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浙江省自实行大面积改制以来,春茬和双季连作稻的面积逐年在扩大,生育期较长的高产良种日益普及,致使部分迟熟早、晚稻的生育后期,分别遇到第二、四代三代螟的为害,在虫情早发年份造成白穗和枯孕穗等的损失还相当严重。因此,进一步开展调查研究,总结经验,提高防治技术,是十分必要的。现将我们调查研究结果综述如下,供作参考。 一、螟情和苗情的配合关系 螟害发生的轻重,取决于螟情和苗情的相互配合。根据各地调查资料,大体的情况是: 卵孵化始盛期与稻体破肚露穗期的关系:据黄岩县观察,以双季稻为主的单、双季混栽区,当第二代卵开始盛孵为害时,早稻已全部齐穗,白穗率在0.2％以下;但春茬田的早稻还在盛穗末期,白穗率则高达1.4％以上。建德县的观察,在双季、单季(早、中稻)混栽区,第二代卵始孵盛期,早稻穗已抽齐,白穗率仅0.3—0.6％;但中稻尚在抽穗盛期,白穗率高达2—3％。
Since the implementation of large-scale restructuring in Zhejiang Province, the area of spring stubble and double cropping continuous rice has been expanding year by year, and the growing high-yielding elm with longer growing period has been popularized. As a result, On behalf of the three generations of borer damage, early in the worm caused the ear of white spike and blubber and other losses are still quite serious. Therefore, it is very necessary to carry out further investigations and studies, sum up experiences and improve prevention and control technologies. Now we survey results summarized below, for reference. First, the relationship between the situation and the Miao Miao The severity of the occurrence of moth damage, depending on the situation and Miao Miao situation with each other. According to the survey data from different places, the general situation is: the relationship between the initial stage of egg hatching and the breakage and spike stage of rice body: According to the observation of Huangyan County, the single and double season mixed planting areas dominated by double cropping rice, When the eggs started to live in full bloom, the early rice had already got full heading and the white spike rate was less than 0.2%. However, the early rice in the spring crop was still at the end of Shueisui and the white spike rate was as high as 1.4%. Jiande County observations, in the double season, single season (early, middle rice) mixed planting area, the second generation of eggs during the initial hatching, early rice has been pumping Qi, white spike rate of only 0.3-0.6%; but the heading is still heading Peak, white spike rate as high as 2-3%.