采集国内主要甜菜种植区的甜菜褐斑病菌标样,在50余个甜菜品种上进行异地接种鉴定,结合室内离体叶接种和盆栽隔离接种鉴定,并在内蒙通辽、黑龙江呼兰进行自然诱发观察,结果表明,甜菜褐斑病菌的变异较小,仅存在致病力有差异的生理型,尚不存在明显的生理分化现象。本试验提出利用病情指数、产孢量、酯酶同工酶E_5酶带可试作为甜菜褐斑病菌品种抗性接种鉴定的指标。 The samples of brown sugarbeet brown spot in the main sugar beet growing areas in China were collected and identified in more than 50 beet varieties. The in vitro leaf inoculation and pot isolation inoculation were carried out. The natural induced observation was conducted in Hulan, Heilongjiang Province The results showed that there were only slight variation in pathogenicity of Alternaria brassicae, but no obvious physiological differentiation. In this study, the index of disease resistance, sporulation and esterase isoenzyme E_5 were used as indicators of resistance inoculation of brown sugar beet disease.