Winter and Early Spring Survival of Puccinia recondita on Kansas Wheat During 1980-1986

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Abstract
Puccinia recondita survived the winter and early spring in wheat Triticum aestivum plots at Manhattan, Kansas [USA], in 4 of 7 yr during 1980-1986. Biweekly winter and spring observations of uredinia were recorded. During winter periods in which no uredinia were observed, plants were transplanted into the greenhouse at intervals to allow for development of latent infections. In 1982, 1983, and 1986, uredinia survived on late-planted wheat (October), but in 1985, uredinia survived on early-planted wheat (August and September). P. recondita survived on both early- and late-planted wheat in 1986. Losses of less than 2.0% occurred in years with no fungal survival in any of the date-of-planting plots, whereas losses were greater than 2.0% when the fungus did survive the winter and early spring or at least one-date-of-planting. Although maximum disease severities may have been identical, losses were greater in years in which P. recondita survived than in years in which it did not. This was due to maximum severities being reached up to 2 wk earlier in plots where survival occurred. Pathogenicity of surviving inoculum may be very different from pathogenicity of airborne inoculum being deposited on the plot.

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