Equations for Integrating Components of Slow Leaf-Rusting Resistance in Wheat

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Abstract
Equations were developed to help predict how various components of slow-rusting resistance, measured in monocyclic inoculation experiments, interact under field conditions. These equations incorporate the effects of infection efficiency (the number of uredia/100 spores [of Puccinia recondita] landing on a [wheat, Triticum aestivum] leaf), latent period, uredium size, urediospores produced per uredium per day, and infectious period per uredium. In handling latent period data, the equations account for the fact that the infections occurring on a given day erupt into uredia over a period of several days. The equations can be used to predict how certain combinations of slow-rusting resistance components might retard an epidemic and as a guide for selecting the most valuable segregants in breeding for slow-rusting resistance.