Evaluation of strategies for the control of canola and lupin seedling diseases caused by Rhizoctonia anastomosis groups

Lamprecht, S. C.; Tewoldemedhin, Yared Tesfai; Calitz, F. J.; Mazzola, Mark

doi:10.1007/s10658-011-9764-8

Cited by 12 publications

(8 citation statements)

References 28 publications

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“…Like in many parts in the world, in the Western Cape of South Africa, multiple advantages have been observed from implementing these practices in dryland farming systems. Conservation agriculture practices have been associated with increased soil quality (Swanepoel and Tshuma, 2017), increased water holding capacity, reduced reliance on mineral fertilizers, reduced risk of soil erosion (Meadows, 2003), reduced weed pressure (MacLaren et al, 2018), interruption of pest and disease cycles (Lamprecht et al, 2011), financial risk mitigation and increased profitability (Knott, 2015;Basson 2017). Subsequently, CA adoption levels have been high, particularly for no-tillage and crop diversity (Smith et al, 2017).…”

Section: Core Ideasmentioning

confidence: 99%

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Seed‐Drill Opener Type and Crop Residue Load Affect Canola Establishment, but Only Residue Load Affects Yield

et al. 2019

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Core Ideas Canola establishment can be affected by the residues of the previous crop.Different planting tools may handle crop residue differently.Tine and disc furrow openers at different residue loads were tested.Canola performed best when established with tine openers and when residue load is low. Handling crop residue during planting operations is a challenge to conservation agriculture (CA) farmers worldwide. It remains unclear which tools are most effective in which conditions. Canola (Brassica napus L.), an oilseed crop widely used in rotation with cereals, is particularly sensitive to seedbed conditions, and thus may be influenced by residue loads and the choice of seed‐drill openers. To identify optimal planting practices, this study compared the performance of disc and tine openers on canola establishment, growth, and yield under differing residue loads in a Mediterranean‐type climate region. First, soil disturbance caused by disc and tine openers was evaluated to assess their effect on seedbed conditions; and second, the interacting effects of the openers with different residue loads was investigated. Tine openers and low crop residue loads resulted in the best (P < 0.05) canola establishment. However, canola at reduced plant populations compensated in both biomass and grain yield, so that no yield differences resulted from different opener types, and only small yield differences occurred between residue loads (P > 0.05).

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Section: Core Ideasmentioning

confidence: 99%

“…Cultivating canola every third or fourth year allows farmers to control grass weeds with selective herbicides (Pieterse 2010). Soil-borne disease pressure for cereals is also reduced on fields where crops are rotated with canola (Lamprecht et al, 2011).…”

Section: Core Ideasmentioning

confidence: 99%

Seed‐Drill Opener Type and Crop Residue Load Affect Canola Establishment, but Only Residue Load Affects Yield

et al. 2019

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“…In systematic screening of fungicides in Canada compounds like propiconazole and iprodione prohibited growth of Rhizoctonia solani in vitro (Kataria & Verma, ). There are also several studies on the efficacy of different biological control agents against Rhizoctonia diseases on OSR including Trichoderma species and binucleate Rhizoctonia strains (Verma, ; Lamprecht et al , ). Combining cultural, chemical and biological control methods provides probably the best protection against Rhizoctonia diseases on OSR (Kharbanda & Tewari, ; Lamprecht et al , ) but more studies are required to optimise the most efficient practices in Finnish OSR production.…”

Section: Discussionmentioning

confidence: 99%

Rhizoctonia solaniinjuries in oilseed crops in Finland and impacts of different crop management practices on disease incidence and severity

et al. 2016

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A disease survey in Finnish oilseed Brassica (OSR) fields in 2007-09 revealed the widespread occurrence and several fold increase of necrotic stem base lesions and severely injured blackened roots in comparison to a corresponding survey carried out in 1984-89. Rhizoctonia solani was the predominant fungi detected in the isolations and was followed by several species of Fusarium and Thielaviopsis basicola. In 60% of the samples all three species were detected together. Only the R. solani AG 2-1 strains isolated from OSR and other cruciferous hosts caused damping off or stem base symptoms on turnip rape in a greenhouse experiment. Therefore R. solani AG 2-1 was considered the main pathogen associated with the observed symptoms in OSR crops. Cultural practices changed significantly between the 1980s and 2000s. In the 2007-09 survey there was an increase in the cultivation of oilseed rape instead of turnip rape, increase in the use of no soil or reduced soil tillage and of chemical control of weeds, but a reduction in macronutrient fertilization, especially P and K, when compared to the 1980s survey. The risk for high incidence of stem base lesions and blackened roots was affected by different cultural practices. No tillage and maintaining sufficient soil pH and NPK fertilisation decreased the risk for both types of R. solani induced symptoms. Late sowing date increased the risk for high incidence of stem base lesions, while application of fungicides against Sclerotinia reduced it. The incidence of R. solani damages in many fields was very high in spite of relatively long crop rotations and therefore the average effect of crop rotation in the disease was insignificant. Current turnip rape cultivars are vulnerable to root rot while oilseed rape is vulnerable to stem base symptoms. The higher incidence of R. solani induced diseases could be associated with the decline in productivity of OSR crops in Finland. This study showed that cultural practices such as reduced or no soil tillage, adequate levels of pH and of NPK fertilization could reduce the severity of the symptoms in OSR fields.

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“…Analysis of its ITS rRNA gene sequence characterised Rs37 as belonging to AG 2-1, an AG group shown to cause damping-off of brassica spp. globally (Lamprecht et al 2011). The strain is available on request from AgResearch (contact authors) and will be available from the International Collection of Microorganisms from Plants (ICMP) in due course.…”

Section: Discussionmentioning

confidence: 99%

A bioassay to compare the disease suppressive capacity of pasture soils

Dignam¹,

O’Callaghan²,

Condron³

et al. 2015

NZPP

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Dynamic pathogen complexes can develop under pastures thereby substantially reducing potential productivity Suppression of such pathogen complexes is therefore of great importance and bioassays can quantify disease suppression in soils This study describes the development of a pasturerelevant system Rhizoctonia solani AG 21 induced dampingoff (wirestem) of kale (Brassica oleracea) As kale is not a component of traditional ryegrass clover pasture swards the assay allows assessment of general disease suppression considered more enduring in multiplehostmultiplepathogen systems A pathogenic Rhizoctonia solani isolate was obtained from New Zealand pastoral soil Inoculation of soils with this isolate resulted in a level of dampingoff disease comparable to that induced by reference Rhizoctonia solani isolate Rs0432 Significantly different levels of inoculuminduced disease incidence and progression were found in four distinct pastoral soils In combination with soil physicochemical data and environmental DNA approaches this bioassay can be used to further advance understanding of the influence of farm management practices on disease suppression in pasture soils

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Evaluation of strategies for the control of canola and lupin seedling diseases caused by Rhizoctonia anastomosis groups

Cited by 12 publications

References 28 publications

Seed‐Drill Opener Type and Crop Residue Load Affect Canola Establishment, but Only Residue Load Affects Yield

Seed‐Drill Opener Type and Crop Residue Load Affect Canola Establishment, but Only Residue Load Affects Yield

Rhizoctonia solaniinjuries in oilseed crops in Finland and impacts of different crop management practices on disease incidence and severity

A bioassay to compare the disease suppressive capacity of pasture soils

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