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Insecticide Per-Acre Restrictions

How to comply with insecticide labels that limit amounts applied to the soil?

In order to protect the ground water there are restrictions on the amount of imidacloprid and dinotefuran that can be applied to the soil in a year. The table below summarizes current restrictions with the maximum inches of DBH allowed to be treated per acre in a single year.

Note that in Indiana, Ohio and Michigan there is a special local needs label (24c) that allows a higher rate of imidacloprid to be applied per acre. When treating larger trees with imidacloprid at twice the rate you can only treat half the number of trees.

Active Ingredient (AI) Application Type Rate Maximum/Acre Max. Inches of Ash Per Acre
    Product/In. DBH (AI) Lbs. AI DBH
Imidacloprid Soil 1.4 to 2.8 g 0.4 128 to 64
Imidacloprid (IN, OH, MI) Soil 1.4 to 2.8 g 0.8 256 to 128
Dinotefuran Soil 6 to 10 g 0.54 82 to 41
Dinotefuran Trunk Spray See Label Not Restricted Unlimited
Emamectin Benzoate (Tree-age) Trunk Injection See Label Not Restricted Unlimited
Azadirachtin (TreeAzin) Trunk Injection See Label Not Restricted Unlimited

Clearly it may be necessary to limit the number of ash trees you can treat on an acre, especially if you are only using soil applied products and if you are also applying these products to other plants (e.g., to kill grubs in turf) on the property. To increase the number of trees that you can treat on an acre you will have to use more than one of the active ingredients and or include products that can be treated with trunk sprays or trunk injections.

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