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Katherine from Grosse Pointe Shores, Mi writes

What is the application rate for mealy bugs on orchids when using TriStar?

I have a stubborn mealy bug infestation on my small collection of orchids. How much should I use if I use a gallon sprayer? Can that amount be measured accurately with the measuring spout? Should I repeat the application, and if so, after what period of time?


When treating for mealy bugs with the TriStar you will use 7.5 ml (0.25oz, 1.5 tsp) per 3 gallons of water for effective control. The Tristar bottle will measure as low as 5 ml in the built in measuring reservoir. It is suggested that you mix a surfactant with the TriStar when treating for mealybugs for better control. You can use the Non-Ionic surfactant we carry at the rate of 1-2 teaspoons per gallon of water. Do not make more than 4 applications per year. Do not reapply more than once every 7 days. To determine if application is necessary, monitor pest densities.

Answer last updated on: 02/02/2014

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