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近年来宁波地区大螟虫有逐年蔓延发展的趋势,在鄞县、镇海、余姚、诸暨、奉化等县,第一代为害损失远远超过二、三化螟,严重地威胁水稻的增产。1958年我们进行了为害特点的调查。兹将调查结果,简报如下,以供参考。 一、第一代大螟蛾在田边杂草的产卵情况 今年第一代大螟现蛾较早(4月2日初见),此时还没有普遍插秧,但田埂杂草生长嫩绿,故大部分蛾子集中在上面产卵。主要杂草有看麦娘Alopecurus fu-
In recent years, the stem borers in Ningbo have a tendency to spread year by year. In Yin County, Zhenhai, Yuyao, Zhuji and Fenghua Counties, the loss of the first generation far exceeds that of the second and third borer, which seriously threatens the increase of rice yield. In 1958 we conducted a survey of the peculiarities of the disease. The survey results, briefings are as follows for reference. First, the first generation of Ophiopogon in the edge of the field of spawning weeds moth earlier this year, early moth (early April 2), at this time there is no universal transplanting, but frog weed grow green, Therefore, most of the moths concentrate on spawning above them. The main weeds have to watch Amano Alopecurus fu-