Georgia Peanuts: Tank-Mixes and Herbicide Injury – 3 Tips

Photo: University of Georgia

Last week, I received a few calls and pictures from some folks about tank-mixes and peanut injury (Figures 1 and 2).  I will remind you that there is nobody on the planet that can assure any peanut grower that a tank-mix will be 100% safe and 100% effective all the time.

There are too many variables to consider including the number of products in the spray tank, GPA, air temperature, humidity, leaf wetness, overall peanut plant health, and time of day. I think part of the problem last week was our higher than normal temperatures (Figure 3).

A few tips for growers considering spraying untested tank-mixes:

  1. Limit the number of products that are put in a spray tank.  Bite the bullet and make separate applications when practical.
  2. Spray early in the morning when air temperatures are lower and the peanut plants have not been baking in the sun all day.
  3. Increase water volumes from 10 GPA  to 15 GPA (less concentrated spray droplets).

Figure 1. Peanut response to Convoy + Alto + Bifenthrin fb Select + COC 1 hour later (i.e. really a 5 way tank-mix)

Figure 2. Peanut response to Propulse + 2,4-DB (i.e. really a 3 way tank-mix)

Figure 3. Maximum air temperatures, Attapulgus (GA), June 30 to July 7, 2015, 2016, 2017 (Source: UGA Automated Weather Network)

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