Estimates of grain yield losses caused in sorghum (Sorghum bicolor L. Moench) by Striga asiatica (L.) Kuntze obtained using the regression approach uri icon

abstract

  • Regression approach was used to predict sorghum grain yield losses from Striga asiatica (L.) Kuntze in the susceptible sorghum hybrid cultivar, CSH 1, in India. Four hundred and eighty eight pairs of grain yield and Striga counts data obtained from 10 checkerboard trials were used in the regression analysis. Experiments were conducted at 6 locations in India and in some locations over 3 years. The R2 value of the best-fitted joint regression equation was 0.787. Mean grain yield loss estimates ranged from 9.2 to 27.6% of the potential yield between locations with an average loss of 17.5% in the rainy season. In the post-rainy season the average loss was 25.2% with a range of 20.1?39.6% across years. Potential loss estimates indicated the possibility of up to 98.6% crop loss at some locations in some years. Assuming only 10% of the hybrid sorghum crop area to be affected by the Striga infestation levels realized in these trials, it was predicted that, in India, about 53 000 t of sorghum grain worth about U.S. $4.9 million (approximately 67 million Indian rupees) is being lost every year

publication date

  • 1989
  • 1989