Apple Scab Management to reduce primary inoculum in leaf litter

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Apple Scab Management to reduce primary
inoculum in leaf litter

• Pathogen survives in leaf litter on orchard floor

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Control of Dutch Elm Disease Sanitation
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Cultural Practices -Focus on inoculum prune
branches with cankers to remove inoculum of
Erwinia amylovora
Cankers provide primary inoculum in spring
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Removing vines mechanically Sets tuber
skins May reduce disease inoculum Makes harvest
easier
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Marketable Yield by Vine Removal 2004
No Vine Removal
Vine Removal
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Verticillium by Vine Removal Fall 2004
Vine Removal
No Vine Removal
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Propane burning of debris for control of
Verticillium wilt in peppermint
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• Poster from 1909

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Rhizoctonia bare patch of wheat
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Pseudomonas syringae on Broccoli raab
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Lettuce drop Sclerotinia sclerotiorum
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Lettuce drop
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Eradication of inoculum in host residue removal,
crop rotation or burial
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Effect of deep plowing on lettuce drop and
spatial pattern of S. minor
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Early leaf spot of peanut Cercospora arachidicola
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Strip tillage
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Early leaf spot of peanut Cercospora arachidicola
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Composting Organic Matter
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Nursery Container Plantssoilborne pathogens
Organic amendments to potting mix
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Bacterial soft rot of potato Erwinia carotovora
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Tuber soft rot caused by Erwinia carotovora in
relation to calcium content From Soilborne Plant
Pathogens Management of diseases with macro-
and microelements (APS Press, 1989)
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Tuber soft rot caused by Erwinia carotovora in
relation to calcium content
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Excessive Available Nitrogen Predisposes Host to
Erwinia amylovora
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Common scab of potato Streptomyces scabies
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Soil moisture deficit
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• Effect of mulch
• on web blight
• caused by
• Thanatephorus
• cucumeris