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一、西瓜枯萎病西瓜枯萎病是由尖孢镰刀菌西瓜专化型引起的土传病害,厚垣孢子在土壤中存活10年以上,离开寄主也能存活5~6年,在长期种植的情况下,病原菌大量累积,致使防治困难。大棚栽培面积不断扩大,连作易导致西瓜枯萎病的大量发生,而轮作既费工费力又受土地面积限制,因而该病已成为西瓜生产的主要限制因素之一。1、症状识别西瓜整个生育期均可发病,主要危害瓜蔓和根部。幼苗受害即腐烂而不能出土。出苗后发病,顶端呈失水状,子叶和
First, the watermelon fusarium wilt Fusarium oxysporum Fusarium oxysporum is caused by the specialized soil-borne diseases, chlamydospores in the soil more than 10 years of survival, leaving the host can survive 5 to 6 years in the case of long-term planting Under the large accumulation of pathogens, resulting in prevention and treatment difficulties. Growing area of greenhouses continues to expand, continuous cropping easily lead to a large number of watermelon Fusarium wilt occurs, and crop rotation is both laborious and land area constraints, so the disease has become one of the main limiting factors in watermelon production. 1, symptoms Identification Watermelon can be the disease throughout the reproductive period, the main damage melon and roots. Seedlings that rot that can not be unearthed. Emergence after onset, the top was dehydrated, cotyledons and