Abstract
Viable urediniospores and dormant mycelia are the principal inoculum sources that contribute to the establishment and development of destructive wheat rust epidemics in the central Great Plains of the United States. Inoculum survival was measured by exposing urediniospores of Puccinia recondita and P. graminis to field conditions occurring at 1 m above ground level throughout two crop years. Four phases (summer, fall, winter, and spring) important in survival of urediniospores as potential inoculum in epidemic development were used in data analysis. Survival of P. recondita and P. graminis urediniospores during wheat dormancy (winter) was reduced to 10-11 and 17-21%, respectively, within 24 h [...]
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