When mixing more than one pesticide to the spray tank, add the materials in the following order?

• A. WS, WPs, ECs, Flowables
• B. WPs, Flowables, WS, ECs
• C. WPs, ECs, Flowables, Water Solubles (WS)
• D. WPs, WS, ECs, Flowables

Answer: (B)

Mixing order matters because some pesticide forms are harder to disperse or can destabilize others if added too early. WPs and Flowables are dry formulations that need thorough wetting and dispersion in the tank. By adding them first, you ensure they become properly wetted in the water before anything else is introduced. Water-soluble products should be added after those solids have been wetted so they can dissolve evenly without trapping undissolved particles. Emulsifiable concentrates are more likely to cause compatibility problems or form unstable mixtures if added too soon, so they are added last to minimize interactions with the earlier formulations. This sequence—WPs first, Flowables next, Water Solubles, then Emulsifiable Concentrates—helps achieve a uniform, stable mix and reduces the risk of nozzle clogging or separation. Always follow label directions and keep constant agitation.