北沙参钻心虫发生规律及防治研究

北沙参是河北省安国市种植的重要药材，近年受北沙参钻心虫为害，严重影响北沙参的产量和品质，钻心虫和幼虫集中在沙参生长点为害心叶，钻蛀根茎。１年发生四代，以幼虫在叶柄基部内侧结茧化蛹越冬。一、四代幼虫数量大，影响产量严重。提出用２０００倍的“１６０５”乳剂进行防治，效果在９０％以上，有效地控制其为害，使北沙参的产量增产４成以上。

Studies on the Occurrence and Control of Glehnia littorralis Borer

Glehnia littoralis is an important medicinal plant cultivated in Anguo of Hebei province. Recently, the growth of the plant was greatly effected by the pest Glehnia littoralis Borer. The lervae of which injured the tender leaves and stem base at the growing point of the plant and bored through the rhizome. They multiplied at a rate of four generations in one year. The pupa lived through the winter season in cocoons on petiole base of the plant. The first and second generation caused the most injury to the plant and greatly influenced me yield. In the field, it was found that spraying a 1: 2000 emulsion of parathion may achieve a 90 % control of the pest and increase a 40 % of yield.