Avert a spray disaster by using the proper mixing order

What happens when you don’t follow the WALES method for adding pesticide formulations to a tank partially filled with water?

You really can plug up a sprayer, fail to take advantage of good spraying conditions, and waste time cleaning up the mess. At the recent Crop Masters tour at Syngenta Canada‘s Honeywood research facility in Plattsville, ON, Doug Baumann demonstrated what can happen when growers mix up the mixing order.

Baumann, a Syngenta chemist and engineer, mixed Trivapro A and Trivapro B fungicides and Roundup herbicide to demonstrate the importance of proper mixing order. When the WALES method is followed in sequence (wettable powders and water dispersible granules + agitate tank mix thoroughly + liquid flowables and suspensions + emulsifiable concentrate formulations + surfactants/solutions) you get a mixture that is pure and clean. But mixing in the incorrect order can create a buildup of particles that plug your sprayer.

“It’s not a comment on one product or the other, it’s a lesson in WALES,” emphasizes Baumann. “When you follow WALES and put the products in the correct order, you get the dilution you need,” which is key to spray mixtures that perform effectively.

Check out what happens when you mix Trivapro and Roundup in the wrong order in this video.


Bernard Tobin

Bernard Tobin is Real Agriculture's Ontario Field Editor. AgBern was raised on a dairy farm near St. John's, Newfoundland. For the past two decades, he has specialized in agricultural communications. A Ryerson University journalism grad, he kicked off his career with a seven-year stint as Managing Editor and Field Editor for Farm and Country magazine. He has received six Canadian Farm Writers' Federation awards for journalism excellence. He's also worked for two of Canada's leading agricultural communications firms, providing public relations, branding and strategic marketing. Bern also works for Guelph-based Synthesis Agri-Food Network and talks the Real Dirt on Farming.


Wheat prices jump into August — This week in the grain markets

This week, winter wheat prices touched a three-year high, but it didn’t last. Chicago SRW wheat prices for September 2018 gained 5 per cent or about 26 cents US/bushel to close at $5.56. While the December 2018 contract was up 5.4 percent — or nearly 30 cents — to finish a tad under $5.80. In…Read more »


Leave a Reply


This site uses Akismet to reduce spam. Learn how your comment data is processed.