论文部分内容阅读
为了了解玉米大小斑病的发生发展规律及其为害,以便来取有效的防治措施,夺取玉米高产稳产,我们对玉米大小斑病的发生发展规律及其为害进行了一些初步的观察和调查。一、玉米大小斑病发生发展规律观察和调查观察和调查方法:在长阳县良种场共分三期进行:第一期是春播(四月上旬)的直播玉米田,第二期是五月十七日播种的夏玉米、前茬油菜(县人武部试验田)。第三期是五月下旬播种的迟播夏玉米、前茬是小麦。均为出苗开始定点(五点平行取样)定株(一百株),三至五天观察一次,记载病情指数严重度、株发病率及外界环境条件等,结果如下:
In order to understand the occurrence and development of maize size spot disease and its damage, in order to take effective control measures to seize high and stable yield of corn, we carried out some preliminary observations and investigations on the occurrence and development of maize size spot disease and its damage. First, the occurrence and development of corn-sized spot disease observation and investigation of the law of observation and investigation methods: Changyang County, seed field is divided into three phases: the first phase is the spring sowing (early April) live corn field, the second is May 10 Summer sowing on the 7th, the former crop rape (County People’s Military Experimental Zone). The third period is the late sowing of late summer maize sowing, wheat crop before. All of them were fixed-point (five parallel sampling) plants (one hundred) at the beginning of emergence and observed once every three to five days. The severity index, strain incidence and external environmental conditions were recorded. The results are as follows: