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作 者:黄世文[1] 余柳青[2] 段桂芳[2] 罗宽[1]
机构地区:[1]湖南农业大学,长沙410128 [2]中国水稻研究所,杭州310006
出 处:《植物病理学报》2005年第1期66-72,共7页Acta Phytopathologica Sinica
基 金:国家自然科学基金资助项目(30070505);浙江省重点资助项目(011102469)
摘 要:病原真菌禾长蠕孢菌稗草专化型 (HelminthosporiumgramineumRabenhf. sp. echinochloae, HGE)和尖角突脐孢菌(Exserohilummonoceras,EM)在稗汁葡萄糖中的发酵滤液对稗草种子的发芽有明显的抑制效果,发芽抑制率分别为 30. 9%和 13 5%。HGE菌在改良Fries、稗汁葡萄糖,EM菌在改良Fries中的发酵滤液对稗草根和芽的生长有明显抑制作用。HGE菌发酵滤液与其孢子混合使用比单独使用对稗草的防效明显提高,稗草感病株率、致死率分别达 86 3%和 69 5%,病情指数为 78 7;发酵滤液与孢子结合 (先后喷雾 )使用后稗草的感病株率、致死率分别为 83 9%和 67 9%,病情指数为72 8。HGE与弯孢菌(Curvularialunata)孢子混合喷雾接种对稗草防效明显高于 2种菌孢子单独使用。The fermentation filtrate (FF) in barnyardgrass decoction dextrose liquid (BDDL) of barnyardgrass pathogenic fungi Helminthosporium gramineum Rabenh f. sp. echinochloae (HGE) and Exserohilum monoceras (EM) showed significantly inhibiting effect to the barnyardgrass seeds germination. The FF of HGE in both of modified Fries liquid (MFL) and BDDL,and the FF of EM in MFL give higher efficacy to inhibit growth of the roots and shoots of barnyardgrass. Mixture of HGE conidia and its FF showed higher efficacy to control barnyardgrass than that of each alone in applying. The percentage of infected,mortality and di- sease index of barnyardgrass seedlings were 86.3%,69.5% and 78.7,respectively. Application of FF combination with HGE conidia (spraying one after another) also gave higher efficacy to barnyardgrass,the percen- tage of infected,mortality and disease index were 83.9%,67.9% and 72.8,respectively. Control efficacy to barnyardgrass of mixture spraying of HGE and Curvularia lunata spores is better than that of alone using.
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