摘要
用胨-PCNB-四环素选择性培养基涂布平板法检测了关中灌区麦田土壤中禾谷镰孢接种体数量。结果表明,除多年休闲的麦田外,前作物为水稻、玉米、大豆、首蓿、蔬菜的麦田都带有禾谷镰孢,接种体密度幅度为每克土壤58～2800个;在表土中以5cm深处土壤带菌密度最高,禾谷镰孢在麦田土壤中可形成厚垣孢子;麦田土壤中还含有大量带菌细小植物残渣,带菌率1.5％～10％,其密度为每亩(0.31～7.67)×10~4个。
Soil inoculum population of Fusarium graminearum was investigated in the irrigated area of Central Shaanxi Province using peptone-PCNB tetracyclin selective medium and soil-spreading plate technique. The pathogen was found in all the soil samples from the arid wheat fields with the previous crops including rice, corn, soybean, alfalfa and vegetable crops except the long-term wheat fallow fields. Population density of the pathogen ranged 58-2800 propagules/'g of dry weight soil. Propagules of the pathogen with the highest density existed in top soil at the depth of 5 cm. Macroconidia of F. graminearum added to nonsterile soil converted to thick-wall chlamydospores. The pathogen was also recovered from the fine pieces of plant debris and organic manure, with the rate of 1.5% to 10%, and the density ranged (0.31-7.67)×104/mu.
出处
《西北农业大学学报》
CSCD
1991年第2期32-37,共6页
Journal of Northwest Sci-Tech University of Agriculture and Forestry（Natural Science Edition)
关键词
小麦
禾谷镰孢
土壤
赤霉病
wheat disase, Fusearium graminearum, fungus in soil
