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The Syngenta Field Report features information and experts from Syngenta sharing observations about issues growers are dealing with in the fields.

Tank mixing: Antagonism and synergy

Apr 27, 2010
Gordon Vail

Tank mixes are becoming more common during spray season, thanks to a variety of factors. Weed resistance, disease and insect pressure, fuel costs, large numbers of acres to cover, weather delays and more all provide reasons to put multiple products in a spray tank.
 
The question is do you know how the products in the tank will impact the performance of the others? 
 
For example, we have research showing synergy between mesotrione and atrazine when combined – meaning the combinations is more effective on weeds than expected. However, we also know that in wheat, adding a fungicide to the herbicide application can result in leaf burn. Although crops often grow out of such injury, you should know what to expect.
 
 
At the same time, antagonism, or reduced activity from the individual components of the combination, can also be a problem. You may not get the control you expected in some cases.
 
Crop injury is a common concern, and one that was brought up at a Commodity Classic discussion. The Maryland grower on the panel, Mike Flanary, the Syngenta Farming for Future award winner, said that he relies on online resources like www.farmassist.com to find out what products can be combined and how they might affect his crop. You can also check with your retailer or crop consultant, to make sure you know what to expect from what you put in your tank.
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