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Ty from Honolulu, Hi writes,

I have white fly infestation on my golden duranta hedges in Honolulu where it's hot and humid year round....

I was told Merit was the best systemic insecticide to use. Are there any other similar products that you would recommend?


Merit works well because it contains the active ingredient imidacloprid which acts as a systemic insecticide, but as you probably know is also quite expensive. We do carry several other products that contain imidacloprid and will work in the same way as Merit, and they are less expensive. Adonis 75 WSP, Adonis 2F, Dominion 2L, Criterion 75 WSP, Fertilome Tree and Shrub Systemic, and Bonide Systemic Granules. Each of these products will work systemically to help treat for whitefly, but the application and usage rate will vary so you should read the product label of the product you are considering and make sure you are comfortable with the application before purchasing. Systemic products can take several weeks to translocate through a plant. During that time the whiteflies can cause a lot of damage so you should use a product such as Talstar P as a foliage spray to help control the infestation while the systemic product is working its way through the plants.

Answer last updated on: 09/28/2011

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