modern insecticides is defined during the vegetation in the crop rotation fields of apple and pear nurseries. The protection system of seedlings and rootstocks of fruit-tree nurseries against harmful Cecidomyiidae is evidenced and offered. The branch is agriculture,entomology, plant protection.