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Scouting and Fungicides

Scouting and Fungicides. Jeff Miller. 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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Scouting and Fungicides

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  1. Scouting andFungicides Jeff Miller

  2. 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

  3. Principles of ScoutingPages 142-144 • Examine every field • Take a directed sample (altered from book) • Sample across the entire field • “Take” enough samples • Keep good records

  4. Fungicides

  5. 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 Agencywww.epa.gov/pesticides/

  6. Think of Fungicides as Crop Medicines

  7. Fungicides for Use in Potato • Soil fumigant • Seed treatments • Soil-applied products • Foliar-applied products • Post-harvest applications

  8. Soil Fumigation – Shank Injection

  9. Soil Fumigation – Chemigation • Chemical injected through water. • Sensitive to drift by wind. • Large buffer zones necessary.

  10. 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)

  11. Seed Treatment Equipment Dust Liquid Examples from Milestone Equipment catalog.

  12. 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

  13. Foliar Applications • Aerial • Airplane • Helicopter • Chemigation • Injection in water • Ground

  14. Foliar Application Comparisons Canopy residue is lower with chemigation, but distribution is more uniform.

  15. 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

  16. Disinfect vs. Disinfest

  17. Miller Research LLC

  18. Ozone

  19. 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.

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