Rhizopus oryzae에 의한 산딸기 무름병

Abstract

Soft rot disease on Raspberry (Rubus crataegifolius Bunge) was observed in sale boxes at Jinju City Wholesale Market of Agricultural Products in June 2010. The infected fruits were rapidly water-soaked,softened, black and eventually rotted. The colonies on the infected fruits were white to light brown, formed numerous sporangiospores. Optimum temperature for the mycelial growth of the causal fungus on PDA was 30℃ and growth was still apparent at 37℃. Sporangia were globose, white at early and gradually to black,and 40-210 μm in diameter. Sporangiophores were white to mid brown as maturation and 8-20 μm in diameter. Columella were globose to sub-globose, and the size of the diameter was 85-120 μm in diameter. Sporangiospores were sub-globose, rhomboidal and irregular, streaked and 5-10 μm in length. On the basis of symptom, mycological characteristics, ITS rDNA sequence analysis, and pathogenicity of the fungus, the causal fungus was clearly identified as Rhizopus oryzae Went & Prinsen Geerligs. This is the first report of soft rot by R. oryzae on R. crataegifolius in Korea.