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1977～1987年采集103个稻恶苗病标本,分离后获8种镰刀菌。其中串珠镰孢(Fusarium moniliforme)的一个变种占总标本数的60.2%,其特征为:菌落生长直径2—4cm;大型分生孢子镰刀形,3—5隔;小型分生孢子卵形,串生和假头生;产孢细胞单、复粳并存;具厚垣孢子,球至亚球形。此变种定名为(F. moniliforme var. Zhejiangensis Wang et Chen var. nov.)。其他7种镰刀菌为木贼镰孢(F. equiseti),禾谷镰孢(F. graminearum),砖红镰孢(F. lateritium),雪腐镰孢(F. nivale),尖镰孢(F. oxysporum),半裸镰孢(F. semitectum),腐皮镰孢(F. solani)。试验证明,串珠镰孢浙江变种是水稻恶苗病的主要致病菌;其他6种(除腐皮镰孢未接种外)均有不同程度的弱致病性。串珠镰孢浙江变种也能侵染小小麦、大麦、玉米、西瓜、豌豆等作物的幼苗,并有徒长症状。
From 1977 to 1987, 103 samples of rice stump disease were collected and 8 kinds of Fusarium were isolated. One species of Fusarium moniliforme accounted for 60.2% of the total number of specimens, which was characterized by colony growth 2-4cm in diameter, large conidiophores sickle-shaped, 3-5-septate, small conidiophores, Health and false head students; spore cell single, complex japonica co-exist; with chlamydospores, ball to sub-spherical. This variant is named (F. moniliforme var. Zhejiangensis Wang et Chen var. Nov.). The other seven Fusarium species are F. equiseti, F. graminearum, F. lateritium, F. nivale, Fusarium oxysporum F. oxysporum, F. semitectum, F. solani. Tests show that Fusarium moniliforme Zhejiang variant is the main pathogen of rice Bakanae disease; the other six species (except Fusarium non-inoculated) have different degrees of weak pathogenicity. Fusarium moniliforme Zhejiang variants can also infect small wheat, barley, corn, watermelon, pea and other crops seedlings, and leggy symptoms.