玉米弯孢霉叶斑病菌生物学特性的研究

Biological character studies on curvularia lunata

玉米弯孢霉叶斑病菌生长的温度范围是 9～ 38℃ ,p H值为 3～ 1 0 ,最适温度为 30℃ ,最适p H为 7;孢子产生的温度是 1 5～ 38℃ ,最适温度为 30℃ ,相对湿度为 98%以上。分生孢子萌发的温度为 7～ 41℃ ,p H值为 3～ 1 0 ,最适温度为 30～ 32℃ ,最适 p H为 6。孢子萌发不需要补充营养 ,饱和湿度下萌发率只有 7% ,而在水滴中可达 95%以上。光线对孢子萌发有抑制作用。以果糖作碳源 ,以甘氨酸作氮源菌丝生长最佳。以可溶性淀粉作碳源 ,以酪氨酸作氮源产孢最多。紫外光对孢子有杀伤作用 ,1 2 50 ppm的百菌清或 833ppm的福美双可完全抑制孢子萌发。菌丝体及孢子的致死温度分别为 52℃和 55℃。自然条件下 ,病菌孢子 3个月 ,病叶内菌丝体 1

The results showed that the growth optimum temperature of Curvularia Lunata was 30℃,the optimum,pH was 7. The relative humidity of producing conidia was over 98%. The germination optimum temperature of conidia was 30～32℃,the pH was 6. Ultravioled ray could kill the conidias .The lethal temperature of mycelial and conidia were 52℃ and 55℃ . The mycelial in the disease leaf could live for 12 months.