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今年,我社中熟油菜龙头病严重发生。株发病率一般为49.7%,最高为74%;病情指数一般为16.3%,最高为25%;损失率为7.7%,最高为16%。晚熟油菜龙头病发生很轻,基本上未造成损失。一.发生特点:今年油菜的龙头病是中熟品种重于晚熟品种。龙头暴发期晚于73年,中熟油菜上龙头于4月2日始见,比73年迟13天,13～17日为第一次龙头(主茎龙头较多)暴发期,4月19～22日为第二次龙头(主要是分枝上)暴发期,均晚于73年。冬春叶发病率高
This year, our club cooked rape faucet serious occurrence. The incidence of strains is generally 49.7%, up to 74%; condition index is generally 16.3%, up to 25%; loss rate of 7.7%, up to 16%. Late ripening rape faucet occurred very light, basically did not cause any loss. One. Occurrence characteristics: This year’s leading disease of rape is medium maturing varieties heavier than late maturing varieties. The leading outbreak was later than 73 years. The middle-aged rape faucet began to see on April 2, 13 days later than 73, and the first faucet (main stem faucet was more) outbreaks on April 13 to April 19 ~ 22 for the second leading (mainly branch) outbreak, were later than 73 years. The incidence of winter and spring leaves is high