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

Published online by Cambridge University Press:  12 June 2017

Charlotte V. Eberlein ,
Anne W. Barkdoll  and
James R. Davis
Charlotte V. Eberlein
Affiliation:
Dep. Plant, Soil, and Entomol. Sci., Univ. of Idaho, Aberdeen Res. and Ext. Cent., Aberdeen, ID 83210
Anne W. Barkdoll
Affiliation:
Dep. Plant, Soil, and Entomol. Sci., Univ. of Idaho, Aberdeen Res. and Ext. Cent., Aberdeen, ID 83210
James R. Davis
Affiliation:
Dep. Plant, Soil, and Entomol. Sci., Univ. of Idaho, Aberdeen Res. and Ext. Cent., Aberdeen, ID 83210
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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.

Keywords

Eastern black nightshade, Solanum ptycanthum Dun. ♯ SOLPThairy nightshade, Solanum sarrachoides Sendt. ♯ SOLSApotato, Solanum tuberosum L. ‘Russet Burbank’Biological controlSolanum ptycanthumSolanum sarrachoidesSOLPTSOLSA
Type
Research
Information
Weed Technology , Volume 5 , Issue 3 , September 1991 , pp. 570 - 574
Copyright
Copyright © 1991 Weed Science Society of America 

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References

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