Abstract
Potential aecial hosts of Puccinia substriata var. indica were tested for resistance or susceptibility to better understand their potential role in epidemics of pearl millet rust. Thirty-one accessions of Solanum melongena, each collected from a different country, and accessions of twenty-seven other Solanum species were evaluated. Resistance or susceptibility was determined from natural infection in an isolated field location and inoculations in the greenhouse. All accessions of S. melongena were susceptible, except PI 413784 from Burkina Faso and PI 401533 from the Ivory Coast, countries that are near the center of origin of pearl millet. Newly identified aecial hosts include S. anguivi, S. ferox, S. gilo, S. incanum, S. linaeanum, S. nodiflorum, and S. rostratum. All other Solanum species evaluated were resistant. Accessions of two weed species from the United States, S. americanum and S. aviculare, were resistant and may play no role in the epidemiology of pearl millet rust in the United States.
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