以玉米青枯病病株进行组织分离,所得的分离物中以镰刀菌占绝大多数。用串珠镰刀菌(Fusarium moniliforme)菌株BF-2、MF-3,和同色镰刀菌(Fusarium concolor)茵株BF-1、NF-3进行田间接种,发病率达37.9～64.5%。病株再分离也得到与原接种菌相同的病原物。初步认为能引致玉米表现枯萎症状的镰刀菌不止一种,但在广西则以串珠镰刀菌为其主要病原。试验证明,病株种子、病残体及病田土壤都可成为玉米青枯病的初次侵染来源,带病种子还是远距离传播的途径。致病菌只有在玉米生长衰弱时才能致病。一般多从乳熟期后开始表现症状,从蜡熟期到玉米收获前,发病率一直上升到最高峰。生长健壮的玉米发病轻或不发病。不同玉米品种对青枯病的抗病性差异显著,而且有一定的稳定性。品种的抗病性受栽培水平和环境条件的影响较大,凡是肥水足,玉米生长良好,抗病性强,发病就轻。春玉米早播的发病重,迟播的发病轻。晚玉米比早玉米发病重。玉米播种密度越大,发病越重。选育和推广种植抗病品种,加强栽培管理是防治此病的有效措施。 To corn wilt disease isolates, the resulting isolates to the vast majority of Fusarium. Fusarium moniliforme strains BF-2, MF-3, and Fusarium concolor strains BF-1 and NF-3 were inoculated in the field with the incidence of 37.9-64.5%. Re-isolation of diseased plants also gives the same pathogen as the original inoculum. Initially believed that the symptoms can lead to wilt symptoms of corn Fusarium more than one, but in Fusarium was Guangxi as the main pathogen. Experiments show that diseased plants, diseased plants and sick soil can become the primary source of corn bacterial wilt. The diseased seeds are also the means of long-distance transmission. Pathogens are pathogenic only when corn is growing weak. Mostly from milky maturity began to show symptoms, from waxy to corn before harvest, the incidence has risen to the peak. Healthy growth of corn incidence or no disease. The resistance of different varieties of corn to bacterial wilt was significantly different, and had certain stability. The disease resistance of cultivars is greatly affected by the cultivation level and environmental conditions. All fertilizers, corn, good growth, disease resistance, the incidence of light. Early onset of spring corn incidence, delayed onset of light. Late corn is more severe than early corn. Maize planting density, the more serious the disease. Breeding and promotion of resistant varieties, strengthen the cultivation and management is an effective measure to prevent and treat the disease.