Effect of alternaria helianthi blight on yield components oil content and seed quality of sunflower helianthus annuus
Balasubrahmanyam, N.; Kolte, S.J.
Indian Journal of Agricultural Sciences 50(9): 701-706
In the rainy seasons of 1975 and 1976, the blight caused by A. helianthi (Hansf.) Tubaki and Nishihara significantly reduced average flower size, number of seeds per plant, seed yield per plant, 1000 seed wt and the percentage filling of seeds in 'EC 68413', 'EC 68414', 'EC 68415' and 'Sunrise Selection of sunflower (H. annuus Linn.). For both years the average yield loss ranged 27.75-80.65%. The loss in oil was maximum (30.70-33.80%) in 'Sunrise Selection' and minimum (19.00-24.32%) in 'EC 68415'. Seeds from the affected plants in all the varieties showed significantly low germination and seedling dry weight. The loss in germination ranged 23.0-32.6%.