Different Locations In Pakistan Research Articles

Development of Stripe and Leaf Rusts in Wheat Cultivar Mixtures

AbstractDevelopment of stripe and leaf rusts was studied for a two year period, from 1988 to 1990, in four cultivars of bread wheat planted in pure stands as well as in mixtures of different compositions in trials conducted at two different locations in Pakistan. The relative rate of disease development appeared to be slower in plots planted to cultivar mixtures as compared to that with pure stands of the same cultivars. Similarly, the area under the disease progress curve in cultivar mixtures was reduced, the reduction being proportional to the amount of the resistant component in the composite. Frequency of individual virulences in the parasite population also remained constant during the period of these studies. Differences in yield between plots with mixed populations and those with pure stands were also found to be statistically significant.