西瓜枯萎病病原菌鉴定及药剂联合增效作用
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摘要:采用PDA培养基和PD培养基,对西瓜病株病原菌进行分离、培养,经致病性测定,形态学及rDNA-ITS测序,鉴定其致病菌为尖孢镰刀菌(Fusarium oxysporum)。采用菌丝生长速率法测定85%氨基寡糖素和97%咪鲜胺对西瓜尖孢镰孢菌的共毒系数。结果显示,85%氨基寡糖素∶97%咪鲜胺=3∶1时,增效作用最好,共毒系数为167.88,对西瓜枯萎病菌菌丝具有很好的抑制效果。
关键词:西瓜枯萎病菌(Fusarium oxysporum);杀菌剂;联合作用;混配
中图分类号:S436.5 文献标识码:A
文章编号:0439-8114(2019)14-0059-03
Abstract: Pathogen of watermenlon wilt disease was isolated and cultured on PDA and PD, which was indentified was Fusarium oxysporum Schlecht by analysis of morphological characteristics and rDNA-ITS sequence and pathogenic determination. The co-toxicity coefficient of 85% oligosaccharins and 97% prochloraz mixed against Fusarium oxysporum were tested in lab by mycelium growth rate method, respectively. The results showed that synergistic inhibition best when 85% oligosaccharins and 97% prochloraz combinations mixed by 3∶1, co-toxicity coefficient was 167.88, obviously inhibitory against the pathogen.
Key words: Fusarium oxysporum; fungicides; combined action; mixture
西瓜为葫芦科西瓜属植物,其果瓤脆多汁,营养丰富,堪称'瓜中之王“,是世界第五大果品[1]。近年来随着西瓜栽培面积和需求量的不断增加,重茬、抗病品种较少等原因,西瓜土传病害种类增多且日趋加重[2],致使西瓜生产中的问题也日趋凸显,尤以西瓜枯萎病发生较为普遍。目前防治西瓜枯萎病尚无特别有效的药剂。于2016”2017年,在海南陵水润达设施西瓜基地发现西瓜萎蔫死苗现象,为明确该病的病原菌,本研究对引起该萎蔫死苗病害的病原菌进行了分离、鉴定和药剂防治。
本试验防治药剂选择氨基寡糖素和咪鲜胺。氨基寡糖素是从海洋甲壳类动物外壳中提取...
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