Scouting and Fungicides Jeff Miller. Scouting for Disease Can be used to determine when to apply...
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Scouting and Fungicides Jeff Miller. Scouting for Disease Can be used to determine when to apply fungicides – When needed instead of “just because” Very
Scouting for Disease Can be used to determine when to apply
fungicides When needed instead of just because Very useful for late
blight Not applicable for some diseases Rhizoctonia Pink rot White
mold Early blight
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Principles of Scouting Pages 142-144 1.Examine every field
2.Take a directed sample (altered from book) 3.Sample across the
entire field 4.Take enough samples 5.Keep good records
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Fungicides
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What is a Fungicide? Any substance or mixtures of substances
intended for preventing, destroying, repelling, or mitigating
fungal pests. Definition adapted from the Environmental Protection
Agency www.epa.gov/pesticides/
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Think of Fungicides as Crop Medicines
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Fungicides for Use in Potato Soil fumigant Seed treatments
Soil-applied products Foliar-applied products Post-harvest
applications
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Soil Fumigation Shank Injection
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Soil Fumigation Chemigation Chemical injected through water.
Sensitive to drift by wind. Large buffer zones necessary.
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Potato Seed Treatment Dust, liquid, or both Dust Alder, fir
bark 6% MZ Worker hazard Liquid ST Low volumes (e.g. 4 fl
oz/cwt)
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Seed Treatment Equipment Examples from Milestone Equipment
catalog. Dust Liquid
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Soil-Applied Fungicides Incorporated during row-markout
Broadcast incorporated Banded in the row In-furrow at planting Low
volume (~5 gpa) Banded over the seed piece
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Foliar Applications 1.Aerial Airplane Helicopter 2.Chemigation
Injection in water 3.Ground
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Foliar Application Comparisons ChemigationAerial
Cost/acre$1.50-2.50$7.00-9.00 Spray Volume~ 4500 gallons
(0.10-0.15)5-10 gallons Labor (grower)HighVery low Residue in
canopyLow*High* Estimated usage40-45%45-50% Canopy residue is lower
with chemigation, but distribution is more uniform.
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Post-Harvest Fungicides After harvest, prior to placement in
storage Few fungicides labeled Thiabendazole Phosphorous acid
Disinfectants During storage Applied as a volatilized product
through plenums Disinfectants Phosphorous acid
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Disinfect vs. Disinfest
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Miller Research LLC
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Ozone
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Pesticide Labels When used according to the label, pesticides
will not cause unreasonable harm to the environment. The label is
the law as to how a product can be used.