Yes, Merit 2F is labeled for suppression of Armored Scale. According to the product label, the mix rate is 0.1 to 0.2 fl oz per inch of trunk diameter (D.B.H) and can be applied by either soil injection or soil drench. Please refer to the product label for instructions.
Yes, you could apply a systemic product such as Merit 2F Insecticide as foliar sprays only help when they are in certain stages on the hackberry tree. The sytemic product would normally take a couple of weeks to translocate all the way through the tree, so a foliar spray may help in the mean time until the product works its way through the center. We highly suggest using it again before symptoms start to appear to prevent your trees damage the next year. Adult psyllids emerge from galls in September and can be annoying to people living near infested trees. Psyllids will swarm to houses, particularly light-colored ones, in search of protected locations to pass the winter. When the weather warms up, they come out of dormancy and become a nuisance. They do not bite humans or pets.
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.
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.
