信阳市是河南省油菜主产区,常年油菜种植面积150万亩左右,其中60%以上为甘蓝型杂交油菜。1999～2000年度信阳市杂交油菜生长期间遭受了严重自然灾害,减产40%左右。为此,我们对杂交油菜种植面积较大的固始、息县、淮滨等县进行田间调查分析,认为冻害和旱害是造成信阳市杂交油菜 Xinyang City, Henan Province is the main producing area of ​​rapeseed, perennial planting area of ​​about 1500000 acres, of which more than 60% of the cabbage-type rapeseed. During the period from 1999 to 2000, Xinyang hybrid rape suffered serious natural disasters during its growing period, with a reduction of about 40%. Therefore, we conducted a field survey on Gushi, Xixian and Huaibin counties where the area for hybrid rapeseed cultivation is relatively large. It is concluded that frost damage and drought damage are the major causes of cross rape