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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.

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Presentation on theme: "Scouting and Fungicides Jeff Miller. Scouting for Disease Can be used to determine when to apply fungicides – When needed instead of “just because” Very."— Presentation transcript:

1 Scouting and Fungicides 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 Scouting Pages 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

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 Agency

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 Examples from Milestone Equipment catalog. Dust Liquid

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 1.Aerial – Airplane – Helicopter 2.Chemigation – Injection in water 3.Ground

14 Foliar Application Comparisons ChemigationAerial Cost/acre$ $ Spray Volume~ 4500 gallons ( ”)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.

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

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19 Miller Research LLC

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22 Ozone

23 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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