论文部分内容阅读
防治双季晚稻矮缩病,采用连片种植,改进耕作栽培方法,选用抗(耐)病品种等农业技术措施,再在本田初期及时治虫1—3次,能达到80%以上的防病效果。不用农业防治,单在本田初期及时治虫1—3次防治效果为59.6%。但对小面积晚稻,在本田初期于介体昆虫迁飞高峰期及时治虫2—4次,防病效果也能达到80%以上。欲使晚稻后期的株发病率分别控制在1%、3%和5%以下,其本田初期防病治虫的指标是:当介体昆虫的带毒率为2.5%时,分别为每百株苗虫量4、12和22头;而当介体昆虫的带毒率为5%时,分别为每百株苗虫量2、6和10头。
Prevention and treatment of double season late rice dwarf disease, the use of contiguous planting, improved cultivation and cultivation methods, the selection of resistant (resistant) varieties and other agricultural technology measures, and then in the early Honda worm 1-3 times in a timely manner, can achieve more than 80% of the disease control effect . No agricultural control, a single early in the Honda worm prevention and control 1-3 times the effect of 59.6%. But for a small area of late rice, Honda in the early stages of migratory insects 2-4 times in a timely manner, prevention and control effects can reach more than 80%. In order to control late incidence of late rice plants were less than 1%, 3% and 5%, respectively, its Honda initial disease control pest indicators are: when the vector of insects with a 2.5% rate of poisoning, respectively, for each hundred seedlings 4, 12 and 22 insects respectively. When the entrained rate of mediator insects was 5%, the number of insects was 2,6 and 10 respectively.