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Peanut Leaf Wettability and Susceptibility to Infection by Puccinia arachidis. Marion Cook, Former graduate student, University of the West Indies, Jamaica, Present address: c/o EMRO, c/o WHO/OMS, 1211-Geneva-27, Switzerland; Phytopathology 70:826-830. Accepted for publication 8 January 1979. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-826.

The differential susceptibility to Puccinia arachidis observed among nonphysiologically resistant cultivars of Arachis hypogaea was related to leaf wettability. Regardless of leaf or plant age, a similar positive regression of leaf susceptibility on wettability was detected for all the nonphysiologically resistant cultivars that were studied. No other factors significantly influenced the susceptibility of these cultivars to P. arachidis. When physiologic resistance was not being investigated, this differential wettability provided a quick and discriminating technique for the preliminary screening of cultivars and lines within cultivars for resistance to P. arachidis.

Additional keywords: leaflet size, stomatal density, surface wax, surfactant.