摘要
【目的】比较不同杀菌剂对烟草白粉病的室内毒力和田间药效,以筛选出适合于治疗烟草白粉病的杀菌剂。【方法】分别采用孢子萌发法和田间防效试验,研究30%醚菌酯悬浮剂、15%三唑酮可湿性粉剂、50%百菌清可湿性粉剂、50%退菌特可湿性粉剂、25%乙嘧酚悬浮剂和对照药剂70%甲基硫菌灵可湿性粉剂对烟草白粉病的室内毒力及田间防治效果。【结果】室内毒力测定结果和田间药效试验结果表明,30%醚菌酯悬浮剂对烟草白粉病菌孢子萌发的EC50为2.29mg/L,其3 000倍液的防治效果可达84.29%;25%乙嘧酚悬浮剂对烟草白粉病菌孢子萌发的EC50为2.88mg/L,其1 000倍液的防治效果可达81.57%;对照药剂75%甲基硫菌灵可湿性粉剂对烟草白粉病菌孢子萌发的EC50为15.49mg/L,其1 000倍液的防治效果只有31.76%;其他杀菌剂的防治效果均低于醚菌酯和乙嘧酚,但高于对照药剂甲基硫菌灵。【结论】醚菌酯和乙嘧酚均能有效地防治烟草白粉病,且效果优于对照药剂甲基硫菌灵,为生产提供了更高效可供替代的化学药剂品种。
[Objective] The control effects of six fungicides against Erysiphe cichoracearum DC in to- bacco field were tested, to determine the suitable fungicide for the treatment of tobacco mildew fungicide. [Method] Thespore germination method was used to determine the toxicities of kresoxim-methyl,three tri- adimefon, chlorothalonil, tuzet,ethyl-phenol and the control agent thiophonate-methyl to E. cichoracearum DC,and field trials were conducted to ascertain the effects of 30% kresoxim-methyl,15% three triadime- fon,50% chlorothalonil,50% tuzet,25% ethyl-phenol and the control agent （70% thiophonate-methyl） on pathogenicity. [Result] ECs0 of kresoxim-methyl against tobacco powdery mildew conidia germination was 2.29 mg/L,and the control effect of 3 000 times solution reached 84.29%. EC50 of ethyl-phenol against to- bacco powdery mildew conidia germination was 2.88 mg/L,and the control effect of 1 000 times solution reached 81.57%. EC50 of the control reagent （thiophonate-methyl） against tobacco powdery mildew conidia germination was 15.49 mg/L,and the control effect of 1 000 times solution was only 31.76%. Other fungi- cides control effects were lower than kresoxim-methyl and ethyl-phenol, but higher than control drug thiophonate-methyl. [Conclusion] According to the determined pathogen virulence results, kresoxim-methyl and ethyl-phenol can effectively inhibit E. cichoracearum DC.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2014年第2期131-135,141,共6页
Journal of Northwest A&F University(Natural Science Edition)
基金
高等学校学科创新引智计划项目(B07049)
中国烟草有害生物普查项目(KJ-2010-04)
烟草白粉病菌致病力分化及其防治研究(110201002024)
关键词
烟草白粉病菌
毒力测定
田间防效
杀菌剂
Erysiphe cichoracearum DC
toxicity test
field trial
bactericide
