黄瓜霜霉病菌不同发育阶段对烯肟菌酯的敏感性

摘 要：本研究以专性寄生菌黄瓜霜霉病菌为靶标菌，测定了该病原菌不同发育阶段对烯肟菌酯的敏感性。研究结果表明，烯肟菌酯对黄瓜霜霉病菌休止孢的萌发没有影响，对黄瓜霜霉病菌游动孢子释放、游动孢子游动、芽管伸长、菌丝扩展、孢囊梗形成及孢子囊产生均有抑制作用，而且对黄瓜霜霉病菌的孢子囊释放、游动孢子游动和芽管伸长有显著的抑制作用。其中对黄瓜霜霉病菌的孢子囊释放和芽管伸长EC50值分别为0.0239μg/ml和0.0037μg/ml；并且当烯肟菌酯浓度为0.05µg/ml时能使游动孢子消解，抑制休止孢的形成；当药剂浓度为5μg/ml时，对病斑的扩展和孢子囊产生抑制率分别达到60.41%和92.10%，且对孢子梗的产生也有显著的抑制作用。

Sensitivity of Pseudoperonospora cubensis at Different Development Stages to Enostrobilurin

Abstract: The effects of enostrobilurin to the different development stages in the life cycle of P. cubensis was studied. The results showed that enostrobilurin had no effect on cystospore germination, but prevented the zoospore dischargement, zoospore motility, germ tube elongation, hypha growth , sporangiophore emergency from stomata and sporangial formation. The EC50 of enostrobilurin to zoospore dischargement and germ tube elongation were 0.0239μg/ml, 0.0037μg/ml, respectively. enostrobilurin made zoospore cleaned up at 0.05µg/ml and inhibited hypha, growth sporangiophore emergency from stomata and sporangial formation obviously at 5μg/ml.