论文部分内容阅读
大螟,在我县一年发生四代,第一代主要危害田早玉米(注),以后各代危害水稻,水稻中以茎秆粗壮的粳糯谷和杂优品种受害最重。对田早玉米的危害,一般年份被害株率在5—7%,严重年份达57.2%(1974年),造成严重缺苗或是蛀吃茎秆节间幼嫩部分成一半环,致使玉米容易折断。因此,抓好田早玉米大螟的防治,对保证玉米全苗,夺取田早玉米丰收,压低以后各代的虫口,减少对水稻的危害,有着十分重要的意义。为了探索大螟的发生危害特点和对它的防治方法,我们从1972年以来,进行了观察和试验,取得一定效果。
Sesamia inferens, four generations a year in my county, the first generation of the main harm Tian Tian maize (Note), after all generations of endangering rice, rice stalks with thick stems of glutinous rice and miscellaneous varieties most affected. Harm to the fields of early corn, the average annual victim plant rate of 5-7%, 57.2% of severe years (1974), causing severe lack of seedlings or eating stalks internode young part into a half ring, resulting in easy maize Break. Therefore, to do a good job in field as early as the prevention and control of corn borer, corn to ensure that the whole plant, to seize the field early corn harvest, down after generations of insect population, reduce the damage to rice, is of great significance. In order to explore the characteristics of the occurrence and the control of Sesamia inferens, we have observed and tested since 1972, and achieved some results.