Race identification in powdery mildew (Sphaerotheca fuliginea) on melon (Cucumis melo) in Japan

Hosoya, K Narisawa, K Pitrat, M Ezura, H

K. Hosoya et al., Race identification in powdery mildew (Sphaerotheca fuliginea) on melon (Cucumis melo) in Japan, PLANT BREED, 118(3), 1999, pp. 259-262

14

INGLESE

Article

Plant Sciences

PLANT BREEDING

0179-9541 → ACNP

118

3

1999

259 - 262

ISI

0179-9541(199907)118:3<259:RIIPM(>2.0.ZU;2-C

Powdery mildew fungi isolated from single lesions on leaves of susceptible melon genotypes during semi-forcing and late-raising cultivation in Japan w ere tested. All 80 of the isolated strains were identified as Sphaerotheca fuliginca. The dominant fungus races found during semiforcing cultivation w ere race 5 in March (100%) and race 1 in May (100%), and race 1 (80%) durin g late-raising cultivation. Although the frequencies were quite low (13% in late August, but no isolation earlier in the season), two new races of S. fuliginea, which could not be identified by the differential genotypes, app eared during late-raising cultivation. These results suggest that the resis tance gene to races 1 and 5 of S. fuliginea should be introduced into the b reeding materials in Japan.