Potencial de herbicidas para o controle de patógenos de solo do feijão

Lehner, Miller da Silva; Júnior, Trazilbo J. Paula; Vieira, Rogério Faria; Lima, Renan Cardoso; Silva, R.A.; Soares, Bruno Alvarenga; Nascimento, Moysés; Carneiro, José Eustáquio Souza

doi:10.1590/s0100-83582014000100013

Planta daninha

2014

DOI: 10.1590/s0100-83582014000100013

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Potencial de herbicidas para o controle de patógenos de solo do feijão

Miller da Silva Lehner

Trazilbo J. Paula Júnior

Rogério Faria Vieira

et al.

Abstract: . Por isso, o efeito desse herbicida também foi testado em duas concentrações (1.000 ou 12.000 mg L -1 ) na germinação de escleródios de S. rolfsi e S. sclerotiorum (miceliogênica) ou de S. sclerotiorum (carpogênica). Não houve efeito significativo de S-metolachlor na germinação miceliogênica de escleródios desses dois fungos. Entretanto, o S-metolachlor retardou a germinação carpogênica de escleródios de S. sclerotiorum. Os resultados sugerem que o herbicida S-metolachlor tem potencial de uso no manejo de doe… Show more

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Cited by 2 publications

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How can an in vitro incompatibility of Trichoderma-based products and herbicides impact the parasitism and control of white mold (Sclerotinia sclerotiorum (Lib.) De Bary)?

Canuto da Silva,

de Faria,

Guimarães

et al. 2024

Crop Health

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The integration of management methods for both diseases and weeds depends on the compatibility between the tools. Biological control represents an important strategy to cope with the integrated management of white mold (Sclerotinia sclerotiorum) through parasitism of sclerotia. However, its application in the field is more cost-effective if combined with the herbicide in a tank mix, as long as the products are compatible. Therefore, we aimed at (i) evaluating two compatibility test methodologies (constant exposure and different times) and (ii) two soybean crop seasons to infer the compatibility of Trichoderma-based products. In vitro bioassays were performed to assess the compatibility between herbicides (Haloxifope-p- methyl, Glyphosate N-ammonium salt, Fluasifope-p-butyl, Fomesafem, Chlorimuron ethyl and Imazapyc + Imazapyr) and two biocontrol agents (Trichoderma asperellum and Trichoderma harzianum). Thus, the recommended spray volume for each herbicide was added to the PDA culture medium (Potato-Dextrose-Agar) and then deposited in the center of the plate a disc of mycelium from each antagonist isolate (constant exposure). The tests with time of exposure were marked at times 0, 2, 4, 8 and 16 h (simulating tank mixing) and at the spp of each time were plated on PDA medium. For both tests, the mycelial growth and conidiogenesis of Trichoderma spp. were observed. The combination of herbicide and biocontrol was also tested in the field and sclerotia parasitism, white mold incidence and plant yield were assessed in two field trials. The constant exposure of the antagonists to herbicides revealed that no herbicide was compatible with the T. asperellum or T. harzianum. While in test, exposure time exhibited compatibility with either T. asperellum or T. harzianum, within a period of 2 to 8 h. Conclusively, the integration of biocontrol agents with the herbicide imazapique + imazapyr exhibited significant reductions in white mold disease incidence and conidia germination, along with effective parasitism of S. sclerotiorum and even the least compatible herbicide (glyphosate) resulted in significant reduction in the disease incidence and sustained yield when compared to the untreated control. Therefore, the integration of the biocontrol agent for white mold should always be considered, and the tank mixing of it with the herbicide represents a cost-effective alternative for the grower.

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How can an in vitro incompatibility of Trichoderma-based products and herbicides impact the parasitism and control of white mold (Sclerotinia sclerotiorum (Lib.) De Bary)?

Canuto da Silva,

de Faria,

Guimarães

et al. 2024

Crop Health

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Does Hyphal‐Tip Ensure the Same Allelic Composition at SSR Loci as Monosporic Isolates of Sclerotinia sclerotiorum?

Lehner

Júnior

Mizubuti

2015

Journal of Phytopathology

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The proper characterization of individual is a basic stage in population genetic studies. In Sclerotinia sclerotiorum, genetic uniformity of an individual can be obtained by isolation of single ascospore; however, hyphal-tip isolates are commonly used in genetic studies. The aim of this study was to assess whether hyphal-tip isolates of S. sclerotiorum can be used as surrogate of monoascosporic (monosporic) isolates. Twenty-eight isolates of S. sclerotiorum were collected from common bean plants with white mold symptoms and were purified by hyphal-tip or single ascospore. The correspondence between hyphal-tip and monosporic isolates was assessed through the allelic composition at 10 microsatellite (SSR) loci of the isolates obtained by both methods. For the SSR loci comprised of dinucleotide repeats in 92% of the cases, the difference (di) between the amplicon size values for hyphal-tip and monosporic isolates was no more than one base pair. For the loci comprised of tetra or pentanucleotide repeats in 89% of the cases, di was no more than one base pair. The same allelic profile was found for hyphal-tip or single ascospore isolates of S. sclerotiorum. When monosporic isolates cannot be easily obtained, hyphal-tip can safeguard the genotypic identity of S. sclerotiorum isolates.

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Potencial de herbicidas para o controle de patógenos de solo do feijão

Cited by 2 publications

References 18 publications

How can an in vitro incompatibility of Trichoderma-based products and herbicides impact the parasitism and control of white mold (Sclerotinia sclerotiorum (Lib.) De Bary)?

How can an in vitro incompatibility of Trichoderma-based products and herbicides impact the parasitism and control of white mold (Sclerotinia sclerotiorum (Lib.) De Bary)?

Does Hyphal‐Tip Ensure the Same Allelic Composition at SSR Loci as Monosporic Isolates of Sclerotinia sclerotiorum?

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