Infection and colonization of melon roots by Monosporascus cannonballus in two cropping seasons in Arizona and California |
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Authors: | M E Stanghellini † D H Kim M M Waugh D M Ferrin T Alcantara S L Rasmussen |
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Institution: | Department of Plant Pathology, University of California, Riverside, CA 92521;and;Department of Plant Pathology, University of Arizona, Tucson, AZ 85721, USA |
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Abstract: | Although canopy collapse of melons (one of the above-ground symptoms of vine decline caused by Monosporascus cannonballus ) occurred late in the growing season, the onset of root infection occurred much earlier. In three early winter-spring and two late winter-spring crops, the onset of root infection occurred 47–65 and 35–36 days after planting, respectively. In contrast, in four summer-autumn crops, the onset of root infection occurred within 9–17 days after planting. Vine decline occurred commonly in winter-spring crops, but did not occur in any of the summer-autumn crops. Following the onset of root infection, the percentage of plants infected increased at rates of 0·031–0·036 and 0·038–0·070 per unit per day for winter-spring and summer-autumn crops, respectively, based on the monomolecular disease progress model. Root lesions were first observed 14–42 days after the onset of infection in winter-spring crops, and 14–28 days after the onset of infection in summer-autumn crops. Pathogen reproduction occurred primarily at the end of each growing season. |
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Keywords: | Cucumis melo disease onset disease progression |
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