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Pathogenicity of Colletotrichum coccodes Isolates to Potato (Solanum tuberosum) and Two Nightshade (Solanum spp.) Species

Charlotte V. Eberlein, Anne W. Barkdoll and James R. Davis
Weed Technology
Vol. 5, No. 3 (Jul. - Sep., 1991), pp. 570-574
Stable URL: http://www.jstor.org/stable/3987039
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Pathogenicity of Colletotrichum coccodes Isolates to Potato (Solanum tuberosum) and Two Nightshade (Solanum spp.) Species
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Abstract

Pathogenicity of four Colletotrichum coccodes isolates to potato, eastern black nightshade, and hairy nightshade was evaluated in greenhouse studies. Three Idaho isolates, AC-14, AC-28, and AC-44, and an isolate obtained from Mycogen Corporation, AC-Myc, produced lesions on potato foliage. Plants inoculated with AC-14, AC-28, and AC-44 also showed wilt symptoms similar to those produced by Verticillium dahliae as potatoes were beginning to senesce. Infection by AC-44 reduced tuber fresh weight and specific gravity. All isolates colonized eastern black and hairy nightshade, although some isolates caused little or no symptom development. Thus, both species may serve as sources of primary inoculum for C. coccodes isolates that are pathogenic to potatoes. Only AC-Myc substantially injured the leaves of both nightshade species. AC-Myc was more pathogenic to eastern black than to hairy nightshade, and to plants inoculated at the 3- to 4-leaf versus the 7- to 8-leaf stage.

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