1. Weeds as the potential inoculum source of Colletotrichum fructicola responsible for strawberry anthracnose in Nara, Japan
- Author
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Satoshi T. Ohki, Ken'o Okayama, Motoaki Tojo, Yoshihiko Hirayama, and Shunsuke Asano
- Subjects
0106 biological sciences ,0301 basic medicine ,biology ,Inoculation ,ved/biology ,fungi ,ved/biology.organism_classification_rank.species ,food and beverages ,Erigeron annuus ,Plant Science ,biology.organism_classification ,01 natural sciences ,Amaranthus blitum ,03 medical and health sciences ,chemistry.chemical_compound ,Sonchus oleraceus ,030104 developmental biology ,chemistry ,Digitaria ciliaris ,Glyphosate ,Botany ,Weed ,Agronomy and Crop Science ,010606 plant biology & botany ,Blitum - Abstract
Colletotrichum fructicola is a major causal agent among anthracnose pathogens of strawberry in Nara, Japan. We hypothesized that a wide range of weeds growing in and around strawberry fields are inoculum sources of the disease and investigated their potential as hosts of C. fructicola. We also examined the influence of herbicide treatment on C. fructicola sporulation on weeds. The fungus was detected on 31 of 541 (5.7%) leaves sampled from 13 weed species from 2005 to 2008. The fungus was most frequently isolated from leaves of Amaranthus blitum with an isolation frequency of 17.9%; inoculation of A. blitum with the pathogen caused brown leaf spots. Other weeds such as Digitaria ciliaris, Galinsoga ciliata, Solidago altissima, Erigeron annuus, and Sonchus oleraceus were found to harbor the fungus at lower rates (4.3–8.1%) without symptoms. C. fructicola formed acervuli on leaves of A. blitum, D. ciliaris, and S. oleraceus after plants were killed by a herbicide (glyphosate). These results demonstrated that infected weeds associated with strawberry cultivation are potential inoculum sources of C. fructicola, especially after herbicide treatment. more...
- Published
- 2017
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