Resistance to Downy Mildew inCucumis meloPlant Introductions and American Cultivars

1 January 1982

journal article
research article
Published by Scientific Societies in Plant Disease

Vol. 66 (1) , 500-502
https://doi.org/10.1094/pd-66-500

Abstract

Twenty-two C. melo plant introductions, 14 cantaloupe cultivars, and other selected Cucurbitaceae were evaluated for resistance to downy mildew [Peronospora cubensis] under epiphytotic conditions at Weslaco, Texas [USA], in 1978 and 1979. Only 9 plant introductions, all from India, and 3 cultivars had .ltoreq. 50% leaf loss due to the disease. The most resistant entry was an inbred derivative of PI 124111. C. sativus and Citrullus lanatus were infected in both years. Luffa cylindrica was not infected in either year. Three species of Cucurbita were infected in 1979 but not in 1978. Artificial inoculations in growth chambers produced the same differential host response that was expressed under field conditions.

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