Effect of Potash Deficiency on Host Susceptibility to Cochliobolus sativus Causing Spot Blotch on Wheat

Vergnes, D. Mercado; Renard, Marie Éve; Duveiller, E.; Maraite, Henri

doi:10.1007/1-4020-5497-1_35

Cited by 1 publication

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“…In these soils, applying 30 kg ⁄ ha of K 2 O produced grain yields comparable with those in fungicide-protected plots without K (Sharma et al, 2005b). The positive effect of K 2 O on reducing spot blotch severity was confirmed in controlled conditions using a standard half-strength Hoagland solution with three different levels of potassium (Mercado Vergnes et al, 2007). This underlines the importance of applying K 2 O in deficient soils to reduce grain yield losses resulting from spot blotch when fungicide is either unavailable or too costly, a situation that is common among resource-poor farmers in the Eastern Gangetic Plains of South Asia.…”

Section: Adequate Fertilization Reduces Wheat Vulnerability To Spot Bmentioning

confidence: 66%

Genetic Improvement and Crop Management Strategies to Minimize Yield Losses in Warm Non‐traditional Wheat Growing Areas due to Spot Blotch Pathogen Cochliobolus sativus

Duveiller

Sharma²

2009

Journal of Phytopathology

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Spot blotch caused by Cochliobolus sativus emerged as a major threat to wheat production in the warmer nontraditional wheat growing areas in the late 1980s. This foliar disease causes significant yield losses annually (15-20% on average in South Asia) endangering the livelihoods of millions of small farmers. Effective measures in the field are needed to mitigate the impact of spot blotch on food security in affected areas. This review summarizes the global knowledge on genetic improvement and crop management strategies to minimize yield losses based on latest field research. Recent studies have shown that spot blotch severity is highly influenced by stress factors affecting crop physiology which in turn affects host tolerance and resistance to the pathogen. Soil nutrient and water stress aggravate spot blotch-induced grain yield losses. Heat stress which is gradually increasing in Asia causes higher levels of disease damage. Genetic improvement is the cornerstone of a sustainable control of spot blotch in all affected regions. Resistance is essentially based on Chinese and South American sources and inter-specific crosses with broadly adapted semi-dwarf germplasm. A list of genotypes consistently reported in the last 10 years to harbor at least partial resistance to spot blotch, along with their inheritance of resistance, has been compiled to help breeding programmes. As the fungus is aggressive under conditions of high relative humidity and heat which in turn influences plant susceptibility, a synthesis of the different tools for scoring disease severity is given. Because resistance is incomplete, the ultimate goal is the accumulation of minor genes of resistance in adapted high yielding genotypes. This paper shows how the use of resistant varieties, timely seeding, adequate fertilization, crop rotation, and the judicious use of fungicides can be part of an integrated management strategy for controlling yield losses due to spot blotch.

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Section: Adequate Fertilization Reduces Wheat Vulnerability To Spot Bmentioning

confidence: 66%

Genetic Improvement and Crop Management Strategies to Minimize Yield Losses in Warm Non‐traditional Wheat Growing Areas due to Spot Blotch Pathogen Cochliobolus sativus

Duveiller

Sharma²

2009

Journal of Phytopathology

View full text Add to dashboard Cite

show abstract

Effect of Potash Deficiency on Host Susceptibility to Cochliobolus sativus Causing Spot Blotch on Wheat

Cited by 1 publication

References 8 publications

Genetic Improvement and Crop Management Strategies to Minimize Yield Losses in Warm Non‐traditional Wheat Growing Areas due to Spot Blotch Pathogen Cochliobolus sativus

Genetic Improvement and Crop Management Strategies to Minimize Yield Losses in Warm Non‐traditional Wheat Growing Areas due to Spot Blotch Pathogen Cochliobolus sativus

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