魔芋根腐病和叶斑病的防治药剂筛选

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中图分类号：S632.3 文献标志码：A 文章编号：1673-2871（2025）10-208-05

Screening of fungicides for the control of konjac root rot and leaf spot diseases

ZHAO Qinghua12， WANG Ming'an³， ZHAO Qinging4， ZHANG Yuxi5， ZHOU Jie'， WU Jinping' （1.KeyLaboratoryfologicalCultivationonlpineVegetablesinstrfAricultueandRuralAfis/ubeiKeyLboyof VegetableGermplasmEnancementndGeneticImprovement/IstituteofEconomicCropsHubeiAcademyofAgriculturalciences Wuhan43006Hubea;eflturalenesofsudoutoourecturesh beiChina;3FgianVeeableiceeteganHuben;4lgoicuredFest HuazhongAicualUityni;5leoicuedstuetzi Jingzhou434023，Hubei，China）

Abstract：This study aimed to screen highlyefectivefungicides thatcan simultaneouslycontrol konjacroot rot and leaf spotdiseases，soas toprovideascientificbasis forthepreventionandcontrolofkonjacfielddiseases.Through indoorantibacterial tests，the inhibition rates and toxicities EC50 of six agents， namely 95% difenoconazole， 98% kasugamycin， （204号 98% carbendazim， 97% kresoxim - methyl， 97% iprodione， and 97% hymexazol， against the pathogen of konjac root rot （Fusarium solani）and the pathogenof leaf spot disease（Alternaria tenuissima）were determined.Theresults showed that theinhibitoryeffectsofiprodioneanddifenoconazoleonthetwopathogens werebeterthanthoseofotheragents.Forthe root rot pathogen， the EC50 of iprodione was 24.27μg⋅mL-1 ，and the inhibition rate reached 56.78% at a concentration of 32μg⋅mL-1 ;the EC50 of difenoconazole was 55.92μg⋅mL-1 ，andtheinhibitionratewasalso 74.86% at 320μg⋅mL-1 .For the leaf spot pathogen， the EC50 of difenoconazole was as low as 0.08μg⋅mL-1 ，and the inhibition ratewas 71.67% ata concentration of 81μg⋅mL-1 ; the EC50 of iprodione was 1.81μg⋅mL-1 ，and the inhibition rate reached 69.83% at 8μg⋅mL-1 ： Inconclusion，iprodioneand difenoconazole have strong inhibitoryactivities againstthepathogens of konjacrootrotand leaf spotdiseases and can be considered as candidates for field-appied fungicides for concurrent prevention.However， further verification of their registration compliance and actual field control effects is required.

Keywords：Konjac;Root rot disease; Leaf spot disease; Screening of fungicides

魔芋（AmorphophalluskonjacKoch.）是我国南方重要的经济作物，其富含的葡甘聚糖在食品、医药及工业领域具有不可替代的价值，被联合国卫生组织列为十大保健食品之一[-2]。（剩余6170字）