Seed-borne species of Myrothecium and their pathogenic potential

Nguyễn, Thu Hà; Mathur, S. B.; Neergaard, P.

doi:10.1016/s0007-1536(73)80156-1

Cited by 28 publications

(16 citation statements)

References 7 publications

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“…verrucaria IMI 361690 has several characteristics that make it desirable for use as a bioherbicide. Although most strains or isolates of M. verrucaria are weakly virulent pathogens [63][64][65], virulence can be influenced by manipulation of inoculum concentrations [39,41,65], and use of adjuvants, such as surfactants [39,41,48,65,66].…”

Section: Resultsmentioning

confidence: 99%

Biological Control of the Weed Hemp Sesbania (Sesbania exaltata) in Rice (Oryza sativa) by the Fungus Myrothecium verrucaria

2014

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Abstract:In greenhouse and field experiments, a mycelial formulation of the fungus Myrothecium verrucaria (IMI 361690) containing 0.20% Silwet L-77 surfactant exhibited high bioherbicidal efficacy against the problematic weed hemp sesbania. Infection and mortality levels of 100% of hemp sesbania seedlings occurred within 48 h after fungal application in the greenhouse. In rice field tests conducted over a three year period, M. verrucaria at an inoculum concentration of 50 g L −1 (dry mycelium equivalent) controlled 95% of ≤20 cm tall hemp sesbania plants. M. verrucaria also controlled larger plants (≥60 cm tall) using this high inoculum concentration. This level of weed control, as well as rice yields from plots where weeds were effectively controlled, were similar to those which occurred with the herbicide acifluorfen. These results suggest that a mycelial formulation of M. verrucaria has potential as a bioherbicide for controlling hemp sesbania in rice.

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Section: Resultsmentioning

confidence: 99%

Biological Control of the Weed Hemp Sesbania (Sesbania exaltata) in Rice (Oryza sativa) by the Fungus Myrothecium verrucaria

2014

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“…De maneira geral, a idade do fruto não foi determinante para elevação ou redução da severidade da doença, o que pode ser constatado pelas interações significativas com cultivares de meloeiro e isolados do patógeno. Como exemplo, frutos da cultivar AF-682 com 22 (17), ao registrarem a ocorrência da doença em plantios do Texas (EUA).…”

Section: Influência Da Idade Do Fruto Na Severidade Da Podridão-decraunclassified

Influência do método de inoculação, intensidade do ferimento e idade do fruto na severidade da podridão-de-cratera em melão

et al. 2008

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The crater rot of melon fruits, caused by Myrothecium roridum, frequently occurs in production fields at Northeast region of Brazil and causes yield losses. It was analyzed the influence of the inoculation method (pulverization, drop deposition, pulverization with wound, drop deposition with wound, and sub epidermal injection, wound intensity (0, 1, 3, 5, 7, 9 and 10 wounds) and age (0, 3 and 6 hours), and fruit age (12, 22 and 27 days) on the severity of the crater rot in melon fruits type Yellow (cv. AF-682) and Honeydew (cv. Orange Flesh), inoculated with three M. roridum isolates (CMM-609, CMM-636 and CMM-766). The crater rot severity was influenced by the interaction among inoculation methods, pathogen isolates and melon cultivars.Senhor, R.F.; Câmara, M.P.S.; Prichoa, L.F.; Lima, M.B.; Sales Jr., R.; Michereff, S.J. Influence of the inoculation method, intensity of the wound and fruit age on melon crater rot severity. Summa Phytopathologica, v.34, n.3, p.232-237, 2008 Additional keywords: Cucumis melo, Myrothecium roridum, pathogenesis, inoculation, epidemiology.Pulverization or drop deposition of inoculum propitiated the biggest lesions in the fruits submitted to wounds. However, symptoms were not observed in the fruits without wounds. The inoculation with sub-epidermal injection led to smaller lesions, in spite of also to cause wound in the fruit. The disease severity increased with the increment of the wound number, reaching the maximum with 10 wounds. A tendency of reduction of the disease severity was verified in fruits with the increase of the wound age. The lesions were significantly smaller in the fruits wounded 6 hours before the inoculation than in those wounded immediately before the inoculation. The fruit age was not decisive for increasing or reducing the crater rot severity.O meloeiro (Cucumis melo L.) é uma das olerícolas mais cultivadas no mundo, com área estimada em 1,32 milhões de hectares e produção de 27,7 milhões de toneladas (9). No Brasil, a região Nordeste é responsável por aproximadamente 99,5% (282.000 t) da sua produção, destacando-se na oferta de melão tanto no mercado interno quanto para a exportação. Os maiores pólos produtores de melão situam-se nos estados do Rio Grande do Norte e Ceará, sendo estes o Mossoró/ Assu e o Baixo Jaguaribe, respectivamente (12).Apesar de sua adaptação às condições edafo-climáticas predominantes na região Nordeste, inúmeros fatores têm contribuído Palavras -chave adicionais: Cucumis melo, Myrothecium roridum, patogênese, inoculação, epidemiologia. RESUMOA podrid ão-de-cratera dos frutos de meloeiro, caus ada por Myrothecium roridum, vem ocorrendo com freqüência nos plantios da região Nordeste e ocasionando perdas de produção. Foi analisada a influência do método de inoculação (gota, pulverização, gota com ferimento, pulverização com ferimento e injeção subepidérmica), da intensidade (0, 1, 3, 5, 7, 9 e 10 ferimentos) e idade de ferimento (0, 3 e 6 horas) e da idade do fruto (12, 22 e 27 dias) na severidade da podridão-de-cratera em melã...

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“…Myrothecium verrucaria has been reported as a weak pathogen on several plant species (Nguyen et al, 1973;Domsch et al, 1980;Yang & Jong, 1995a). Virulence of other M. verrucaria isolates can be in¯uenced by manipulatio n of inoculum concentration (Yang & Jong, 1995a).…”

Section: Field Experimentsmentioning

confidence: 99%

Biological Control of Kudzu ( Pueraria lobata ) with an Isolate of Myrothecium verrucaria

Boyette¹,

Walker²,

Abbas³

2002

Biocontrol Science and Technology

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An isolate of the fungus Myrothecium verrucaria (MV) was evaluated for biocontrol potential against kudzu (Pueraria lobata). In greenhouse tests, MV was highly virulent against kudzu in the absence of dew when conidia were formulated in 0.2% Silwet L-77 surfactant (SW). Inoculum concentrations > 2 3 10 7 conidia ml 2 1 were required to satisfactorily control plants in the third leaf stage and larger. In controlled environment experiments, kudzu mortality was greater at higher temperatures (25-40ë C) than at lower temperatures (10-20ë C), although pathogenesis and mortality occurred at all temperatures tested. In Weld tests, transplanted kudzu seedlings in the 2-3 leaf growth stage treated with MV at 2 3 10 7 conidia ml 2 1 in 0.2% SW, exhibited leaf and stem necrosis within 24 h following inoculation, with mortality occurring within 96 h. After 7 days, 100% of inoculated kudzu plants were killed in plots treated with the fungus/surfactant mixtures. Similar results were observed in a naturally occurring kudzu population , where 100% control occurred within 14 days after inoculatio n with 2 3 10 7 conidia ml 2 1 in 0.2% SW. In summary, MV eVectively controlled kudzu in the absence of dew over a wide range of physical and environmental conditions and under Weld conditions. These results indicate that, when properly formulated, MV has potential as a valuable bioherbicid e for controlling kudzu.

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Seed-borne species of Myrothecium and their pathogenic potential

Cited by 28 publications

References 7 publications

Biological Control of the Weed Hemp Sesbania (Sesbania exaltata) in Rice (Oryza sativa) by the Fungus Myrothecium verrucaria

Biological Control of the Weed Hemp Sesbania (Sesbania exaltata) in Rice (Oryza sativa) by the Fungus Myrothecium verrucaria

Influência do método de inoculação, intensidade do ferimento e idade do fruto na severidade da podridão-de-cratera em melão

Biological Control of Kudzu ( Pueraria lobata ) with an Isolate of Myrothecium verrucaria

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