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油菜“花而不实”是一种生理性病害,多发生在甘蓝型油菜上。从1956年甘蓝型油菜在我省开始推广起,奉化县就有发生。随着油菜生产发展,甘蓝型良种日益普及,“花而不实”发生地区也逐渐增多,到目前为止,曾发生此病的地方已达七个地区的二十二个县,且都在山区、半山区和丘陵地区。油菜罹“花而不实”病,减产很大,一般减产二至三成,严重的损失九成以上,甚至失败。如1974年丽水等六县的九个典型材料指出,有209亩甘蓝型油菜长势很好。“花而不实”未表现前估产都在200斤,甚至300斤以上,“花而不实”发生后,结果有92亩失收,117亩只
Rape “flower but not real” is a physiological disease, occurred in the rapeseed. From 1956 cabbage rape began to promote in our province, Fenghua County have occurred. With the development of rapeseed production, the growing popularity of “Brassica napa” varieties has also gradually increased in areas where the occurrence of “blossoming is not real”. So far, the disease has occurred in 22 counties in seven districts and all are in the mountains Mid-levels and hilly areas. Rape suffers from “blossoming but not real” disease, with a large reduction in output, with a general reduction of 20% to 30% in production, a serious loss of more than 90% and even failure. Nine representative materials in six counties such as Lishui in 1974 pointed out that 209 mu of B. napus grew very well. “Blossoming” did not show pre-production are 200 pounds, or even more than 300 pounds, “flowers and not real” after the results of 92 acres of lost, 117 acres only