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褐飞虱是我国南方稻区的大害虫,在我省为四大稻虫之一,七十年代以后,为害更加猖獗。对褐飞虱的越冬虫源问题,较长期以来,国内外争论很大。同外有关报导,褐飞虱的寄主有60多种,主要寄主为水稻、茭白、甘蔗、李氏禾(又名游草)、假稻等,近年来,国内一些报导:褐飞虱是专食水稻的害虫,只在四季有水稻存活的地区才能越冬。因此认为在我国只有海南岛五指山分界岭以南地区为常年繁殖区,雷州半岛北纬21°为间隙少量过冬区。在我国过冬以一月份12℃等温线为北限,常年在北回归线以北无
Nilaparvata lugens is a large pest in the rice planting area in southern China. It is one of the four major rice pests in our province. After the seventies, brown planthopper was more rampant. Overwintering insect pests of the brown planthopper have long been controversial both at home and abroad. In the same report, there are more than 60 hosts of BPH, the main hosts are rice, white rice, sugarcane, Lee Woo grass (also known as grass), fake rice, etc. In recent years, some domestic reports that BPH are pests , Only in the four seasons of rice to survive the winter. Therefore, it is considered that there are only a few perennial breeding areas in the south of Wuzhishan boundary in our country and 21 ° north latitude in Leizhou peninsula. In our winter to January 12 ℃ isotherm for the northern limit, all year round in the Northern Tropic of Cancer no