桃小食心虫地面防治技术的研究

Studies on chemical control techniques of Carposina niponensis Walsingham on the soil under the trees

连续 2年田间调查和观察结果表明 ,桃小食心虫越冬幼虫的出土期长达 70d以上 ,7月份出土量仍占 2 0 %以上。采用 4 0 %毒死蜱乳油 30 0倍液于幼虫出土始盛期进行地面处理 ,4 0d后防治效果达 83 3%。此法不仅防治效果好 ,而且持效期长 ,施药后 5 0d防治效果仍有 71 4 8% 。

Based on the investigations in fruit fields from 1998 to 2000, the emergence period of overwintering larvae of Carposina niponensis Walsingham lasted at least 70 days. The larva emergence was over 20% in July. The control efficacy of 40% chlorpyrifos emulsion diluted 300 times was 83.3% for 40 days after spraying the soils under fruit trees at the early emergence peak period of overwintering larvae. This technique had a good control effect and the effectiveness (71.4%) could last over 50 days.