论文部分内容阅读
1968年以来,大螟在余西区为害开始增多。1969年部分玉米田死苗41％,水稻白穗重达51％。为了制服大螟,保证农业增产,1970年建立了由老农、干部和植保员组成的攻关小组。三年来,这个小组对大螟进行了比较系统的调查、室内饲养和药剂试验,初步摸到了大螟的发生规律,并提出了相应的测报方法与防治措施,有效地控制了大螟的为害。1972年全区一代大螟对玉米的为害率为1.3％,二、三代为害水稻造成枯心率、白穗率分别为0.6％、0.08％,而个别未治田块,第一、二、三代为害率分别达11.3％、2.7％、0.4％。第一代大螟第一代大螟发生于5、6月间,主要为害玉米。当地大螟以幼虫在稻根残株间过冬,开春后部分转移为害三麦,造成枯心和白穗。4月初,大部分幼虫开始化蛹。
Since 1968, Stem borer began to increase in the western part of the western region. In 1969, 41% of dead parts of maize field and 51% of white spike rice. In order to subdue Sesamia inferens and ensure the increase of agricultural output, a research team composed of peasants, cadres and plant protection workers was established in 1970. In the past three years, the team conducted a systematic investigation of Sesamia inferens, indoor rearing and pesticide tests, initially detecting the occurrence of Sesamia inferens and proposing corresponding methods of measurement and control measures to effectively control Sesamia inferens. In 1972, the rate of damage to corn by the Sesamia inferers in the whole region was 1.3%. The dry heart rate of rice in the second and third generations was 0.6% and 0.08% respectively. However, Respectively, up 11.3%, 2.7%, 0.4%. The first generation of Sesamia inferees The first generation of Sesamia in May and June, the main damage to corn. The local Sesamia inferens larvae in the rice stubs overwinter, part of the spring after the transfer of three wheat, resulting in dry heart and white spike. In early April most of the larvae began to pupate.