论文部分内容阅读
随着两杂作物的推广,杂交高梁的种植面积不断扩大,高粱蚜虫发生危害,已成为生产上的一个突出问题。由于蚜虫吸食高梁的汁液,严重影响高梁的生长发育,轻者叶子变红,重者不能抽穗,严重地块颗粒无收。一般减产40—60%。全大队发生面积曾达600多亩。我们根据蚜虫的消长规律,采取边防治边试验,发现乐果毒砂(土)冶蚜效果高,药效长,而且简便易行。 一、高梁蚜虫发生情况 高粱蚜虫于6月初发现,6月21日调查,蚜虫主要在植株的下部叶片,7月份以后由于气温较高,蚜虫繁殖快,由7月7日的蚜株率11%,百株蚜量50头,7月25日的蚜株率增到100%,百株蚜量为2,100多头,发生严重的“窝子蜜”地块普遍出现流油株,百株蚜量为12万余头。蚜虫由底部叶片逐渐向中上部叶片蔓延,随着蚜虫不断增殖,天敌数量逐渐增多,因此8月间蚜虫数量逐渐下降。
With the popularization of two-cropping crops, the planting area of hybrid sorghum is constantly expanding, and the harm of sorghum aphid has become a prominent problem in production. Sorghum sorghum juice due to aphids, sorghum seriously affect the growth and development, the lighter the leaves turn red, severe cases can not be heading, severe block crop failure. The general cut 40-60%. The entire brigade area had reached 600 acres. According to the law of the growth and decline of aphids, we took edge control tests and found that dimethoate (dimethoate) of dimethoate was effective and long-lasting, and was simple and easy to operate. First, the sorghum aphid situation Sorghum aphid found in early June, June 21 survey, aphids mainly in the lower leaves of plants, since July due to higher temperatures, aphids multiply fast, from July 7 aphid strain rate of 11% , 50 plants per 100 aphids, July 25 aphid plant rate increased to 100%, aphid population of more than 2,100, the occurrence of serious “Wozi honey” plots generally appear flow oil plant, the amount of hundred aphids is More than 12 million heads. Aphids gradually spread from the bottom leaves to the middle leaves. As the aphids proliferated, the number of natural enemies gradually increased, so the number of aphids decreased gradually in August.