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目的:明确甘肃省当归褐斑病发生规律和筛选出高效低毒的杀菌剂用于田间防治。方法:采用田间定点定期系统调查的方法,同时用温湿度记录仪记录田间小气候温湿度,并选用了5种杀菌剂进行了田间药效试验。结果:8月初至9月初是褐斑病的盛发期,9月中旬以后为衰退期,通过对田间小气候温度、湿度、病情基数等因子分析,发现褐斑病的病情指数与病情基数、日平均相对湿度呈显著的正相关。5种供试杀菌剂中,70%安泰生WP200~400倍液、10%苯醚甲环唑WG 600~800倍液和70%甲基硫菌灵WP 600倍液是较理想的药剂,间隔7天连续用药2次后,防效均达71%以上。结论:当归生产中可采用摘除病叶、调控田间温湿度和交替使用杀菌剂等措施来防治当归褐斑病。
Objective: To clarify the occurrence of Angelica spot disease in Gansu Province and to screen out a high efficiency and low toxicity fungicide for field control. Methods: The method of periodic systematic investigation in field was used. The temperature and humidity of field microclimate were recorded by temperature and humidity logger, and five kinds of fungicides were selected for field efficacy test. Results: From early August to early September, it was the blooming stage of brown spot and the recession after mid-September. By analyzing the factors such as the temperature, humidity and the base of disease in the field, it was found that the disease index and disease base, The average relative humidity showed a significant positive correlation. Among the five tested fungicides, WP200 ~ 400 times of 70% Aetna and WP 600 ~ 800 times of 10% difenoconazole WG and 70% of thiophanate-methyl WP 600 times are the ideal medicament, the interval After 7 days of continuous medication 2 times, the control effect reached more than 71%. Conclusion: The removal of diseased leaves, the regulation of temperature and humidity in the field and the alternate use of fungicides can be used to control the leaf spot of Angelica keiskei in the production of Angelica sinensis.