Rhizoctonia Root Rot of Small Grains Favored by Reduced Tillage in the Pacific Northwest

Weller, David M.; Cook, Robert; MacNish, G. C.; Bassett, E. N.; Powelson, R. L.; Petersen, Regina

doi:10.1094/pd-70-70

Cited by 107 publications

(39 citation statements)

References 3 publications

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“…Root infection can be reduced by soil disturbance such as tillage prior to planting (Weller et al 1986), but many producers are reducing tillage in order to reduce soil erosion. Also, when levels of inoculum of F. avenaceum in the soil are high, the impact of antagonism by soil microbiota may be reduced (Garrett 1956;Fletcher et al 1991), which could result in a further increase in root rot severity.…”

Section: Host Specificitymentioning

confidence: 99%

Effect of temperature, seeding date, fungicide seed treatment and inoculation with Fusarium avenaceum on seedling survival, root rot severity and yield of lentil

Hwang¹,

Gossen²,

Turnbull³

et al. 2000

Can. J. Plant Sci.

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. 2000. Effect of temperature, seeding date, fungicide seed treatment and inoculation with Fusarium avenaceum on seedling survival, root rot severity and yield of lentil. Can. J. Plant Sci. 80: 899-907. Early seeding of lentil is necessary on the northern prairies to ensure that the crop has time to mature. However, planting into cold soils in spring results in slow germination, which may predispose seedlings to infection by soil-borne pathogens. In a controlled-environment study of the impact of temperature on infection of lentil seedlings (cv. Eston) by Fusarium avenaceum, root rot symptoms were most severe at warm temperatures (20°to 27.5°C) and declined in warmer or cooler soils. Field plots were seeded on three dates, which were spaced about 2 wk apart between early May and early June in four station years. Seedling emergence was most consistent and seed yield was highest in three of four sites at the second seeding date. Emergence and yield were substantially lower for the latest seeding date. Inoculation with F. avenaceum reduced establishment and seed yield. Seed treatment with Crown (thiabendazole and carbathiin) improved seedling survival, reduced root rot severity and increased seed yield relative to the inoculated control. Vitaflo-280 (thiram and carbathiin) also improved establishment and yield, but the effect was not as strong or consistent. Treatment with Raxil (tebuconazole) and Apron (metalaxyl) had no effect. The pathogenicity of aggressive isolates of F. avenaceum from lentil on a range of crop species was evaluated. All crops were susceptible to some degree, which indicates that the pathogen, once established, is likely to persist in a field for some time. This study demonstrated that early planting was required for maximum yield, that certain isolates of F. avenaceum were pathogenic on a wide range of hosts, and that seed treatment can be used to minimize losses from seedling blight and root rot in lentil. Dans la partie nord des Prairies, la lentille doit être semée de bonne heure au printemps si on veut qu'elle ait le temps de mûrir. Cependant, son installation dans les sols froids ralentit la germination, exposant les jeunes plantes à l'infection par les pathogènes telluriques. Dans le cadre de travaux en milieu contrôlé sur les effets de la température sur l'infection des plantules de lentille, cultivar Eston, par Fusarium avenaceum, les symptômes de pourridié les plus graves étaient observés sous régime de températures chaudes (20 à 27,5°C) et perdaient de leur intensité au-dessus ou en dessous de cet écart. Des parcelles expérimentales étaient semées au champ à quatre années-stations (1996-1998) à trois dates, échelonnées à environ deux semaines d'intervalle entre le début de mai et le début de juin. Le taux de levée le plus stable et le rendement grainier le meilleur étaient obtenus à 3 des 4 emplacements pour la deuxième date de semis, mais les valeurs de ces deux paramètres étaient nettement plus basses pour la dernière date de semis. L'inoculation de F. avenaceum provoquait une réd...

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Section: Host Specificitymentioning

confidence: 99%

Effect of temperature, seeding date, fungicide seed treatment and inoculation with Fusarium avenaceum on seedling survival, root rot severity and yield of lentil

Hwang¹,

Gossen²,

Turnbull³

et al. 2000

Can. J. Plant Sci.

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“…It was discovered in Australia in the 1930s (2) and in the Pacific Northwest (PNW) in the mid-1980s (1,3). To date, no wheat or barley (Hordeum vulgare L.) cultivars are resistant to Rhizoctonia (4).…”

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confidence: 99%

Role of Bacterial Communities in the Natural Suppression of Rhizoctonia solani Bare Patch Disease of Wheat (Triticum aestivum L.)

Yin

Hulbert

Schroeder

et al. 2013

Appl Environ Microbiol

217

153

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dRhizoctonia bare patch and root rot disease of wheat, caused by Rhizoctonia solani AG-8, develops as distinct patches of stunted plants and limits the yield of direct-seeded (no-till) wheat in the Pacific Northwest of the United States. At the site of a long-term cropping systems study near Ritzville, WA, a decline in Rhizoctonia patch disease was observed over an 11-year period. Bacterial communities from bulk and rhizosphere soil of plants from inside the patches, outside the patches, and recovered patches were analyzed by using pyrosequencing with primers designed for 16S rRNA. Taxa in the class Acidobacteria and the genus Gemmatimonas were found at higher frequencies in the rhizosphere of healthy plants outside the patches than in that of diseased plants from inside the patches. Dyella and Acidobacteria subgroup Gp7 were found at higher frequencies in recovered patches. Chitinophaga, Pedobacter, Oxalobacteriaceae (Duganella and Massilia), and Chyseobacterium were found at higher frequencies in the rhizosphere of diseased plants from inside the patches. For selected taxa, trends were validated by quantitative PCR (qPCR), and observed shifts of frequencies in the rhizosphere over time were duplicated in cycling experiments in the greenhouse that involved successive plantings of wheat in Rhizoctonia-inoculated soil. Chryseobacterium soldanellicola was isolated from the rhizosphere inside the patches and exhibited significant antagonism against R. solani AG-8 in vitro and in greenhouse tests. In conclusion, we identified novel bacterial taxa that respond to conditions affecting bare patch disease symptoms and that may be involved in suppression of Rhizoctonia root rot and bare batch disease.

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“…The narrow zones of stunted and unthrifty plants, like ribbons across the field as the crop developed, were the same zones that were green with volunteer cereals and weeds prior to seeding. The damage turned out to be due primarily to root rot caused by a combination of Rhizoctonia solani AG8 and R. oryzae living as root parasites on the volunteer cereals and weeds (33,35,50). The common practice was to spray with glyphosate and plant almost immediately, which was shown in both the southern Australian wheat belt (39) and the Intermountain PNW (48) to greatly exacerbate rhizoctonia root rot.…”

Section: Sorting Out Alternative Explanations For Crop Residue Effectsmentioning

confidence: 99%

Tell Me Again What It Is That You Do

Cook

2007

Annu. Rev. Phytopathol.

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My job at Pullman, Washington, starting in 1965, was to control the root diseases of wheat and barley, focusing first on fusarium root and crown rot, then including take-all and pythium and rhizoctonia root rots. In the absence of viable alternatives, the agronomic approaches used were implemented through design of cereal-based cropping systems. Starting in the late 1970s, the mission focused further on cereal-intensive direct-seed (no-till) cropping systems. A team effort demonstrated the role of indigenous antibiotic-producing fluorescent pseudomonads in the widespread decline of take-all in response to monoculture wheat (or barley-wheat sequences). Today, the suppression of take-all by these beneficial rhizobacteria is the centerpiece of an integrated system that augments take-all decline while limiting pythium and rhizoctonia root rots and fusarium root and crown rot in direct-seed systems. In such systems, "crop rotation" takes the form of different sequences of winter and spring wheat, barley and triticale varieties, and market classes, all susceptible to all four root diseases.

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Rhizoctonia Root Rot of Small Grains Favored by Reduced Tillage in the Pacific Northwest

Cited by 107 publications

References 3 publications

Effect of temperature, seeding date, fungicide seed treatment and inoculation with Fusarium avenaceum on seedling survival, root rot severity and yield of lentil

Effect of temperature, seeding date, fungicide seed treatment and inoculation with Fusarium avenaceum on seedling survival, root rot severity and yield of lentil

Role of Bacterial Communities in the Natural Suppression of Rhizoctonia solani Bare Patch Disease of Wheat (Triticum aestivum L.)

Tell Me Again What It Is That You Do

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