Factors Affecting Viability of Spore Inoculum In Peronospora Tabagina Adam and Lesion Production In tobacco Plants

Abstract

Spores of P. tabacina lose viability when in low concentrations in water. The most rapid rate of loss, from 99 to 50% germination in 3 hr, was at 15 and 20°C followed by decreasing rates for 10, 30, 5, and 25°C in that order. At 37·5 and 35°C a few spores survived for 30-60 min.