二化螟危害结构及产量损失初探

通过对水稻二化螟在自然发生条件下的危害结构、水稻被害节位与产量损失的考查，表明在吉林稻区二化螟的危害结构有死孕穗、白穗和虫伤株，其中主要是虫伤株，占９２８０％。二化螟的蛀茎节位８２４４％集中在穗下３、４节上，并随着被害节位的增多和愈向上位节，瘪粒率愈高，产量损失愈大。

Preliminary Surver on the Damage Structure and the Yield Lose Caused by Striped Rice Borer

Though a serial investigations on the damage structure, bored node site and yield lose caused by striped rice borer occuring in the natural condition The results showed that:The damage structure included dead booting, empty ear and plants injured by insect in rice area of Jilin province. Plants injured was the most serious, about 92 8%among its structure.The most bored node site was 3,4 node under the ear,approximately 82 44%.The blights grain rate increases and yiled lose more,with bored node number adding,and bored node site ascending.