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掌握三化螟田間卵量分布規律及卵块密度与螟害程度的关系,对預測一个地区三化螟发生量、为害程度及指导大田防治均有重要意义。为此,作者等于1964年进行了較为系統的調查和观察,現将初步結果整理报道如下,以供生产和进一步研究参考。一、成虫产卵活动的习性三化螟为单食性害虫,水稻是其唯一寄主。因此,成虫絕大多数在水稻上产卵;但在大发生的年份如1962年和1964年,除水稻外,还发現在稗草、三稜草、芦葦及狗牙根(土名)等野生植物上产卵。(一)产卵位置。螟蛾产卵位置,因水稻生长情况不同而異。据1963—1964年調查,
Grasping the relationship between the distribution of oviposition and the egg mass density and the damage degree of rice stem borer in the field is of great significance in forecasting the occurrence, damage degree and guiding field prevention and cure of a rice stem borer in a region. To this end, the author is equal to 1964 conducted a more systematic investigation and observation, the preliminary results are now reported below, for production and further study for reference. First, the habit of adult eggs spawning Three borers as simplex pests, rice is its only host. Therefore, the vast majority of adults lay eggs on rice; however, in large-scale occurrences such as 1962 and 1964, in addition to rice, it was also found that in the wild, such as barnyardgrass, sable, reed and bermudagrass Spawning on plants. (A) spawning position. The position of spawning moths differs according to the growth of rice. According to the 1963-1964 survey,