苹果炭疽病菌对多菌灵抗药性研究

利用抑菌圈法和果实接种法测定了河南各苹果产区苹果炭疽病菌对多菌灵的敏感性.结果表明,连续用药3年以上的炭疽病菌株对多菌灵产生严重的抗药性,其他依次为农-4<许-3<泛-9.用药3年以上的炭疽病菌抗性菌株对甲基托布津具有交互抗性.初步观察,混配药剂花麦特(50%多菌灵+50%退菌特+50%扑海因+70%代森锰锌)对抗性和敏感性菌株有显著效果,可作为替换药剂.

Strains of Glomerella cingulata,Causing Apple Anthracnose,Resistant to Carbendazim in Henan

Sensitivity of the anthracnose pathogen(Colletotrichum gloeosporioides Penz.)to Car-bendazim was determined by growth inhibitory zone test and fruit inoculation test in 1991—1992 in Henan province.The results indicated that the strains of the pathogen in the areas us-ing Carbendazim for more than 3 years were resistant to Carbendazim severely and the 4strains,in order of increasing tolerance,were Meng—5,Nong—4,Xu—3 and Fan—9.Cross—tolerance was showed between Carbendazim and Thiophanate—methyl.The mixed compound(Carbendazim+Thiram+Iprodione+Mancozeb)could inhibited the growth of the sensitivestrains and the tolerant strains and could be used in stead of Carbendazim to control the dis-ease.