As far as we know there are no known insecticides that will work on Ground Pearl. Ground Pearl is a type of hearty armored scale, and other than natural enemies like ants, no true solution is available. The best solution to try is to reduce plant stress by following recommended fertilizing and irrigation recommendations to enable turfgrass to tolerate the damage. You may also want to contact your local Cooperative Extension office to see if they have any recommendations.
Merit 2F Insecticide is mixed at 1.5 fl oz per 100 gallons for treating Japanese Beetles with a foliar application.
If Merit 2F Insecticide has separated, you can try to shake it to mix it back up prior to use. If the product stays separated, or if it became frozen at any point, you will need fresh product.
It is not recommended to apply Merit 2F Insecticide during rain. Normally as long as an insecticide like Merit 2F has had at least 6 hours of dry time after it has been applied, then it is considered rain fast to most rain conditions that would come afterwards. If it rained as early as 4 hours after application you may need to reapply.
Merit 2F Insecticide is labeled for basal system applications for listed insects however Safari 20SG Systemic Insecticide with Dinotefuran would be a better option for basal bark treatments. Please review page 15 on the product label for detailed instructions on basal bark sprays for listed insects.
Merit 2F Insecticide can typically last 1 year but some users apply twice in a year as a soil drench to plants/trees. It depends on the growth of the plants/trees you are applying to. Bayer Advanced 12 Month Tree/Shrub Insect Control contains the same active ingredient but is consumer grade so not as strong as Merit which is professional grade.
Merit 2F Insecticide is not labeled to be used as a tree injection so we cannot recommend it be used in any type system. It is safe as a soil injection, drench or broadcast when applied as directed on the product label.
Typically when treating an evergreen hedge made up of shrubs you would do 0.2 oz of Merit 2F Insecticide per foot of shrub height, so for each individual plant along your hedge that is 6 feet tall you would use 1.2 oz (35 ml) in a sufficient water volume to give a good soil drench coverage. On average you use 5-10 gallons of water per 5 feet of shrub length to ensure the product gets moved into the root zone completely. If for instance you have 2, 6 foot shrubs in a 5 foot length area, you would use 5-10 gallons of water along the root system at the base of the hedge with 2.4 oz (71 ml) of Merit mixed in to that water volume. If you are planning to spray the whole hedge down rather than do a root/soil drench, then the label calls for 1.5 oz per 100 gallons of water.
According to the product label, the best time to apply the Merit 2F Insecticide for optimum grub control make applications prior to egg hatch of the target pest. We suggest to contact your local cooperative extension office in your county for more specific times of application.
On page 12 of the product label: Apply Merit 2F Insecticide at a rate of 0.1 to 0.2 fl oz (3 to 6 mL) per foot of shrub height. Soil drench applications are made by adding the needed amount of concentrate into a gallon or two of water and evenly applying it around the shrub, followed by more water using no less than 10 gallons of water per 1,000 sq. ft. Please read the product label to ensure it can help control the pest(s) you are treating for and for complete application instructions.
Merit 2F is only labeled to be used on grapes for leafhoppers and mealybugs. Per the product label the rate is 1.5 fl oz per 100 gallons, this breaks down to about 0.015 oz per gallon. If you need to treat for anything other than the listed pests we would recommend ImidaPro 4SC which is labeled for a few other pests. If you need to treat for any other pest not listed on the label we suggest you contact your local Department of Agriculture to find the best solution for you.