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Root infection by Fusarium oxysporum f.sp. cepae at different growth stages and its relation to the development of onion basal rot.

Stadnik, M. J.; Dhingra, O. D.;

Phytopathologia Mediterranea Year: 1997 Vol: 36 Issue: 1 Pages: 8-11 Ref: 13 ref.

1997

บทคัดย่อ

Root infection by Fusarium oxysporum f.sp. cepae at different growth stages and its relation to the development of onion basal rot.

In greenhouse tests, onion plants, cv. Baia Periforme, were inoculated with F. oxysporum f.sp. cepae at transplanting, 25, 65 or 105 d after transplanting 60-d-old setts. Symptom evaluations were made on the 15th, 45th and 75th days after transplanting. Only plants inoculated at transplanting showed yellowing and stunting up to 45 d. Plants inoculated at later stages exhibited normal growth without any apparent disease symptoms. However, the fungus was recovered from plants inoculated at all stages. When plants were inoculated at earlier growth stages, large amount of the fungus was recovered from both root and stem plate tissues of harvested bulbs. This coincided with the highest amount of basal rot of the bulbs in storage. Fresh bulb wt was reduced at harvest and the development of disease symptoms occurred during the storage of bulbs. Implications of the results for disease development and plant protection are discussed.