Host Resistance for Plant Disease Control

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Breeding and development of new cultivars -
Increased production - Decreased production
costs and reduced risk - Increased value
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Deployment of Disease Resistance

• Typically when a cultivar is released for
  commercial production, there is no plan for
  deploying resistances (cultivars tend to be
  limited by their climatic adaptation).

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Deployment of disease resistance - Increase
genetic diversity (decrease genetic vulnerability)
Marshall, D. 1991. Crop Diversity for Plant
Pathogen Control. Pages 569-577 in Handbook of
Pest Management in Agriculture, 2nd Ed.
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Spatial Diversity Intrafield diversity Interfiel
d diversity Regional diversity Temporal
Diversity Variety Rotation Gene
Recycling Species Diversity Crop
Rotation Intercropping
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Disease spread Intrafield diversity Mixtures or
Blends of existing cultivars Species mixtures
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Intrafield diversity
Species blends for forage
Sorghum variety blend
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Interfield diversity
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Regional gene deployment
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Multiline Varieties A composite of genetically
identical lines except each possesses a different
gene for resistance - "dirty vs. clean" -
advantages and disadvantages
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Intercropping
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