A soil drench will provide a longer residual as it will soak into the plants inner system and last for typically an entire growing season up to 1 year. Foliar application can be somewhat systemic as well but would need to be reapplied after the weather wears away at it on the surface. Per the product label: For Aphid treatment on Shrubs: Soil Drench: Uniformly apply the dosage in no less than 10 gallons of water per 1000 sq/ft as a drench around the base of the shrub, directed to the root zone. Use 1.6oz (1 packet) Criterion 75 WSP per 24-48 ft of cumulative shrub height. There is not a way to mix up less than what the packet states at a time so unless you have a large tank (at least 100 gallons or so) you would be far better off using a liquid Imidacloprid product rather than the extremely hard to use Criterion.
We would recommend Adonis 2F instead for the soil treament. To Apply: Most people use a 5 gallon bucket or a large watering can to apply Adonis as a soil drench. You will need 0.1 to 0.2 fl. oz. (3 to 6 mL) of Adonis 2F per foot of shrub height or 0.1 to 0.2 fl oz per inch of trunk diameter for trees. The amount of water that is used will vary depending on soil conditions and volumes that are easy for applicators to use. The minimum amount of water that should be used is 1 pint per foot of shrub height (or inch of trunk diameter for trees) but you may use 1 quart -1 gallon of water per foot of height (or inch of trunk diameter for trees) as well. Denser soils such as clay do not accept water as readily, so the lower volume of water is suggested. Since sandy soils can accept more water, using the higher volume of water is preferred. After the soil drench has been applied you should water it in with at east 1/2 inch of water. Note: Water simply acts as a carrier and it is important that even distribution of the product is achieved. Thus, more water may be used if the applicator feels runoff will not occur and proper penetration of the root zone is achieved. Insecticides applied to the soil are taken up by the roots and translocated throughout the tree or shrub. Root/soil drenches offer the advantage of requiring no special equipment to apply (other than a bucket or watering can). However, surface layers of organic matter, such as mulch or leaf litter, can bind the insecticide and reduce uptake. Before applying drenches, it is important to remove or pull back any mulch or dead leaves so the insecticide solution is poured directly on the mineral soil. It is also important to keep the soil around the tree or shrub moist for the next 7-10 days after applications to encourage uptake.
You would need to mix 1.6 oz (1 packet) of Criterion 75 WSP Systemic Insecticide in a sufficient amount of water to cover 8,250 to 11,000 sq feet. The amount of water used is not very important. The most import thing is that you evenly distribute the 1 packet over the recommended square footage. For optimal control, irrigation or rainfall should also occur within 24 hours after application to move the active ingredient through the thatch.
Cumulative feet of shrub height is the total height of all shrubs to be treated. This is determined by estimating the height of all individual shrubs in feet and totaling the sum. With this information, you can correctly mix the appropriate amount of Merit needed for the shrub or foliage plant application.
Example: If you have two shrubs that are 2 feet in height and one shrub that is 5 feet in height you would have 9 feet of cumulative shrub height. Measure the Criterion 75 WSP according to the instructions above and apply to the individual shrub according to its own height. For instance if you decided to use 1 gallon of water per foot of shrub height, the shrub that is 5 feet in height would receive 5 gallons of diluted Criterion 75 WSP solution and the shrubs that were only 2 feet in height would receive 2 gallons each of the diluted Criterion 75 WSP solution.
Criterion 75 WSP Systemic Insecticide does need to be mixed with water.
The coverage area of 1 envelope of Criterion 75 WSP will depend entirely on the type of pest you are treating and the area that is being treated. Here are some general guidelines:
While the Criterion 75 WSP is not labeled specifically for kermes scale, it is labeled for soft scale species in general and should yield good results especially if caught in the early life stages of the scale. For trees, use 1 packet per 24-48 inches of trunk diameter in no less than 10 gallons of water per 1000 sq/ft and apply uniformly as a drench around the base of the tree and directed into the root zone.
We apologize, we do not sell Xytect. Criterion WSP is the most popular choice for emerald ash borers. You need 1.4 level teaspoons per inch of diameter. This is the highest rate and should be used for all boring insects. The amount of water that is used will vary depending on soil conditions and volumes that are easy for applicators to use. The minimum amount of water that should be used is 1 pint per inch of tree diameter but you may use 1 quart -1 gallon of water per inch as well. Denser soils such as clay do not accept water as readily, so the lower volume of water is suggested. Since sandy soils can accept more water, using the higher volume of water is preferred. Treatments should begin in May or June and should be done every year to protect trees from the EAB.