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本研究探究注射法、针刺法和喷雾法接种西瓜叶片瓜类果斑病,观察西瓜叶片感病情况。结果表明,3种接种方法均能使西瓜叶片感病,但发病时间和症状有所不同,注射法接种发病早,症状偏重,针刺法和喷雾法相似,发病晚且比注射法接种症状轻。通过田间观察,发现果斑病的扩展蔓延与气温和降水有密切关系,低温高湿有利于果斑病的扩展蔓延,发病的适宜温度在25.0~28.0℃,相对湿度在70%以上,发病的时间约为8~10 d。
In this study, inoculation of watermelon melons and fruit leaf spot by injection, acupuncture and spraying methods were explored, and the susceptibility of watermelon leaves was observed. The results showed that all the three inoculation methods could make watermelon leaves susceptible, but the onset time and symptoms were different. The incidence of injection was earlier and the symptoms were more serious. The acupuncture and spraying methods were similar. . Through the field observation, it was found that the spread of fruit leaf spot was closely related to temperature and precipitation. Low temperature and high humidity were conducive to the expansion and spread of fruit leaf spot. The optimum temperature for pathogenesis was 25.0-28.0 ℃ and the relative humidity was above 70% The time is about 8 ~ 10 d.