杀菌剂对毛壳核腔菌的抑制效果

Inhibition of Fungicides to Pyrenophora chaetomioides

毛壳核腔菌[Pyrenophora chaetomioides(synonym:Drechslera avenae)]是一种广泛分布于世界各燕麦产区的病原真菌,可为害燕麦的叶片和小穗,降低燕麦产量和饲草品质。采用含药平板法测定了8种杀菌剂(15%三唑酮可湿性粉剂、75%百菌清可湿性粉剂、50%多菌灵可湿性粉剂、70%代森锰锌可湿性粉剂、50%速克灵可湿性粉剂、10%苯醚甲环唑水分散粒剂、430 g/L戊唑醇悬浮剂和400 g/L氟硅唑乳油)对毛壳核腔菌(菌株ASA-11和ASA-13)的抑菌效果。结果表明,在试验浓度下,8种供试杀菌剂对毛壳核腔菌菌丝生长均具有不同程度的抑制效果,其中70%代森锰锌可湿性粉剂500倍液,10%苯醚甲环唑水分散粒剂1000倍液、5000倍液和400 g/L氟硅唑乳油5000倍液、10000倍液的抑菌效果最好,均达100%;50%多菌灵可湿性粉剂500倍液的抑菌效果最差,仅为40.77%。

Pyrenophora chaetomioides(synonym:Drechslera avenae)is a cosmopolitan pathogen of Avena spp.,and infects leaves and spikelets,reducing grain yield and forage quality.Fungicide sensitivity of P.chaetomioides isolates(ASA-11 and ASA-13)was assessed by amendment plate method:autoclaved PDA media were amended prior to pouring with 8 different fungicides(triadimefon 15%WP,chlorothalonil 75%WP,carbendazim 50%WP,mancozeb 70%WP,procymidone 50%WP,difenoconazole 10%WDG,tebuconazole 430 g/L SC and flusilazole 400 g/L EC).The results showed that under test concentrations,all eight fungicides could inhibit the mycelial growth of P.chaetomioides,of which mancozeb 70%WP(500 times),difenoconazole 10%WDG(1000 times,5000 times)and flusilazole 400 g/L EC(5000 times,10000 times),inhibitory effects were up to 100%;carbendazim 50%WP(500 times)exhibited the worst inhibitory effect,only to 40.77%.