【摘要】 短光照是引起玉米螟滞育的信息,处在北纬35°—36°,东经112°—113°的山西沁水玉米螟种群,在太原控制温度25℃,人工饲料饲养下测定,其临界界光周期为14小时30分钟。当光照少于此临界期,诱发滞育;而多于此临界期,则回避滞育。对于玉米螟幼虫任一单独龄期给予短光照处理,不能或几乎不能引起滞育;而相邻虫龄连续接受短光照处理,则可导致滞育。连续接受短光照处理的时间愈长,滞育率也愈高。幼虫对光照刺激反应的敏感期为自孵化后至5龄末进入滞育前的整个阶段,而非仅为3—4龄。高温在一定程度上抑制短光照诱发滞育的作用;低温在一定程度上抑制长光照回避滞育的作用。以长光照累代处理人工饲料饲养的亚洲玉米螟至三,四十代以上、如经短光照处理则照常发生滞育,其滞育特性仍未改变。更多还原

【Abstract】 The influence of photoperiod and temperature was studied on the diapause of the Asian com borer Ostrinia furnacalis (Gueiiee) reared on artificial diet in the laboratory. Short light period gave signal to the inception of diapsue and the critical photoperiod of the corn borer population collected from Qinshui (35°-362 N and 112°-113°E) of Shanxi Province is 14.5 hours at 25℃ as determined in Taiyuan. When the light period was shorter than the critical period larval diapause was induced whereas longer light period would inhibit diapause. Short light period on a single larval instar was not effective in the induction, its effect increased when adjacent larval instars were exposed to short light period continually, and the longer the time of treatment, the higher the percentage of diapause would be induced. Diapause induced by short light period was irreversible.The influence of temperature on the inception of diapause was demonstrated. High temperature inhibited the effect of short light period in inducing diapause to a certain extent while low temperature had the reversed effect. Corn borers reared on artificial diet under long light period for 40 generations could still be susceptible to short light period treatment.更多还原