Impact of resistant melon cultivars on Sphaerotheca fuliginea

Citation
K. Hosoya et al., Impact of resistant melon cultivars on Sphaerotheca fuliginea, PLANT BREED, 119(3), 2000, pp. 286-288
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
PLANT BREEDING
ISSN journal
0179-9541 → ACNP
Volume
119
Issue
3
Year of publication
2000
Pages
286 - 288
Database
ISI
SICI code
0179-9541(200006)119:3<286:IORMCO>2.0.ZU;2-B
Abstract
Effects of the resistant cultivars of melon on the powdery mildew fungus, S phaerotheca fuliginea, were investigated in a melon-growing area of Japan. Powdery mildew fungi were isolated from four melon cultivars ('HN21','Quinc y', 'Earl's Knight Natsu 2' and 'Earl's Miyabi Natsu 2') which are resistan t to different races of S. fuliginea. 'HN21 is resistant to races 1 and N1, 'Quincy' and 'Earl's Knight Natsu 2' are resistant to races 1 and N2, and 'Earl's Miyabi Natsu 2' is resistant to races 1, N1 and N2. All 155 strains isolated from 'HN21' were identified as race N2. Seventy out of 81 strains isolated from 'Quincy' and 'Earl's Knight Natsu 2' were identified as race N1, while other strains were identified as races 1, 2US, N2 and N3. Ninete en out of 29 strains isolated from 'Earl's Miyabi Natsu 2' were identified as race N3, while other strains were identified as races 1, 2US, N1 and N4. These results suggest that, although the resistant cultivars are extremely effective for protecting the plants from their respective races, a race su ccession rapidly takes place, even in a small area, and other minor races b ecome predominant.