EFFECT OF FREQUENCY OF IRRIGATION AND CULTIVAR ON THE INCIDENCE OF PINK ROOT ROT DISEASE OF ONIONS

Field experiments were run for two seasons, 1978/79 and 1979/80 at Hudeiba Research Station to study the effect of frequency of irrigation on the incidence of the pink root rot disease.
Two main varieties: Nasi, a white dehydration cultivar, and Saggai, a popular red cultivar, were tested under four watering regimes; 4, 8, 12 and 16 days in a split-plot design experiment with the irrigation treatments in the main plots and the cultivars in the subplots.

Incidence of the disease increased with increased watering interval.
The disease incidence adversely affected yield components.
Differences among the irrigation treatments were highly significant (P = 0.01) in both seasons.
Differences between the varieties were highly significant (P = 0.01) in 1978/79, and significant (P = 0.05) in 1979/ 80 season.
No irrigation – variety interaction was found (P = 0.05). Higher yields were obtained with more frequent irrigation.
Saggai. the red variety proved to be mere tolerant to the disease as compared to the white Nasi variety.

VIII African Symposium on Horticultural Crops

Gaafar H. Mohamed Ali, Sami O. Fregoon, Hassan S. El Hassan

https://doi.org/10.17660/ActaHortic.1984.143.49