论文部分内容阅读
关于玉米缢管蚜,Rhopalosiphum maidis(Fitch)在其寄主——玉米、大麦和高粱上的生物学及习性已有大量报导。在依阿华州的 Johnston,对玉米缢管蚜在玉米上的活动情况已经作了20多年的监测。1977年春季的气候条件非常适宜早播、发芽和幼苗生长。发现有翅蚜是5月17日在4月13日播种的玉米上。当地一般的气候条件对种群结构影响甚微。在每公顷60000株玉米的密度下,对有翅蚜
With regard to the maize aphid, the biology and habits of Rhopalosiphum maidis (Fitch) on its host, maize, barley and sorghum have been extensively reported. Johnston, Iowa, has been monitoring maize aphid activity on maize for more than 20 years. The weather conditions of the spring of 1977 are very suitable for early sowing, germination and seedling growth. A winged aphid was found on corn planted on April 13 on May 17. The general climatic conditions on the ground have little effect on the population structure. Aphis gossypii at a density of 60 000 maize plants per hectare