Laura from Denair, Ca writes
I have four maple trees that are infested with aphids. I have always used Merit WP and was very happy with the results. How does the WP and 2F compare both in results and cost?
Both Merit 2F and Merit 75 WP are systemic concentrates containing the active ingredient Imidacloprid. Merit 2F is a liquid concentrate (Flowable) with 21.4% active ingredient, while Merit 75 WP is a Wettable Powder containing 75% active ingredient. When using Merit 2F, use 0.1 to 0.2 fl. oz. of concentrate per inch of trunch diameter, per the product label. You will then uniformly apply the dosage in no less than 10 gallons of water per 1,000 square feet as a drench around the base of the tree, directed to the root zone. Remove plastic or any other barrier that will stop the solution from reaching the root zone. When applying Merit 75 WP, use .7 to 1.4 level teaspoons per inch of trunch diameter, or 1 to 2 ounces per 30 cumulative inches of trunk diameter, and apply the same way as the Merit 2F, according to the product label. If you have many trees to treat, Merit 2F would be more economical. If you only have a few small trees, then the Merit 75 WP 2 oz. jar would probably be enough product for you.
Answer last updated on: 08/17/2015
