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千叶县是日本有名的大葱产地,全年都有栽培,但各种作型均有锈病发生。年度间发病差异很大。我们对锈病的发病条件,肥料、品种与发病的关系等进行了试验,对药剂的作用也进行了研究。一、温、湿度与发病的关系大葱锈病主要在春(3～7月)、秋(9～11月)发生,其主要感染源是夏孢子,发芽适温为9～18℃,24℃以上很少发芽。感染时16～20℃,有利发病,25℃只有少数发病。接种的结果是15～20℃为最适温。发病最适湿度为100％,95％时发病减少。
Chiba Prefecture is a famous Japanese green onion origin, cultivated throughout the year, but a variety of forms have rust. Significant differences between the annual incidence. We conducted tests on the condition of the rust, the relationship between fertilizers, varieties and pathogenesis, and also studied the effects of the agents. First, the relationship between temperature, humidity and incidence Scallion rust was mainly in the spring (March to July), autumn (September to November) occurred, the main source of infection is the summer spores, germination temperature is 9 ~ 18 ℃, 24 ℃ above Few germinate. 16 ~ 20 ℃ infection, favorable incidence, 25 ℃ only a few incidence. Inoculation results is 15 ~ 20 ℃ for the optimum temperature. The optimum incidence of humidity was 100%, 95% incidence decreased.