Herbicide-pathogen interactions in soil-borne root diseases

Altman, Jack; Rovira, A. D.

doi:10.1080/07060668909501133

Cited by 50 publications

(30 citation statements)

References 15 publications

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“…Besides affecting target weeds, herbicides may interact in several ways with plants and soil microorganisms that may influence the plant-pathogen relationship (Altman and Rovira 1989;Dissanayake et al 1998). It is known that herbicides produce changes in the physiology and development of crop plants, thus increasing disease susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Effect of five postemergence herbicides on red clover shoot and root growth in greenhouse studies

Ceballos

Palma

Brevis

et al. 2005

phyto

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Société de protection des plantes du Québec (SPPQ)ISSN 0031-9511 (imprimé) 1710-1603 (numérique) Découvrir la revue Citer cet article Ceballos, R., Palma, G., Brevis, H., Ortega, F. & Quiroz, A. (2004). Effect of five postemergence herbicides on red clover shoot and root growth in greenhouse studies. Phytoprotection, 85(3), 153-160. doi:10.7202 MCPA, 2,4-DB, flumetsulam, bentazon, haloxyfop-methyl, flumetsulam/2,4-DB and bentazon/MCPA were studied in greenhouse experiments in order to evaluate their primary effects on red clover (Trifolium pratense) growth and root injury. The influence of these herbicides on root length, plant height, crown diameter, shoot and root dry weights, shoot phytotoxicity and root injury were studied at two application rates. Variable responses in the growth parameters were observed throughout the experimental period. Herbicides did not affect root length. By the end of experiment, plant height was increased by all herbicides except MCPA and bentazon/MCPA. Crown diameter was increased only with MCPA and 2,4-DB, whereas it was not affected by the other herbicides. Bentazon reduced root dry weight while the other herbicides had no effect. In general, MCPA, bentazon, and bentazon/MCPA reduced shoot dry weight. Although all herbicides caused early foliar damage, the plants recovered by the end of experiment comparable to the control plants. Bentazon and bentazon/MCPA produced the greatest shoot damage. Roots were injured from all herbicides, yet they usually recovered over time. However, bentazon/MCPA induced more severe root injury, up to 17% of the plants, causing seedlings died. These results suggest that some herbicides used to protect red clover against weeds may also affect red clover development, increasing its vulnerability to disease. [Effet de cinq herbicides de postlevée sur la croissance de tiges et de racines du trèfle rouge lors d'essais en serre]Le MCPA, le 2,4-DB, le flumetsulam, le bentazone, le haloxyfop-méthyl, le flumetsulam/2,4-DB et le bentazone/MCPA ont été étudiés lors d'expériences en serre afin d'évaluer leurs principaux effets sur la croissance du trèfle rouge (Trifolium pratense) ainsi que sur les dommages racinaires qu'ils pourraient lui causer. Les conséquences qu'ont ces herbicides sur la longueur des racines, la taille de la plante, le diamètre du collet, les poids secs des tiges et des racines, ainsi que leur phytotoxicité pour les tiges et les dommages aux racines ont été étudiés pour deux doses d'application. Les paramètres de croissance ont eu des résultats indépendants les uns des autres tout au long de la durée des expériences. Les herbicides n'ont pas eu d'effet sur la longueur des racines. À la fin des expériences, la taille de la plante avait été augmentée par tous les herbicides sauf le MCPA et le bentazone/MCPA. Le diamètre du collet n'avait été augmenté que par le MCPA et le 2,4-DB, alors que les autres herbicides n'avaient pas eu d'effet. Le bentazone a fait diminuer le poids sec des racines alors que les autres herbicides n'ont pas eu d'ef...

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Section: Introductionmentioning

confidence: 99%

Effect of five postemergence herbicides on red clover shoot and root growth in greenhouse studies

Ceballos

Palma

Brevis

et al. 2005

phyto

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“…Much more information on the effect of herbicides on pathogens can be found for R. solani than for R. cerealis (Altman and Campbell 1977;Lévesque and Rahe 1992). Unauthenticated Download Date | 5/9/18 7:31 AM Many authors report on herbicides enhancing the development of soil microorganisms (Altman and Rovira 1989). There can be a better development of microorganisms in soil after the use of herbicides.…”

Section: Discussionmentioning

confidence: 99%

“…Altman and Rovira (1989) reported 25 herbicides recommended for plant production, which stimulated the growth of R. solani in vitro. According to Katan and Eshel (1973), there are four mechanisms which can increase the intensity of diseases, namely by a direct effect of herbicides on pathogen growth, pathogen virulence, susceptibility of the host, and/or changes in the dependences between the pathogen and other soil organisms.…”

Section: Discussionmentioning

confidence: 99%

The Role of the Preceding Crop and Weed Control in the Transmission of Rhizoctonia Cerealis and R. Solani to Winter Cereals

Lemańczyk¹

2012

Journal of Plant Protection Research

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Abstract:Winter cereals (wheat, triticale, rye, barley) grown in experimental fields were assessed for sharp eyespot. Preceding crops (spring cereals and fallow) and weed control (herbicides application, no control) were taken into account. The health status evaluation was carried out at the stem elongation phase and at the milk maturity stage. The macroscopic estimation was accompanied by the analysis of fungal species identified on stem bases and roots, which showed various disease symptoms. The analysis of fungal species from the genus Rhizoctonia were especially noted. Mycological analysis of roots was carried out at the seedling growth and stem elongation phase, and stem bases at the seedling growth and milk maturity stage. Infection caused by Rhizoctonia spp. was confirmed by polymeraze chain reaction (PCR) assay. The highest infection was noted on wheat followed by triticale, rye and barley.Occurrence of sharp eyespot depended more on weed control than on what the preceding crop had been. At the milk maturity stage, lower severity of sharp eyespot of triticale, rye and barley was noted on plots not treated with herbicides, and on wheat with herbicide application. The research showed a significant effect of the preceding crop only on the health status of wheat. At the milk maturity stage, the highest infection was noted after spring triticale and the lowest after oats. Stems of cereals with sharp eyespot symptoms and healthy stems were settled mainly by Rhizoctonia cerealis (wheat -25.6%, triticale -12.0%, rye -22.2%, barley -11.3%), rarely by R. solani (respectively 6.0, 4.0, 2.9 and 1.8%). Rhizoctonia solani was isolated more often from roots with true eyespot and Fusarium foot rot symptoms. It may suggest that R. cerealis was the main causal agent of sharp eyespot on all tested cereals. The preceding crop did not affect the composition of Rhizoctonia species.

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“…O efeito de alguns herbicidas sobre doenças de plantas é conhecido, mas tem se demonstrado variável, pois enquanto a incidência e intensidade de algumas doenças diminuem com a aplicação de herbicidas, as de outras aumentam (Altman & Campbell, 1977;Altman & Rovira, 1989). Com o advento de cultivares de soja (Glycine max (L.) Merr.)…”

Section: Introductionunclassified

Utilização de glifosato para o controle de ferrugem da soja

Soares

Gazziero

Morita

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito de glifosato sobre a germinação de esporos de Phakopsora pachyrhizi e no controle da ferrugem da soja, aplicado preventiva e erradicativamente, em condições controladas. A germinação de esporos foi avaliada tendo-se vertido, em meio de cultura, soluções de esporos com diferentes concentrações do glifosato (0, 100, 1.000, 10.000 e 20.000 ppm) e fungicidas. Para avaliar o controle da ferrugem, plantas foram pulverizadas com glifosato, com variação da dose e do momento, tendo-se medido a severidade da doença. Houve efeito do produto sobre os esporos do fungo, o que reduziu sua germinação. As pulverizações em plantas, em casa de vegetação, mostraram um efeito do produto sobre a ferrugem, quando aplicado preventivamente, porém com período de proteção curto e fungitoxicidade inferior à do fungicida tebuconazole. O uso do glifosato, avaliado nesse ensaio, não deve ser visto como medida de manejo de ferrugem, e não interfere nas práticas habituais de controle da ferrugem da soja.Termos para indexação: Glycine max, Phakopsora pachyrhizi, difeconazole, tebuconazole. Glyphosate application on soybean rust controlAbstract -The objective of this work was to evaluate the effect of glyphosate on the germination of Phakopsora pachyrhizi spores, and on soybean rust control; applications were either preventive or eradicative under controlled conditions. The germination of spores was evaluated by pouring spores solutions on culture medium, with different concentrations of glyphosate (0, 100, 1,000, 10,000 and 20,000 ppm) and fungicides. For the rust control evaluation, plants were sprayed with glyphosate, varying doses and moments, and estimating the disease severity. The product reduced spores germination. Plants sprayed in greenhouse conditions, showed effect of the product on rust, when applied preventively, but with short protection period and lower fungus toxicity than tebuconazole fungicide. The use of glyphosate, evaluated in this trial, must not be taken as a rust management measure, and should not interfere in usual practices for soybean rust control.

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Herbicide-pathogen interactions in soil-borne root diseases

Cited by 50 publications

References 15 publications

Effect of five postemergence herbicides on red clover shoot and root growth in greenhouse studies

Effect of five postemergence herbicides on red clover shoot and root growth in greenhouse studies

The Role of the Preceding Crop and Weed Control in the Transmission of Rhizoctonia Cerealis and R. Solani to Winter Cereals

Utilização de glifosato para o controle de ferrugem da soja

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