抄録
Glomerella cingulata (Stoneman) Spaulding et Schrenk (anamorph: Colletotrichum gloeosporioides (Penzig) Penzig et Saccardo) has been known as the pathogen of ripe rot of grapevine (Vitis vinifera L.). In addition to this fungus, another Colletotrichum species was isolated from fruits of grape cultivar ‘Sekirei’ with ripe rot in Shimane Prefecture in 1994. Colonies of the isolate on potato dextrose agar (PDA) were reddish to pale brown. Its conidia on PDA were one-celled, hyaline, ellipsoid to fusiform with acute ends and 12-17×4-5μm. Appressoria formed on potato carrot agar were pale grayish brown, ellipsoid, rarely irregular in shape, and 8-11×4-7μm. The isolate grew slower than that of G. cingulata isolates from grape fruits on PDA at the optimum temperature. These morphological and physiological characteristics agreed with those of Colletotrichum acutatum Simmonds ex Simmonds. The ripe rot symptom was reproduced on grapevine fruits after inoculation with the isolate of C. acutatum. These results lead us to propose that C. acutatum, as well as G. cingulata, causes ripe rot of grapevine.
