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Example Fungicide Program for 2020

I hope you all are staying safe amid the coronavirus concerns out there right now. Unfortunately as many of you know we have had to cancel our last four county meetings of the year (Wilcox, Jenkins, Brooks, and Dougherty) as well as the Georgia Pecan Growers Assoc. Conference. We will be getting the county meeting presentations up on our website soon. I will send out a quick blog post to provide the link for those if you need them.

Usually this time of year, as bud break is nearing (I began to see budbreak on Cape Fear last week), I send out an example fungicide program. Again, there are many such programs that one could put together. Based on Dr. Tim Brenneman’s research results, I feel that the following would be good choices. You will see one program for highly scab susceptible varieties (think Desirable, Pawnee, Cunard) and another for more moderately susceptible varieties.

The important thing to remember is to rotate chemistries and use the fungicides to their strengths. Group 3 + Group 11 materials are excellent on leaf scab when combined and work well on nut scab too. Phosphites make a great leaf scab material and can be used alone at the 2 qt rate. Miravis Top is a superb new material that provides an additional chemistry to throw in the mix and should be focused on nut scab. Elast and Tin both work better on nut scab than on leaf scab and when combined are an excellent choice for nut scab.

Program for Highly Scab Susceptible Varieties

Absolute

Phosphite (2 qt/acre rate)

Absolute

Phosphite (2 qt/acre rate)

Miravis Top (this should be about the time nut sizing begins)

Elast/Tin

Miravis Top

Elast/Tin

Miravis Top

Elast/Tin

(Continue with Elast/Tin or rotate with Absolute if additional sprays needed beyond this point.)

Moderately Susceptible Varieties

Phosphite (2 qt rate)

Absolute

Phosphite (2 qt rate)

Group 3 +Tin

Absolute (or Miravis Top if pressure is high)

Tin (full rate)

Group 3 + Tin (or Elast/Tin if pressure is high)

Tin (full rate)

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Lenny Wells

About Lenny Wells

I am a Professor of Horticulture and Extension Horticulture Specialist for pecans at the University of Georgia. My research and extension programs focus on practical cultural management strategies that help to enhance the economic and environmental sustainability of pecan production in Georgia.