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Hort 375: Planting for a Greener World
Growing Healthy PlantsBasics in Plant Disease Management
Brian D. Hudelson
Department of Plant Pathology
University of Wisconsin-Madison/Extension
• Anything that you can do to reduce the impact of disease
• Integrated with other types ofmanagement
Plant Disease ManagementDefinition
• First step in successful management
• Recognition that something is wrong
• Detective work to figure out what happened and whysomething happened
Plant Disease ManagementDiagnosis
Plant Disease ManagementThe Disease Triangle
Susceptible Host
PathogenFavorableEnvironment
Disease
NoDisease
NoDisease
NoDisease
NoDisease
NoDisease
NoDisease
• Resistance
• Exclusion
• Protection
• Eradication
• Avoidance
• Therapy
Plant Disease ManagementR-E-P-E-A-T
• Using a plant’s natural ability to fend off disease
Plant Disease ManagementResistance
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• Resistance is NOT universal!
Plant Disease ManagementResistance
• Resistance is NOT immunity!
Plant Disease ManagementResistance
• Resistance can depend on plant “age” and plant part!
Plant Disease ManagementResistance
• Resistance effectiveness can depend on the weather!
Plant Disease ManagementResistance
+ =
• Resistance may not be equally effective in all locations!
Plant Disease ManagementResistance
vs.
• Resistance is sometimes NOT forever!
Plant Disease ManagementResistance
+ =
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• Resistance is not everything you may need in a plant!
Plant Disease ManagementResistance
• Resistance is not always good!
Plant Disease ManagementResistance
vs.
• Preventing introduction of pathogens into you garden
Plant Disease ManagementExclusion
• Buy healthy plants!
Plant Disease ManagementExclusion
• Buy healthy seeds!
Plant Disease ManagementExclusion
• Limit soil movement!
Plant Disease ManagementExclusion
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• Limit other pathogen introductions!
Plant Disease ManagementExclusion
• Decontaminate, decontaminate, decontaminate!
Plant Disease ManagementExclusion
• Applying materials to prevent infections by pathogens from occurring
Plant Disease ManagementProtection
• Use as a last resort!
• Read pesticide labels!
• Use proper rates!
• Apply at the right times!
• Wear appropriate clothing!
• Alternate active ingredients!
• Get training!
Plant Disease ManagementProtection
• Getting rid of pathogens once they have arrived in your garden
Plant Disease ManagementEradication
• Do good fall clean-up!
Plant Disease ManagementEradication
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• Prune diseased branches!
Plant Disease ManagementEradication
• Remove entire plants!
Plant Disease ManagementEradication
• Control alternate hosts!
Plant Disease ManagementEradication
• Control weeds!
Plant Disease ManagementEradication
• Rotate, rotate, rotate!
Plant Disease ManagementEradication
• Decontaminate, decontaminate, decontaminate!
Plant Disease ManagementEradication
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• Manipulating how you grow your plants to prevent conditions favorable for disease
Plant Disease ManagementAvoidance
• DO NOT plant susceptible plants where a known disease exists!
Plant Disease ManagementAvoidance
• DO NOT plant too early or too deeply!
Plant Disease ManagementAvoidance
• DO NOT plant too densely!
Plant Disease ManagementAvoidance
• DO NOT water too much!
Plant Disease ManagementAvoidance
• DO NOT use sprinklers to water!
Plant Disease ManagementAvoidance
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• DO NOT water, heat or nutrient stress plants!
Plant Disease ManagementAvoidance
• Eliminating pathogens from infected plants
Plant Disease ManagementTherapy
• Figure out what diseases you have
• Figure out what management techniques work
• Integrate your disease management with other management needs
• DO NOT expect perfection
• Enjoy growing your plants(including the diseases)
Plant Disease ManagementPutting It All Together
Plant Disease ManagementWhere to Go for Help
Plant Disease Diagnostics ClinicDepartment of Plant Pathology
University of Wisconsin-Madison1630 Linden Drive
Madison, WI 53706-1598(608) 262-2863
[email protected]://pddc.wisc.edu
Follow on Facebook and Twitter @UWPDDC
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