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通过对河西灌区甜菜(Beta vulgaris L.)黑腐病(Sugar Beet Black Rot)为期3 a的研究,探讨了甜菜栽培品种与病害发病率及病原菌黑腐丝囊霉(Aphanomyces cochlioides)分离频率的关系以及3种环境因子即温度、pH值、不同天然培养基与甜菜黑腐丝囊霉的关系。结果表明:各栽培品种在田间的发病率与室内病原分离频率不同,其中工农2号田间发病率为1.3％,室内分离频率为93％,工农5号分别为1％和7.2％,宁甜301分别为2％和6.1％,工农2号具有更大的耐病性;甜菜黑腐丝囊霉的生长温度范围为5～30℃,最适温度为25～27℃,对高温敏感,33℃为其致死温度;甜菜黑腐丝囊霉可在pH 3.5～11范围内生长,最适pH为5～9.9;甜菜黑腐丝囊霉在PDA、玉米粉琼脂、甜菜汁、麦芽糖-胨、麦芽糖酵母汁及燕麦琼脂培养基上均可生长,其中在甜菜汁培养基上生长最好.图4表3参11
By studying the sugar beet black rot (Beta vulgaris L.) in Hexi Irrigation Region for a period of 3 years, the relationship between the sugarbeet cultivars and disease incidence and the frequency of separation of the pathogen Aphanomyces cochlioides was discussed And three kinds of environmental factors, namely, temperature, pH value, different natural media and sugar beetle Neisseria meningitidis relations. The results showed that the incidence of each cultivars in the field was different from that of indoor pathogens, among which the incidence rate of workers and peasants was 1.3%, the indoor separation frequency was 93%, workers and peasants 5 were 1% and 7.2% Respectively, 2% and 6.1% respectively, while that of worker and peasant 2 was more tolerant. The growth temperature range of Spinachia beetle was 5 ~ 30 ℃, the optimum temperature was 25 ~ 27 ℃, the temperature was 33 ℃ And the lethal temperature. The Sacchromyces beetle could grow within the pH range of 3.5-11, the optimum pH was 5-9.9. The beetle was cultured on PDA, corn flour agar, beet juice, maltose-peptone, maltose yeast Juice and oat agar medium can grow, which grew best in beet juice medium Figure 4 Table 3 Senate 11