再生稻与三化螟越冬幼虫的关系的研究

在华南，秋季水稻收获后，留在田间的一些稻桩，既含有再生稻株，亦藏蛰伏的三化螟幼虫，当再生稻桩率为14％～19％时，其中藏有的三化螟幼虫占该虫总数的47％～65％。由于三化螟得到再生稻株的保护，在整个越冬期间藏于再生株内的蝗虫死亡率偏低，至多为非再生株同时的50％，再生株百株活虫数为26～42头，而非再生株内仅为1～7头。

Studies on the relation between the ratooning rice and the hibernating larvae of Scirpophaga incertulas (Walker)

In Soutk China, some of the rice stubbles left in the field after thc autumn crop being harvested cont an the ratooning rice plants as well as the hibernating larvae of the paddy borer, Scirpophaga incertulas (Walker). The percentage of these stubbles was found to be 14~19%only, while they contained 47%~65% of the total population of the larvae.The paddy borers are protected by the ratooning rice plants. During the entire period of hibernation, the mortality of the larvae boring into the ratooning rice plants was much lower than that of those which bored into the non-ratooning stems. The former was not more than half of the latter. Moreover, 100 ratooning rice plants could harbor as many as 26~42 living paddy borers while 100 non-ratooning stems harbored less than 7.