Planta Daninha (2007) 25, 771-782

L.J. Miléo, J.F. Silva, J.L.S. Bentes and P.J. Christoffoleti (2007)
Plantas daninhas hospedeiras alternativas de Colletotrichum guaranicola em cultivos de guaraná no Estado do Amazonas
[Alternative host weeds of Colletotrichum guaranicola in guarana crops in the State Amazonas]
Planta Daninha 25 (4), 771-782
Abstract: Weed infestation may reduce grain guarana crops yield and host plant pathogens becoming potential inoculum sources. This research identified weed species colonized by the fungus Colletotrichum guaranicola in the guarana crop in four counties in the state of Amazon. The weeds were identified fungi presence was observed by isolation from leaf fragments of leaves injured by the fungi. The weed species colonized by Colletotrichum guaranicola were Bidens bipinnata, Chloris sp., Clidemia capitellata, Cyperus flavus, Elephantopus scaber, Euphorbia brasiliensis, Hemidiodia sp., Hyptis lantanifolia, Paspalum conjugatum, Physalis angulata and Synedrella nodiflora, that may represent a strong potential of plant pathogen inoculum, along with the guarana plants. Weed diversity in guarana crop shows the importance of establishing management practices to control these weeds, mainly in the Maues county, where higher colonization of the weed plants by the fungi was observed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Pedro Jacob Christoffoleti

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.
	Physalis angulata (weed)		Brazil (NW)
	Elephantopus mollis (weed)		Brazil (NW)
	Paspalum conjugatum (weed)		Brazil (NW)
	Synedrella nodiflora (weed)		Brazil (NW)
	Cyperus aggregatus (weed)		Brazil (NW)
	Colletotrichum guaranicola	Guarana (Paullinia cupana)	Brazil (NW)