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Lindsay from Tracy City, Tn writes

What is the mix rate to treat hemlock woolly adelgid using Safari 20SG?

What is the mix rate of this product please for a 4 gallon spray container. How many inches from the base of the tree do I spray? How many times do I go around the tree when I do spray? A couple times around per tree? How many times does this need to be completed-yearly?


Per the product label for Safari 20SG Systemic Insecticide with Dinotefuran when using as a basal trunk spray to treat Hemlock Wooly Adelgids:  You use12-24 oz per gallon Depending on bark type and thickness, one gallon of spray solution will typically cover 65-85” of cumulative trunk diameter (1.5-2.0 fl oz per inch of trunk diameter) when applied to trunk between soil surface and 4-5 feet above soil surface.  When sprayed on the trunk, Safari 20 SG Insecticide will be absorbed through the bark and into the vascular system, and then transported throughout the tree. Speed of control will be dependent on tree size, tree health, environmental conditions and how actively pests are feeding. In actively transpiring trees, control may be evident within 1-3 weeks after application. Spray bark on root flare (buttress roots) and on trunk between soil surface and 4-5 feet above the soil surface. Adjust nozzle to uniformly distribute spray over the entire circumference of the tree trunk and buttress roots. Wet bark just to the point of saturation and run off onto soil. Apply ONLY with a low volume sprayer operated at less than 20 PSI to prevent tree damage, bounce back and drift of spray droplets. Time applications to coincide with when most vulnerable pest life stage is present on plants. Do not apply to wet bark, during rainfall or if rain is expected within 12 hours. Control may be less effective in trees with thick bark, and at times when trees are not actively growing or transpiring.

Answer last updated on: 11/18/2019

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