麻疯树白粉病的病原鉴定及药剂防治研究

Research on the Identification of the Pathogen of Jatropha curcas Powdery Mildew and its Chemical Control

[目的]为控制基地麻疯树白粉病的流行提供科学依据。[方法]通过制片镜检对云南省元阳县膏桐良种繁育基地的麻疯树白粉病进行病原鉴定。[结果]麻疯树白粉病病原为白尘粉孢(Oidium leucoconium Desm)。初选了1个杀菌剂组合进行田间药效试验,初步结果表明,该药剂组合能促进植株正常生长发育,防治麻疯树白粉病效果明显,在病害发展较快时,间隔7d连续施药2次,防效高达85.3%;药剂处理有明显的促进生长作用,施用过试验药剂的麻疯树1月份不仅不落叶,枝梢还明显生长,并于3月份结果;且施用该药剂安全无药害。[结论]为麻疯树白粉病的防治提供了一种比较经济和有效的方法。

[ Objective] The scientific basis of the control of Jatropha curcas powdery mildew in production was provided. [ Method ] The pathogen of Jatropha curcas powdery mildew in the multiplication base of Jatropha curcas sapling in Yuanyang county in Yunnan province was identified through the microscope observation. [ Results] The result showed that the pathogen was Oidium leucoconium Desm. The field experiment in the efficiency of a combination of fungicide preliminarily selected showed that the fungicide combination could promote the normal growth of tree and had obvious control effect on Jatropha curcas powdery mildew without the risk of damage to Jatropha curcas. Two applications of the fungicide combination were done at an interval of about 7 days when the disease was rapidly developed and the control effect could reach to 85.3%. The chemical treatment could significantly improve its growth without leaf-falling and with obviously branch-growing in January and fruiting in March. And the fungicide was no chemical damage to the tree. [ Conclusion] The economic and effective approach of the control of the disease was provided.