Canadian Journal of Plant Pathology (1997) 19, 256-259

E.C. Whiting and R.W. Roncadori (1997)
Occurrence of Colletotrichum gloeosporioides on pokeweed and sicklepod stems in Georgia and pathogenicity on black locust
Canadian Journal of Plant Pathology 19 (3), 256-259
Abstract: Pokeweed (Phytolacca americana) and sickle pod (Cassia obtusifolia), weeds occurring in a black locust (Robinia pseudoacacia) progeny test plantation in Greene County, Georgia, USA, were evaluated as possible reservoirs of inoculum of Colletotrichum gloeosporioides. C. gloeosporioides was recovered from 80% of pokeweed stems and 90% of sicklepod stems assayed in December 1994, from 100% of pokeweed steins collected in December 1994 but assayed in January 1995, and from 47% of pokeweed stems assayed in July 1995. Three weeks after inoculation with C. gloeosporioides, plus 15 days after detached stems were treated with the herbicide glufosinate to accelerate tissue senescence, acervuli were produced on 26 of 28 pokeweed stems. Acervuli covered an average of 28% of the surface area of 2-cm stem sections. An isolate of C. gloeosporioides obtained from pokeweed was as virulent on black locust as an isolate from black locust. C. gloeosporioides which infects black locust may form latent infections in pokeweed that may have epidemiological significance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Senna obtusifolia (weed)	Robinia (crop)	U.S.A. (SE)
	Colletotrichum gloeosporioides	Robinia (crop)	U.S.A. (SE)
	Phytolacca americana (weed)	Robinia (crop)	U.S.A. (SE)