论文部分内容阅读
白螟属于螟蛾科、似三化螟,但它成虫的雄体比三化螟小。全身上下呈银白色,它主要分布福建、广西、浙江盛产荸荠的省份。一、生活习性与为容性状白螟在福州、闽侯一带一年繁衍四代:第一代越冬代是在残留的荸荠块茎和稿头上渡过;第二代是寄生在荸荠田杂生的荸荠植株上;第三代开始迁入苗圃;第四代大田造成危害。白螟的卵多产在荸荠叶片上,也有产在其它杂草上,卵块一般30～60粒.表面有黄褐色的绒毛.白螟产卵力虽强,但在高温、干旱及寄生蜂的制约下,很多白螟的卵不能正常孵化,所以一般年份白螟不会造成危害。
Beige borer is Pyralidae, like three Borer, but its adult male smaller than the yellow rice borer. The whole body was silver white, it is mainly distributed in Fujian, Guangxi, Zhejiang Province, rich in water chestnuts. First, the habit of life and tolerance Beigeflies in Fuzhou, Minhou area multiply four generations a year: the first generation of overwintering generation is the remaining water chestnuts tubers and draft head to spend; the second generation is parasitic in the water chestnut field miscellaneous Of the water chestnuts plants; the third generation began to move into the nursery; the fourth generation of the field cause harm. Borer eggs prolific eggs in the water chestnuts, but also in other weeds, the egg block is generally 30 to 60. The surface has brown hair. Borer although strong oviposition, but in high temperature, drought and parasitic wasps Restrictions, many white borer eggs can not hatch properly, so the general vintage white borer will not cause harm.