摘要
壶瓶枣Ziziphus jujubaMill褐斑病为近年来山西发生的一种严重的壶瓶枣果实病害,症状表现为果顶或果肩部位形成红褐色病斑,经鉴定,病原为有丝分裂孢子真菌链格孢菌Alternaria alter-nata(Fries)Keissler。采用生长速率抑制法和悬滴法分别测定了9种杀菌剂对该病菌的菌丝生长和孢子萌发的抑制作用,并测定了其中4种杀菌剂对该病菌的毒力。结果表明,代森锰锌、异菌脲、多菌灵、剑斑和施力科对病菌菌丝生长抑制作用较强,抑菌率均在90%以上;炭阻绝、代森锰锌、多菌灵、剑斑和施力科对病菌孢子萌发抑制活性比较强,抑菌率也在90%以上。毒力测定结果表明,施力科、多菌灵、剑斑和代森锰锌的有效中浓度(EC50)分别为14.45,20.83,28.47,149.93 mg/L,其中施力科的有效中浓度最低,相对抑制效果最好。4种药剂的相关系数均在0.93以上,表明药剂浓度与抑制作用呈现较高的正相关。
Brown spot of Hupingzao was a serious fruit disease in Shanxi Province. The typical symptom was the brownish spots occurred on the top or shoulder parts of jujube fruits. The pathogen of this disease was identified as Alternaria alternata （Fries） Keissler with karyokinesis spores. The in vitro inhibition of mycelium growth and spore germination caused by 9 fungicides against pathogen was tested by means of mycelium growth rate method and hang drop method. The results indicated that Mancozeb, Iprodion, Carbendazim, Jianban and Propiconazole could significantly inhibit mycelium growth with the inhibition rates over 90% and Tanzujue, Mancozeb, Carbendazim,Jianban and Propiconazole could greatly depress spore germination with inhibition rates over 90% as well. Results of toxicity test showed that ECs0 of Propiconazole, Carbendazim, Jianban and Mancozeb was 14. 45,20. 83,28. 47 and 149. 93 mg/L respectively and Propiconazole was the best. The correlation coefficients of four fungicides were all above 0. 93,indicating a highly positive correlation between fungicide concentration and its inhibition ability.
出处
《中国森林病虫》
北大核心
2009年第4期27-29,共3页
Forest Pest and Disease
基金
教育部科学技术研究重点项目(NO.208017)
河北农业大学科研基金
关键词
褐斑病
链格孢菌
杀菌剂
毒力测定
brown spot of jujube
Alternaria alternata
fungicide
toxicity test
