Merit 75 WP can be used to treat for pecan phylloxera but per the product label, it should be applied as a foliar spray.
Japanese Beetles feed on grass roots until late September when cool soil temperatures cause larvae to move downward into the soil to overwinter. Development is completed the following spring. One generation occurs each year. It is important to start treatment prior to egg hatch. For optimum control when apply Merit 75 WP, irrigation or rainfall needs to occur within 24 hours of the application to move the product through the thatch layer and into the soil. Please refer to the product label for complete application instructions. You can contact your local cooperative extension office to see when egg hatch normally occurs in your region.
Please contact your local cooperative extension office to determine the correct timing of the application as this will vary greatly from region to region.
To use Merit 75 WP on a tree that size, you would need to use 0.7 to 1.4 level teaspoons of the powder per inch of trunk diameter in sufficient water to dilute the product thoroughly and
Merit 75 WP is labeled for the treatment of leafminers on turfgrass, ornamentals, trees, shrubs, flowers, groundcovers, and in and around commercial or residential buildings. You will need 0.7-1.4 level teaspoons per foot of shrub height diluted into at least 10 gallons of water per 1000 sq ft of ground directed at the root base. If the height of the shrub is 5 ft, then you will need 3.5 - 7 level teaspoons of Merit diluted into at least 10 gallons of water, all directed at the root base. If you have more than 1000 sq ft of ground around the root base, the amount of Merit will stay the same but you will use more water to ensure thorough and even coverage. The amount of Merit (3.5 - 7 teaspoons) is determined by how bad your problem is.
Merit 75 WP is not labeled for use on pumpkins, so we cannot give you an application rate to treat these plants.
How much Merit 75 WP you may need to use will depend on the type of plant you are treating (turf, ornamentals, trees, etc.). Keep in mind that this is a systemic product, so it is most important to use the correct amount of product for the area/size plants you are treating rather than a specific amount per gallon of water. You can view full application instructions on the product label here. If you would like to provide more information about your situation, then we would be happy to further assist you.
No, Merit 75 WP does not kill on contact. It is a slower acting product, and that would be the same for any product that had imidacloprid as the ative ingredient.