Effect of Nitrogen Nutrition of the Host on the Epidemiology of Puccinia Striiformis F.sp. Tritici and Crop Yield in Wheat.

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Abstract
A glasshouse experiment and a field experiment were performed to study the interaction between the rate of nitrogen applied to wheat, the epidemiology of stripe rust and the losses caused by the disease. Increased rates of nitrogen led to increased levels of stripe rust. In the glasshouse, infection with stripe rust reduced wheat yields at all nitrogen application rates, although at the higher rates there appeared to be some compensation for the stripe rust infection. Stripe rust interfered with the efficacy of absorbed nitrogen by reducing the level of nitrogen that was translocated from senescing leaves to other plant parts. These results suggest that the relationship between yield loss in wheat caused by stripe rust and the severity of the disease is affected by the nitrogen nutrition of the crop.

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