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1973～1981年进行了一系列试验来研究处于低纬度的广东翁城(24°22＇N)、始兴县(24°57＇N)和广州(23°N)第四代三化螟幼虫光周期诱发滞育的效应。结果表明,光周期是诱发滞育的主导因子。在自然光温条件下,光周期短于13小时显著地诱发三化螟滞育,长于14小时则促进化蛹,属典型的长日长反应型。在25℃条件下,始兴县和广州种群的临界日长分别为13小时20分和13小时18分。幼虫对光周期反应起累积效应。在25℃,LD13.5:10.5、LD14:10、LD15:9和LD24:0条件下,其临界日数依次为18、14、13和10天。幼虫对光周期反应具后效作用,短光周期不能使接受过长光周期的非滞育幼虫倒逆。广东4～5世代区第4代三化螟发育分化而形成局部世代的原因得到科学的解释。
A series of experiments were conducted from 1973 to 1981 to investigate the effects of the 4th generation yellow rice borer larvae at Wengcheng (24 ° 22’N), Shixing (24 ° 57’N) and Guangzhou (23 ° N) at low latitudes Photoperiod-induced diapause effect. The results showed that photoperiod was the dominant factor inducing diapause. In the natural light and temperature conditions, light cycle shorter than 13 hours significantly induced Diaphanocarpus larvae, longer than 14 hours to promote pupation, is a typical long-day reaction type. At 25 ℃, the critical daylength of Shixing County and Guangzhou populations were 13 hours and 20 minutes and 13 hours and 18 minutes, respectively. Larvae have a cumulative effect on photoperiod response. At 25 ℃, LD13.5: 10.5, LD14: 10, LD15: 9 and LD24: 0, the critical days were 18, 14, 13 and 10 days respectively. The larvae have a post-photoperiod effect on the photoperiod response, and the short photoperiod does not upset the non-diapause larvae that have received the long photoperiod. Guangdong 4 ~ 5 generations of fourth generation borer development and differentiation of the formation of local generation of reasons for a scientific explanation.