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梨小食心虫(Grapholitha molesta Bu-sck)简称梨小,在北京地区一年发生4—5代,发生期长达5—6个月,寄主种类繁杂,防治困难。以往主要靠施用DDT、1605等农药进行化学防治。近些年来国内外
Grapholitha molesta Bu-sck, abbreviated as Pear, occurs 4-5 generations a year in Beijing area with a period of 5-6 months. The host species is complex and difficult to control. In the past mainly by the application of DDT, 1605 and other pesticides for chemical control. In recent years at home and abroad