Sporulation and infectivity of Uromyces phaseoli in relation to pustule density and environmental conditions
1988
Gersbeck, B. (Hannover Univ. (Germany, F.R.). Inst. fuer Pflanzenkrankheiten und Pflanzenschutz) | Schoebbeck, F.
The influence of various environmental conditions on sporulation of Uromyces phaseoli was investigated at different pustule densities. High nutrient levels increased the sporulation per pustule at all densities. Stress during the preinoculation period resulted in an increase of infection density irrespective of inoculum quantity. At low pustule densities, stress promoted also the sporulation ratio per pustule. The application of systemic fungicides at sublethal doses reduced the number of pustules and delayed the onset of fructification of the fungus. However, the intensity of sporulation was increased subsequently. The evidence of this effect was correlated with increasing pustule density. Furthermore, there was higher infectivity of spores produced in pustules of high pustule density than those produced at low pustule density
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