论文部分内容阅读
我县第一代稻纵卷叶螟每亩虫口仅在50条左右,这些幼虫老熟后分散潜于叶鞘内侧或无效蘖上化蛹,羽化后繁殖的二代幼虫对早稻威胁较大。对二代发生期的预测,如用“查蛹”则花工;“查蛾峰”则发报时间迟。为了做到省工、快速、准确地预测二代发生期,1973年我将一代4～5龄幼虫带虫苞采来,分别放入试管(口径1.5cm、长18cm)内,另添一张新鲜叶片,后用纸封口,置室内饲养,每日观察化蛹情况,当试管内幼虫进入化蛹时,又组织4人,突击半天对田间幼虫化蛹情况进行调查。结果证明:室内试管饲养与室外幼虫发
The first generation rice leaf roller in our county only about 50 per acre insect population, the larvae mature dispersed after the leaf sheath or ineffective tiller on the pupae, emergence after emergence of second generation larvae greater threat to the early rice. The second generation of the forecast period, such as the use of “pupae” is spent; “check moth peak” is the late delivery time. In order to save labor, quickly and accurately predict the occurrence of the second generation, in 1973 I will be a generation 4 to 5 instar larvae with insect buds, respectively, into the test tube (diameter 1.5cm, length 18cm), add another After fresh leaves were sealed with paper, the animals were housed indoors and the pupae were observed daily. When the in vitro testicular larvae entered pupae, they were also organized into four groups. The results show that: indoor test tube feeding and outdoor larvae hair