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大豆在河套平原占播种面积的10％左右,在整个农作物布局上占有重要地位,而大豆食心虫是本地区的主要害虫。1957年本所(杭锦后旗陕坝镇)黄大豆的虫食荚率13.5％,虫食粒率12.6％。1962年永胜公社新丰大队虫食粒率高达60％。1963年本所大豆试验的41个品种被害豆粒在30—60％的有30个。现将本所1957年对大豆食心虫的生活习性及防治的初步观察结果介绍于下。 生活习性 1.成虫活动情况 8月2日大豆田间发现成虫,8月13—15日数量骤增,密度大的每平方米有成虫15—20头;密度小的每平方米有成虫3—5头。8月20日显著减少,平均每平方米有成虫1—5头,此后,田间即不易找到成虫。 8月14日调查355个豆荚,发现有卵荚数占5.1％,8月22日为14.22％,田间产卵期主要在8月中旬。 成虫在下午6—8时最为活跃,曾用马灯诱到少量成虫。
Soybean accounts for about 10% of the sown area in the Hetao plain and occupies an important position in the layout of crops. Soybean pomfret is the main pest in the area. In 1957, the stocking rate of peanut pods was 13.5% and that of pest-eating peanuts was 12.6%. 1962 Yongsheng Brigade Xinfeng brigade insect particles rate up to 60%. In 1963, 41 varieties of soybeans tested by the Institute of Soybean were 30 damaged in 30-60%. Now the Institute of 1957 soybean borer life habits and prevention and control of the preliminary observations introduced below. Habits 1 adult activity August 2 soybean field found adults, the August 13-15 August surge in the number of adults per square meter of density 15-20; density of adults per square meter 3-5 head. Significantly reduced on August 20, with an average of 1-5 adults per square meter, since then, the field is not easy to find adults. August 14 investigation of 355 pods and found that the number of pods accounted for 5.1%, August 22 was 14.22%, the main spawning period in the field in mid-August. The adults are most active at 6-8 pm and have been inducing small numbers of adults with lanterns.