Influence of soil moisture, seeding date, and<i>Rhizoctonia solani</i>isolates (AG 2-1 and AG 4) on disease incidence and yield in canola

Teo, B.K.; Yitbarek, S.M.; Verma, P. R.; Morrall, R. A. A.

doi:10.1080/07060668809501747

Cited by 26 publications

(22 citation statements)

References 11 publications

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“…Relatively cool and wet soil conditions are considered favorable for the pathogen, and adversely affect germination and establishment of seedlings by predisposing the plants to infection for a longer period (Dorrance et al 2003). The results of this study support Teo et al (1988), who reported that higher disease incidence at higher soil *, ** Significant at P < 0.05, and P < 0.01 level, respectively; -indicates no data collected. For personal use only.…”

Section: Resultssupporting

confidence: 80%

Effect of seed treatments on emergence, yield, and root rot severity of soybean under Rhizoctonia solani inoculated field conditions in Ontario

Xue¹,

Cober²,

Morrison³

et al. 2007

Can. J. Plant Sci.

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. 2007. Effect of seed treatments on emergence, yield, and root rot severity of soybean under Rhizoctonia solani inoculated field conditions in Ontario. Can. J. Plant Sci. 87: 167-173. Field trials were conducted with soybean at two sites each year from 2001 to 2003 in Ottawa, ON, to determine the effect of seed treatments with various combinations of seven formulated fungicides and the bioagent Yield Shield (Bacillus pumilus GB34) under Rhizoctonia solani inoculated conditions. Controls were untreated seed planted into both non-inoculated (natural) soil and soil inoculated with R. solani. Compared with the non-inoculated control, inoculation significantly increased root rot severity and reduced emergence by 27%, and yield by 31%. Under the inoculated conditions, none of the seed treatments significantly increased emergence or yield in all of the six trials when compared with the control. Allegiance (metalaxyl) plus Vitaflo-280 (carbathiin plus thiram) and Vitaflo-280 alone were the most effective seed treatments, increasing emergence in by 20 and 19% and yield by 21 and 26%, which were significantly better than the control in four and five trials for emergence and three and four trials for yield, respectively. Allegiance plus HEC5725 (HEC5725), Apron Maxx RTA (fludioxonil plus metalaxyl), and Maxim 480FS (fludioxonil) increased both emergence and yield in two trials and TFL RTU (metalaxyl plus trifloxystrobin) plus Yield Shield in one trial. There was no difference between seed treatment with Allegiance and the untreated control for all parameters, confirming that metalaxyl is ineffective to R. solani. It is concluded that carbathiin, thiram, HEC5725, fludioxonil and trifloxystrobin are effective active ingredients protecting soybean from soil-borne R. solani and increasing plant emergence and yield.

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Section: Resultssupporting

confidence: 80%

Effect of seed treatments on emergence, yield, and root rot severity of soybean under Rhizoctonia solani inoculated field conditions in Ontario

Xue¹,

Cober²,

Morrison³

et al. 2007

Can. J. Plant Sci.

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“…Seedling infection by AG2-1 isolâtes isfavoured bycool weather after planting, whereas warm weather g favours infection of mature plants by AG4 £ isolâtes (Teo et al 1988).…”

Section: Factors Affecting Disease Developmentmentioning

confidence: 99%

“…Results of field tests in Saskatchewan showed no consistent effect of soil moisture on AG2-1 or AG4-induced pre-emergence damping-off in rapeseed (Teo et al 1988;Yitbarek 1987). In the Peace River région of Alberta, however, surveys of brown girdling root rot from 1983 through 1985 showed that disease development was favoured by high rainfall and high soil moisture (Sippell et al 1985a).…”

Section: Factors Affecting Disease Developmentmentioning

confidence: 99%

“…When rapeseed was planted early before the soil warmed to 15°C, AG2-1 caused more damping-off than did AG4, while damping-off due to AG4 increased as the soil warmed to 20°C (Teo et al 1988;Yitbarek 1987). The influence of soil température on virulence was also reflected in the f requency with which thèse two AGs were isolated from diseased seedlings and mature plants .…”

Section: Factors Affecting Disease Developmentmentioning

confidence: 99%

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Biology and control of Rhizoctonia solani on rapeseed : A Review

Verma

2005

phyto

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Rhizoctonia solani AG2-1 is the principal pathogen causing damping-off and seedling and mature plant root rot (brown girdling root rot) in oilseed rape and canola (Brassica napus and B. rapa) in western Canada and the United States; AG4 isolates mainly attack adult plants and cause basai stem rot. Seedling infection by AG2-1 is favoured by cool weather atthe time of planting, whereas warm weather late in the growing season is more conducive for infection of mature plants by AG4 isolates. Survey data show that disease development is favoured by high soil moisture, low levels of nitrogen, phosphorus and potassium and high levels of copper in fine-textured soils. Moderate resistance in condiment mustard (Sinapis alba) and some other species appears to be genetically controlled and should be utilised in breeding programmes. Carboxin and iprodione in mixtures with insecticide gamma-HCH are recommended in Canada as seed treatments to control damping-off and seedling root rot, but do not control brown girdling root rot.

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“…However, early seeding into cold and wet soil may slow seed germination and seedling emergence (Kondra et al 1983) and so increases the vulnerability of canola to seedling blight and root rot (Sims et al 1998). For example, early seeding significantly increased seedling infection and root rot incidence in canola caused by R. solani (Teo et al 1988).…”

mentioning

confidence: 99%

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

et al. 2015

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Hwang, S. F., Ahmed, H. U., Turnbull, G. D., Gossen, B. D. and Strelkov, S. E. 2015. Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola. Can. J. Plant Sci. 95: 293–301. Seedling blight has a substantial impact on stand establishment and productivity of canola (Brassica napus) on the Canadian prairies. The effects of seeding date, seed size, seeding depth, and seed treatment fungicides on seedling blight of canola caused by Fusarium avenaceum and Pythium ultimum were evaluated under field conditions. In the trials inoculated with P. ultimum, early seeding reduced seedling emergence and seed yield in all 3 yr of the study. However, the interaction of F. avenaceum with seeding date was not consistent; inoculation with F. avenaceum reduced seedling emergence in early seeded canola in 1 of 4 yr, but emergence was higher in early than in mid-seeded treatments in 2 yr and there was no difference among seeding dates in 1 yr. Late seeding reduced seed yield in 2 of 4 yr in the F. avenaceum study. Seed size and seeding depth generally did not have an effect on seedling establishment or seed yield for either pathogen. Seed treatment with Helix Xtra (thiamethoxam+difenconazole+metalaxyl+fludioxonil) and Prosper FX (clothianidin+carboxin+trifloxystrobin+metalaxyl) fungicides increased seedling emergence and yield compared with the F. avenaceum-inoculated control. Seed treatment with Helix Xtra also increased seedling emergence and seed yield compared with the P. ultimum-inoculated control. Manipulation of seeding date did not substantially improve stand establishment or yield of canola when inoculum pressure was high. Seed treatment was the most effective strategy for reducing losses caused by seedling blight of canola in fields infested with F. avenaceum or P. ultimum.

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Influence of soil moisture, seeding date, andRhizoctonia solaniisolates (AG 2-1 and AG 4) on disease incidence and yield in canola

Cited by 26 publications

References 11 publications

Effect of seed treatments on emergence, yield, and root rot severity of soybean under Rhizoctonia solani inoculated field conditions in Ontario

Effect of seed treatments on emergence, yield, and root rot severity of soybean under Rhizoctonia solani inoculated field conditions in Ontario

Biology and control of Rhizoctonia solani on rapeseed : A Review

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

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