四季豆枯萎病病原鉴定及防治

THE PATHOGEN AND CONTROL OF KIDNEY BEAN WILT DISEASE

从南宁市郊11个病区采集的四季豆枯萎病株标样,经分离培养鉴定和致病性测定,证明其病原菌为尖孢镰刀菌菜豆专化型(Fusarium oxysporum f.sp.phaseoli Kend & Syd)。此病在南宁于4月上中旬四季豆初花期开始发生,5月中下旬盛花至结荚期为发病高峰期。用滤纸碟法进行药效试验的结果,40%灭病威300—500倍液的抑菌圈最大,田间灌根防治也有一定效果。可用种子重量的0.5%多菌灵可湿性粉拌种。品种间抗病性有显著差异,秋抗19号和秋抗6号较抗病。

The fungi isolates from plants of bean wilt disease were collectedin Nanning suburbs.They are proved to be Fusarium oxysporum f.sp.phaseoli in accordance with their culture characters,morphology andpathogenicity.The result from experiments of fungicides by filter paper platesmethod demonstrated that the 40% Mie-Bing-Wei(300-500×)gavethe largest inhibition zones in the fungi culture plates.Pour soil treat-ment with this fungicide showed a certain control effect.Seed treat-ment with 0.5% Bavistin WP was also effective.The resistance towilt among varieties is quite different,but Qiu Kang 19 and QiuKang 6 are the more resistant.