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在1981—82年用省植保所鉴选的拟澳洲赤眼蜂优良品系苹澳赤防治试验示范的基础上,1983年又在大荔县城关、汉村、许庄等7个公社进行了2万多亩的示范推广,防效显著。试验方法与1982年基本类同(见《陕西农业科学》1983年1期)现将结果续报如下。二代棉铃虫田间卵量及卵寄生率:选择生长势不同的棉田3块(地膜棉一块,1、2类直播棉两块),每块地对角线5点标记100株,逐日调查。结果是:6月16日见卵,20日卵量急骤上升,26日为卵高峰日,百株卵量达30粒。放蜂期间(22—26日)因间断小雨,对成蜂在田间的扩散和寄生有一定影响。
Based on the pilot demonstration of apple-red prevention and control trial of Trichogramma from Zhejiang Province in 1981-82, 7 communes in Chengguan, Hammura and Xuzhuang of Dali County were also conducted in 1981 Demonstration and promotion of 10,000 mu, significant effect. The test method is similar to that of 1982 (see Shaanxi Agricultural Sciences, 1983, 1). The results will now be renewed as follows. Second-generation cotton bollworm ova and eggs in the field of parasitism: Select the growth potential of different cotton fields 3 (cotton film, 1,2 live cotton two), each piece of diagonal 5 markers 100 daily survey. As a result, eggs were seen on June 16 and the amount of eggs on the 20th rose sharply. On the 26th, the egg was on its peak, and the number of eggs reached 30. During the bee-keeping (22-26 days), intermittent drizzle caused some impact on the dispersal and parasitization of bees in the field.