Weed Science Information (Row Crops/Vegetables) for County Extension Agents
Friday, July 26, 2013
Reflex/Glyphosate Compatibility Issues in Soybeans (Prostko)
Just a quick reminder that there have been a few issues regarding tank-mixtures of glyphosate and Reflex. Generally, some K-salt formulations of glyphosate have not mixed well with Reflex. In order to prevent incompatibility problems, please refer to the following Syngenta document:
Monday, July 15, 2013
A Few Thoughts About Peanut Tank-Mixtures (Prostko)
The wet weather has caused significant spray delays for most peanut growers. Consequently, they are now considering tank-mixtures of any and all chemicals to reduce trips across the field. Over the last few days, I have had numerous questions about tank-mixing Select (clethodim) with other agri-chemicals. Here are a few things to consider:
1) Tank-mixtures of Select (or any other grass herbicide) + Cadre should be avoided due to the fact that reduced grass control will occur (Figure 1). The grass herbicide should be sprayed first and then followed a minimum of 3 days later by the Cadre. This antagonism is a result of the Cadre reducing the photosynthetic rate of the grass which reduces the sensitivity of the grass plant's ACCase enzyme to Select.
2) Results from an older multi-state (GA, NC, TX) research project suggested that when 2,4-DB is tank-mixed with a postemergence graminicide, grass control can be reduced 8-15% approximately 45% of the time (York et al. 1993. Peanut Science 20:57-61).
3) For optimum grass control, it not a great idea to mix POST grass herbicides with a fungicide due to the increased potential for antagonism. Generally, Abound, Bravo WS, Headline, and Folicur have all reduced grass control at some point when tank-mixed with POST grass herbicides. When a grass/fungicide interaction has occurred, grass control has been reduced by as little as 3% (Poast + Bravo WS - large crabgrass) or as much as 45% (Select + Bravo WS - large crabgrass). It all depends upon the grass species and fungicide used. Way too many what if's and maybe's for me to remember.
4) New and seasoned county agents might benefit from reviewing the following publication: Tank-Mixing Chemicals Applied to Peanut Crops: Are the Chemicals Compatible?
http://www.peanut.ncsu.edu/pdffiles/004993/tank_mixing_chemicals_applied_to_peanut_crops.pdf
1) Tank-mixtures of Select (or any other grass herbicide) + Cadre should be avoided due to the fact that reduced grass control will occur (Figure 1). The grass herbicide should be sprayed first and then followed a minimum of 3 days later by the Cadre. This antagonism is a result of the Cadre reducing the photosynthetic rate of the grass which reduces the sensitivity of the grass plant's ACCase enzyme to Select.
2) Results from an older multi-state (GA, NC, TX) research project suggested that when 2,4-DB is tank-mixed with a postemergence graminicide, grass control can be reduced 8-15% approximately 45% of the time (York et al. 1993. Peanut Science 20:57-61).
3) For optimum grass control, it not a great idea to mix POST grass herbicides with a fungicide due to the increased potential for antagonism. Generally, Abound, Bravo WS, Headline, and Folicur have all reduced grass control at some point when tank-mixed with POST grass herbicides. When a grass/fungicide interaction has occurred, grass control has been reduced by as little as 3% (Poast + Bravo WS - large crabgrass) or as much as 45% (Select + Bravo WS - large crabgrass). It all depends upon the grass species and fungicide used. Way too many what if's and maybe's for me to remember.
4) New and seasoned county agents might benefit from reviewing the following publication: Tank-Mixing Chemicals Applied to Peanut Crops: Are the Chemicals Compatible?
http://www.peanut.ncsu.edu/pdffiles/004993/tank_mixing_chemicals_applied_to_peanut_crops.pdf
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