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采用常规流行学方法研究了白菜黑斑病病斑的产孢量。结果显示,影响白菜黑斑病病斑产孢有许多因素:病斑日龄、保湿时间、光照、温度。病斑在6~9日龄时产孢能力较强。其中,8日龄病斑的产孢能力最强,而1~3日龄病斑产孢能力较弱;保湿时间对于产孢有较大影响。6~8 h时病斑几乎不产孢,14 h后病斑开始大量产孢;在直射光下病斑产孢最多,病斑在黑暗条件下比散射光条件下产孢能力强;白菜黑斑病菌在8~25℃的温度范围内均可产孢,25℃最适合产孢,达到28℃时孢子基本不再产生。
The spore germination of black spot disease in cabbage was studied by the conventional epidemiological method. The results showed that there were many factors that affected the sporulation of the diseased cabbage black spot disease, such as the age of the diseased spot, the moisturizing time, the light and the temperature. Lesions sporulation at 6 to 9 days of age stronger ability. Among them, the 8-day-old spot had the strongest sporulation ability, while the sporulation ability of 1 ~ 3-day-old lesion was weaker; the moisturizing time had a greater impact on sporulation. Lesions rarely sporulated at 6-8 h, and a large number of spores were sporulated after 14 h. Spores were most sporulated under direct light, and their sporulation ability was stronger under diffusive light conditions in dark conditions. Alternaria sp. Can sporulate in the temperature range of 8 ~ 25 ℃, and sporulation at 25 ℃ is the most suitable for sporulation. When spores reach 28 ℃, spores are no longer produced.