番茄叶霉病初侵染再侵染及发病条件的研究

Studies on Attack and Epiphytotic Conditions As Well As Primary and Secondary Infection Sources of Tomato Leafmold

本试验研究证明了番茄叶霉病菌以菌丝体在病残体内或以菌丝潜伏在种皮内越冬，是第２年初侵染主要来源。早熟品种发病高峰出现在５～６月，病叶率高达１００％。中晚熟品种高峰出现在６～７月，８月中下旬还有一小高峰，病叶率最高达６８％。湿度是此病害流行的关键因素，保护地设施内昼夜平均湿度大于８０％，有利于该病害的发生。温度对该病源菌潜育期影响较大，潜育期最适温度２０～２５℃。

The tomato leafmold pathogen survived the winter ad hyphal body on diseasedplant debris or hypha wthin seeds, and served as the major primary infection source in the next year. The attack peak on early cultivars appeared from May to June and the diseased leaf rate was100%.The attack peak on middle and late cultivars appeared from June to July,and a secondaryattack peak appeared in late August;the diseased leaf rate was68%.Humidity was the key factorfor epiphytotics of the disease.It was favourable for the disease epidemic in plastic shed when themean RH of day and night was over 80% Temperature affected the incubation period of the pathogen; the most suitable temperature was 20～25℃