摘要
1986—1988年进行了不同栽培方式棉田小地老虎种群变化及为害规律研究。结果为:越冬代蛾全代总产卵量的52%在杂草上,28.92%在枯根须上,16.62%在土面,而产在棉苗上的卵仅占2.46%。田间卵量分布和幼虫发生量,麦棉套种棉田均大于纯作棉田。初孵幼虫寻找寄主的转移能力,以距寄主10cm 以内距离最高,转移率达60%以上,距寄主80cm以上就转移不到寄主上去。地膜内高温可使1～2龄幼虫死亡率达93%～100%,3～5龄幼虫死亡率仅占20%～30%左右,高龄幼虫耐热力大于低龄幼虫。不同种植方式棉田的受害程度,麦棉套种棉田重于纯作棉田,不盖地膜棉田重于盖地膜棉田,尤其是麦棉套种不盖地膜棉田受害最重,纯作盖膜棉田最轻,邻近油菜棉田受害重于远离油菜棉田。
The study conducted during 1986～1988 shows the following resul-ts.The oviposition percentage of hibernation moth is different with place,52%on weeds,28.92% on root hair,16.62% on the ground and 2.46% on cottonseedling.The quantity of egg and larva in the fields of interplanting cottonwith wheat is more than that of pure cotton.Primary—hatching larvae are easyto look for host cotton within 10cm and the translocation rate is over 60%.With a distance over 80cm,the translocetion rate is 0.Larva deaths can becaused by high temperature beneath plastic ground film in which the mortali-ty of 1～2 stadium larvae is 93～100% and 3～5 stadium 20～30%.The fieldsof interplanting cotton with wheat suffer heavier damage than fields of purecotton.
出处
《河南农业大学学报》
CAS
CSCD
1990年第3期368-373,共6页
Journal of Henan Agricultural University
关键词
棉田
棉花
地老虎
种群
为害规律
cotten field
black cutworm
population
oviposition
larva
law of growth and decline
damage habit
