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Jar Testing

1. Add 1 pint (.50 L) of the carrier (water or liquid fertilizer) to each of two one-quart (1.0L) jars. (Note: Use the same source of water that will be used for the tank mix; and conduct the test at the same temperature as the spray mixture.)

2. To one of the jars, add 0.25 teaspoon (1.0 ml) of the compatibility agent. To both jars, add the appropriate amount of pesticide(s), in their relative proportions, based on recommended label rates. If you use more than one pesticide, add them separately with dry formulations first, flowable next, and emulsifiable concentrates last. After each addition, shake or stir gently to thoroughly mix.

3. When you add all ingredients, put lids on and shake both jars for fifteen (15) seconds and let stand for thirty (30) minutes or more. Then inspect the mixture for flakes, sludge, gels, heavy oil films, or other signs of incompatibility.

  • If, after standing for thirty (30) minutes, the components in the jar containing no compatibility agent are in dispersion, the herbicides are compatible and there is no need for a compatibility agent.

  • When the components are in dispersion only in the jar containing the compatibility agent, the herbicide is compatible only if adding a compatibility agent.

  • If either mixture separates and you can remix it, the mixture can be sprayed as long as good agitation is used.

  • If the components are not dispersed or show signs of incompatibility in either jar; the herbicide-carrier mixture is not compatible and you shouldn’t use it.


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