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烟草青枯病是四川烟草上的重要病害,主要分布在川东南海拔1000 m以下的烤烟区,7~8月为发病盛期,高温多雨病害严重,干旱可抑制病害的发生。对四川各地烟草青枯病的19个分离菌进行了形态、染色、培养性状、生理生化等方面的研究,鉴定出两种生化型,即生化型III、IV。生化型III占73.7%。各生化型的分布不受地理条件限制。致病性测定结果表明各地的分离菌均为生理小种1号。烤烟品种云97、云98、RG11和RG17较抗病,红大、云85、云87较感病。
Tobacco bacterial wilt is an important disease in Sichuan tobacco. It is mainly distributed in the tobacco flue-cured tobacco area below 1000 m in southeast of Sichuan Province. During the period from July to August, the tobacco wilt is severe, and the diseases with high temperature and rain are serious, and the drought can restrain the occurrence of the disease. Nineteen isolates of tobacco bacterial wilt in Sichuan Province were studied in morphological, staining, culture traits, physiological and biochemical aspects, and two biochemical types, namely biochemical type III and IV, were identified. Biochemical III accounted for 73.7%. The biochemical distribution is not subject to geographical constraints. The results of pathogenicity test showed that all isolates were all physiological race 1. Flue-cured tobacco varieties Cloud 97, Cloud 98, RG11 and RG17 were more resistant to disease than Red, Cloud 85 and Cloud 87.