Pyrethrin is also a good flushing agent when used at a concentration of one to three percent in water. The formulation selected, as well as the specific insecticide chosen, determine the level of control. For example, bait formulations are superior in spring and fall for mole cricket control, whereas summer treatments with sprays or granules give better control. Spray applications of insecticides provide the highest degree of control within the first 24 - 48 hours after application. In general, the initial control with granular treatments is less than that from sprays.
Insecticidal activity begins only when the granule absorbs moisture and releases the insecticide.
For specific insecticide recommendations on turf consult your County Extension Agent. Correct Application Methods Application methods are extremely important in turf insect control. The homeowner may use the most effective insecticide available, but if the method of application is poor, the level of insect control will be disappointing. To control insect pests living in the soil, the target zone for the insecticide should be the soil at the root zone. Liquid and granular formulations must be watered in sufficiently to move insecticide off the surface, through thatch, and to the root zone.