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Research. Expression of Adult Resistance to Stripe Rust at Different Growth Stages of Wheat. Hong Ma, Former Post-Doctoral Fellow, International Maize and Wheat Improvement Center (CIMMYT), Lisboa 27, Apdo. Postal 6-641, 06600, Mexico, D.F., Mexico. Ravi P. Singh, Geneticist/Pathologist, International Maize and Wheat Improvement Center (CIMMYT), Lisboa 27, Apdo. Postal 6-641, 06600, Mexico, D.F., Mexico. Plant Dis. 80:375. Accepted for publication 18 December 1995. Copyright 1996 The American Phytopathological Society. DOI: 10.1094/PD-80-0375. Stripe, or yellow, rust (Caused by Puccinia striiformis) is a common disease of wheat in cool, humid climates. Genes that confer adult resistance to stripe rust are known to be present in high-yielding spring wheats (Triticum aestivum). However, it is not known when in the growth of the plant adult resistance is first expressed. The objectives of the study were to evaluate the expression of adult resistances at various growth stages in the greenhouse, and to assess the effect of such resistances on stripe rust development in the field. Eight wheat cultivars known lo carry different levels of adult resistance and three susceptible cultivars were evaluated for resistance in the greenhouse at six growth stages (from seedling to anthesis), using a Mexican race of P. striiformis. Resistance was measured by infection type (IT) and latent period (LP). The cultivars were also evaluated in the field using the same race to determine disease progress. In all tests, |