Mating Type and Effective Control of Phytophthora colocasiae in Fujian
[Objective]Mating type and fungicides for effective control of Phytophthora colocasiae that caused 2020 taro blight epidemic in Fujian were determined.[Method]Specimens of diseased taro tissues were collect from the 4 blight-infected regions in Fujian to isolate and identify the pathogen.Based on the morphology,pathogenicity,and sequence homology of ITS-LSU-Ypt1,the pathogenic strains were identified to be of P.colocasiae.Subsequently,mating type and sensitivity to 6 fungicides of the isolates were determined in the laboratory.[Result]In total,125 strains were isolated and identified to have caused the epidemic.Out of them,122 belonged to the A2 mating type and 3 the A1A2 type.The laboratory toxicity test of 6 fungicides on the isolates showed 98%metalaxyl to be the strongest with EC50 of(0.146±0.032)μg·mL-1,while the EC50 of 95%dimethomorph,98%fluopicolide,and 94%cyazofamid ranged from(0.239±0.011)μg·mL-1 to(0.713±0.088)μg·mL-1 and that of 95%azoxystrobin at(23.447±3.666)μg·mL-1.[Conclusion]The dominant strains of P.colocasiae that caused the taro blight in Fujian in 2020 were of the A2 mating type and could be best controlled by using 98%metalaxyl,95%dimethomorph,98%fluopicolide,or 94%cyazofamid.
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