冬枣绿盲蝽的发生规律及防治适期

Occurence regularity and optimum control period of Lygus lucorum Meyer in winter jujube

近年来抗虫棉的大面积推广与应用,农药用量的明显减少,导致了绿盲蝽在棉花、冬枣间作田的大面积发生,造成了严重的经济损失。为了有效控制该虫的危害,减少防治成本,对绿盲蝽在冬枣树上的发生规律及防治适期进行了调查与试验。结果表明:绿盲蝽在冬枣树上发生的时间、发生量与气温、降雨量有一定的关系,气温偏高则绿盲蝽发生时间就较早,降雨量大则会影响绿盲蝽的虫口数量;绿盲蝽在冬枣树上发生的高峰期有5个,即4月下旬至5月上旬、6月中下旬、8月中旬、9月上旬和9月中下旬,但6月中旬的虫口量最大。根据冬枣树的生长特性,绿盲蝽在冬枣树上的第1、第2个发生高峰期为防治关键时期。利用20%的甲氰菊酯乳油500倍药液防治5次,防治效果可达88.3%,每公顷冬枣收入可增加4.5万元以上。

After insect-resistant cotton were planted in large scale,amount of pesticide application was reduced significantly,so that Lygus lucorum Meyer occurred in large scale in intercropped fields of cotton and winter jujube,and serious economic loss happened.In order to control L.lucorum Meyer and to decrease control cost,the occurrence regularity and optimum control period of L.lucorum Meyer were systematically studied.The results showed that occurrence time and quantity of L.lucorum Meyer on winter jujube had a certain relationship with temperature and rainfall.Higher temperature and earlier occurrence of L.lucorum Meyer.The heavy rainfall could reduce the quantity.L.lucorum Meyer had 5 high peak periods taking place on the last ten-day period of April to the first ten-day period of May,middle and last ten-day periods of June,middle ten-day period of August and middle and last ten-day periods of September,respectively.The quantities of L.lucorum Meyer were the biggest on middle ten-day periods of June.Acoording to the growth characteristics of winter jujube,the first and second high peak periods were key control periods.The control effect of 500 times liquid of 20%？fenpropathrin treated five times was up to 88.3% to control L.lucorum Meyer,and income could be increased over 45 000 yuan per hm2.