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问:油菜摘黄叶为什么能防菌核病? 答:菌核病是长江中下游及东南沿海地区油菜的主要病害。防治菌核病应贯彻“预防为主,综合防治”的植保方针。生产实践证明,油菜花期摘除茎秆基部老黄叶,对防止菌核病的发生有一定的作用。这是因为: 一、摘除老黄叶减少了适合病菌侵入的对象。菌核病的初次侵染源主要来自于上年遗留在田间土壤的菌核抽生出子囊盘中放射出的子囊孢子,它不能直接侵害健壮的茎、叶,但对油菜花瓣及植株下部老叶、黄叶有极强的侵染力。老黄叶摘除,就减少了油菜受菌核病初次侵染的机会。
Q: Why rape pick yellow leaves can prevent nuclear scab? A: Sclerotinia is the main disease in the middle and lower reaches of the Yangtze River and the southeast coast of rape. Prevention and treatment of Sclerotinia should implement the “prevention first, comprehensive prevention and cure” policy of plant protection. Production practice shows that the rapeseed stems at the base of the removal of yellow leaves, to prevent the occurrence of Sclerotinia have a certain role. This is because: First, removal of yellow leaves reduce the suitable for bacteria invade the object. The primary sources of sclerotinia were mainly from the ascospores ejected from the ascosphere in the sclerotium of the soil left in the field last year. It could not directly attack the robust stalks and leaves, but had no effect on the rape petals and the old leaves , Yellow leaves have a strong appeal. Removal of the old yellow leaves reduces the chance of initial infection of sclerotinia sclerotinia.