临渭区梨树栽植面积约5000hm2。2006年7月底至8月初,临渭区吝店镇、下吉镇、凭信乡等老果区梨树套袋果梨黄粉蚜[Aphanostigma jakusuiensis (Kishida)]钻袋为害严重,虫害发生面积约2000hm2。重发梨园引起大量落果,损失惨重,个别果园全军覆没,严重挫伤了果农积极性,对本区果业持续健康发展造成一定威胁。 Linwei pear tree planting area of ​​about 5000hm2 .2006 end of July to early August, Linwei District, Lin Town, under the town, with the letter of the old fruit pear walnut bag pear fruit aphid [Aphanostigma jakusuiensis (Kishida)] drill Severe bag damage, insect pests occurred in an area of ​​about 2000hm2. Pear orchards caused heavy losses and heavy losses, the individual orchards were annihilated by the army and seriously dampened the enthusiasm of the farmers and posed a certain threat to the sustained and healthy development of the fruit industry in the area.