Web site - Mixing oil and pesticide

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Mixing oil and pesticide

Tank-mixing oil and pesticides necessitates some special precautions. To prevent oil-pesticide combinations from separating, or "buttering out" a surfactant may be added. Check the label for rates, mixing instructions, and when to add to the sprayer tank. Add the pesticide when the tank is one-half to two-thirds full, and add the oil last. The spray tank must be clean because residues from the previous tank of spray may cause the emulsion in the oil to separate. Rinsing the tank with water after each load may help minimize the problem. Buildups of the "butter" can be removed by using a heavy duty cleaner or low-flammable solvent and by vigorous agitation. Dissolving the buildup may require up to 20 minutes.

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