Merit 75 WP - Questions & Answers

As stated on the product label, the rate of Merit 75 WP for aphids is 0.25 tsp per 2.5 gallons of water. Please be sure to review the product label for more information and complete application instructions.

When using Merit 75 WP applications cannot exceed a total of 8.6 oz (0.4 lb of active ingredient) per acre per year. 

Merit should be applied when the tree is actively growing. If you try to apply a systemic product like Merit to the root system when the tree has gone dormant it will not be able to trans-locate through the tree. Instead you should consider using a topical product such as Tengard to stop new insects from invading the tree. Tengard can be sprayed on the bark and the foliage to kill exposed insects before they invade the tree.

Per the product label: You would mix Merit 75 WP  at the rate 2 oz per 30 cumulative feet of shrub height.  Soil Drench: Uniformly apply the dosage in no less than 10 gallons of water per 1000 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 solution from reaching the root zone.

Per the product label for Merit 75 WP - 2 oz.: Applications should not be made when turfgrass areas are waterlogged or the soil is saturated with water.   Adequate distribution of the active ingredient cannot be achieved when these conditions exist.   For optimum control, irrigate thoroughly to incorporate MERIT 75 WP Insecticide into the upper soil profile after application.  The pH of the water is not important.

Merit 75 WP - 2 oz. jar will treat scale insects. You can apply this product as a soil injection or soil drench around the base, for the root system to soak up and translocate up. Please refer to the Merit 75 Wp product page, as we have listed the applications to trees and shurbs. Also, be sure to refer to the product label for application as well.

Merit 75 is not actually labeled for squash bugs, but squash bugs that try to feed off of treated plants would surely be affected. Merit 75 is most likely not labeled for squash bugs because it cannot be used on most edible plants which are the ones that will most likely be infested by this pest. We do carry Bayer Advanced Fruit, Citrus and Vegetable Insect Control and while it does share the same active ingredient as Merit 75 the formulation is a bit different which is what allows you to use it on edible plants.

Merit 75 WP is not labeled for bagworms and may not provide you with satisfactory results. We recommend that you choose a product that lists bagworms on the product label such as Talstar P (Talstar P is the product most commonly selected by pros for bagworm control), Thuricide, Mavrik, or Permethrin SFR. Please take a few minutes to read our article Bagworm Control to learn when you should start spraying for bagworms.

Adult Japanese Beetles can be treated with Merit 75 WP by spraying the trees. When you apply it systemically, you need to be able to apply the right amount of product per area with enough water, therefore using the product inside the Ross Root Feeders will not be a good idea. Please refer to the product label for Merit 75 WP for complete application instructions. For more information about treating this pest, view our Japanese Beetle Control page.

The effects when Merit 75 WP - 2 oz. jar is applied off-label will be determined by many different variables.  Please contact Bayer at 800-331-2867 for further assistance in this treatment.

Merit 75 is not labeled for nematodes so we are not sure if it would provide any type of control for this pest. We would recommend contacting your local cooperative extension office to seek further information on the type of nematode that is infesting certain plants on your property. In most situations you can manage nematode populations without any type of chemical control.