养蟹稻田稻飞虱发生规律研究

通过系统调查和大田普查相结合的方法，研究明确了养蟹稻田稻飞虱的发生规律。养蟹田和非养蟹田稻飞虱的发生期基本一致。由于螃蟹对稻飞虱的控制作用，养蟹稻田稻飞虱的发生量比不施药对照田明显偏低，一般发生年份，不用药防治，即可控制稻飞虱的为害。养蟹田稻飞虱的分布与距养殖沟的距离呈显著的正相关。距养殖沟越远，虫量越高，防治时应注意区别对待。

STUDY ON THE OCCURRENCE RULES OF RICE PLANTHOPPERS IN RICE FIELD WITH CULTURAL CRAB

The occurrence rules of rice planthopper in rice field with cultural crab was ascertained through systemic investigation and field census. The occurring stage of rice planthopper in the paddy with or without cultural crab was similar. Owing to the controlling of crab to the rice planthopper, the number of rice planthopper was obviously less than that of the control paddies without used pestcide, And in general years, the rice planthopper can be controlled by cultural crab and without appling pestcide. The relationship of the distribution of rice planthopper and the distance of crab breeding line in the paddies with cultural crab was markedly positive. The further the distance crab breeding line to rice planthopper, the more number of rice planthopper, and it should be treated seperately when use chemicals.