Plantas daninhas hospedeiras alternativas de Colletotrichum guaranicola em cultivos de guaraná no Estado do Amazonas

Miléo, L.J.; Silva, J. F.; Bentes, J. L. S.; Christoffoleti, Pedro Jacob

doi:10.1590/s0100-83582007000400014

Cited by 13 publications

(9 citation statements)

References 12 publications

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“…It is important to underline that most of the weeds studied can also be hosts for several other species of phytonematodes of the genus Meloidogyne, also known as gall nematodes, besides hosting some species of fungi, e.g., Colletotrichum sp., and pest insects, such as aphids, which transmit viruses (Maziero et al, 2007;Miléo et al, 2007;Mônaco et al, 2009;Bellé et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Reproduction of Pratylenchus zeae on Weeds

et al. 2017

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-Weeds can be hosts of root-lesion nematode (Pratylenchus spp.), maintaining or increasing their population in the soil. The objective of this study was to evaluate the reaction of 25 weeds species to the nematode Pratylenchus zeae. The weed plants were individually inoculated with 1,000 individuals of P. zeae and maintained in a greenhouse for 90 days. After this period, eggs and nematodes were extracted, quantified, and the reproduction factor (RF = final population/initial population) was calculated. All tested weeds were susceptible (RF>1) to P. zeae, and the species Brachiaria decumbens, Rhynchelytrum repens, Digitaria insularis, D. horizontalis, B. brizantha were the most susceptible to this parasite.Keywords: invasive plants, susceptibility, lesion nematode, parasite. RESUMO -As plantas daninhas podem ser hospedeiras de nematoides das lesões (Pratylenchus spp.), mantendo ou elevando sua população no solo. O objetivo deste trabalho foi avaliar a reação de 25 espécies de plantas daninhas a Pratylenchus zeae. As plantas daninhas foram individualmente inoculadas com 1.000 espécimes de P. zeae e mantidas em casa de vegetação por 90 dias. Após esse período, os ovos e nematoides foram extraídos e quantificados, sendo calculado o fator de reprodução (FR = população final/população inicial

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Section: Resultsmentioning

confidence: 99%

Reproduction of Pratylenchus zeae on Weeds

et al. 2017

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“…Clidemia capitellata is native from southern Mexico to Colombia and the West Indies but has apparently also naturalised in several areas in Brazil where it is a weed in Gurana plantations (Miléo et al, 2007). In flower, Clidemia capitellata is easily distinguished from C. hirta as the sessile flowers "are clustered and well placed on a strong central axis and at the ends of short branches" (Croat, 1978), whereas the flowers of C. hirta are in short, terminal or axillary panicles ( Fig.…”

Section: Clidemia Capitellatamentioning

confidence: 99%

Additions to the Flora of Singapore, new and overlooked records of naturalised plant species (1)

Chen¹,

Ho²,

Choo³

et al. 2018

GBS

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Nine species of plants that are casual or have become naturalised are newly recorded for Singapore. Six of these are weeds assumed to have only recently arrived in Singapore: Cuscuta campestris Yunck., Clidemia capitellata (Bonpl.) D.Don, Decalobanthus peltatus (L.) A.R.Simões & Staples, Erigeron bellioides DC., Justicia comata (L.) Lam., Mecardonia procumbens (Mill.) Small. The remaining three have been in Singapore for some time but have been previously overlooked: Pseudelephantopus spicatus (Juss. ex Aubl.) C.F.Baker, Praxelis clematidea R.M.King & H.Rob and Spigelia anthelmia L.

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“…Some authors describe the presence of phytopathogenic fungi associated with weeds causing diseases in crops, such as Paullinia cupana, Cucumis melo and Eucalyptus sp. (MILÉO et al, 2007;SALES JÚNIOR et al, 2012;VASCONCELOS et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Seeds of weeds as an alternative host of phytopathogens

Oliveira

Santos

2018

Arq. Inst. Biol.

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Weeds compete with agricultural crops for water, light, nutrients and space, besides having an extensive seed bank. However, another aspect to be considered relates to few studies pointing out weeds as hosts of phytopathogenic fungi. Many fungi, the main cause of diseases in plants, are known to use seeds as an efficient means of survival and dispersal. The objective of this work was to evaluate the health of weed seeds and the pathogenicity of fungi associated to plants of agricultural importance. The seeds were collected manually in Cerrado areas located in the municipality of Gurupi, Tocatins, Brazil. The blotter test method was used to evaluate seed health. The incidence of fungi was evaluated through an individual analysis of seeds using a stereoscopic and an optical microscope. The pathogenicity of fungi from weed seeds was evaluated by inoculation in plants of agronomic interest and, when pathogenic, we inoculated them in the host plant of the fungus. Weed seeds have been identified in fungi of the genus Alternaria, Aspergillus, Bipolaris, Cladosporium, Curvularia, Fusarium, Nigrospora, Papularia, Rhizopus and Pythium. The seeds of Acanthospermum australe, Bidens pilosa, Cenchrus echinatus, Digitaria horizontalis, Echinochloa crus-pavonis, Eleusine indica, Ipomoea sp., Pennisetum setosum, Sida rhombifolia, Spermacoce latifolia, Tridax procumbens and Vernonia polyanthes carry and disseminate fungi that, once inoculated, cause infection in plants of agricultural importance, such as Oryza sativa, Phaseolus vulgaris, Vigna unguiculata, Zea mays and Glycine max.

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Plantas daninhas hospedeiras alternativas de Colletotrichum guaranicola em cultivos de guaraná no Estado do Amazonas

Cited by 13 publications

References 12 publications

Reproduction of Pratylenchus zeae on Weeds

Reproduction of Pratylenchus zeae on Weeds

Additions to the Flora of Singapore, new and overlooked records of naturalised plant species (1)

Seeds of weeds as an alternative host of phytopathogens

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