【摘要】 蕹菜白锈病菌主要以卵孢子存留于土壤中,少量附着于种子上越冬。卵孢子大量形成于病株根部和茎基部的肿瘤组织内,部分产生于植株上部的病茎组织中。卵孢子具陆续萌发侵染的特性,早期形成的卵孢子部分在当年就能萌发侵染,但多数是在次年萌发,还有少部分可延至第三年才萌发侵染。孢子囊萌发的最适温度是25～30℃,还需有水膜。用孢子囊接种表明,病菌只能侵染植株的幼嫩组织。在福州地区,蕹菜白锈病常年在5月下旬左右开始发生,发病盛期是在7～9月。土壤中卵孢子量的多少是发病程度不一致的主要原因,连续降雨或台风暴雨能加剧病害的流行。更多还原

【Abstract】 The white rust caused by Albugo ipomoae-panduranae was one of the most important disease of water Spinach(Ipomoea aquatica) in Fuzhou.In autumn on the root and stem bases of the diseased plants a lot of tubercles full of oo(?)pores were formed. Oospores were also found in the diseased aerial stem-tissues. These oospores were able to survive for one to two years in the soil and servedas the majior primary source of infection. However some oospores, however, could soon germinate and become secondary source of infection together with the sporangia.The disease usually began to appear in June when the average temperature of days reached about 25℃.The seriously infesting stage occurred frim mid-July to mid-September. and the disease ceased to develop after late September. A high relative humidity facilited development of the disease.更多还原