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

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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.

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