Dylox 420 SL Insecticide would only help you with the grub issue and if they are actively feeding, it is not labeled for bill bugs. The best time of treatment for billbugs is the same as the grubs, before they hatch so usually in the spring time is best. We would recommend Merit Insecticide Granules for an early treatment and you can contact your local cooperative extension office if you're not sure when billbugs or grubs hatch in your region. When adult billbugs are first seen, Talstar P (Bifenthrin) or Tempo SC Ultra (Beta-Cyfluthrin) can help. We recommend to look over our billbug treatment guide for further information.
The amount of Dylox 420 SL Insecticide will depend on the what you are treating for. For most pests, such as cutworms, armyworms, chinch bugs, etc., the mixing ratio is 4.6-6.9 fl. oz. per gallon of water. This will treat 1000 square feet. For mole crickets, the mixing ratio is 6.9 fl. oz. per gallon of water. This will also treat 1000 square feet.
We would advise to apply Dylox 420 SL Insecticide within 24-48 hrs within any rainfall before or after, mixing at the recommended rates so that the material can leave the residual to be effective for eliminating the taregted pests in the area.
Dylox 420 SL Insecticide will not harm the lawn in any way even if it's a new seed. Dylox only last for 48 hours and is designed to knock back heavy populations of grubs and other pests in the lawn that are already heavily feeding on the lawn and doing damage. You would base when to put it down by how bad of a problem you have and how quickly you want to start killing off the insects in the soil that are feeding on the grass and roots.
We sell many products labeled for prevention and treatment of grubs. Dylox does comes in the SL (soluble liquid) but also in a Granule. The granule formulation is better for smaller areas. Keep in mind that Dylox is an immediate curactive treatment only, not a preventative treatment for grubs. Carbaryl products have changed to a different active ingredient, but the new formulation of Sevin Granules is labeled to treat for actively feeding grubs at the highest application rate.
You can browse all our White Grub treatment products here. We have products with all the active ingredients you mentioned. We are happy to answer any other questions about products that you may have.
Dylox 420 SL Insecticide is best product for third instar grubs because it works later in the season and provides a longer effective application window. It should be applied when they are actively feeding, so whatever time in your area that is, is when you should apply. Using Dylox will not directly get rid of your digging animal problem though, such as moles. When you have digging activity in your yard it can in part be due to a plentiful food supply. Pests such as Moles will feed on grubs, worms and other similar insects living in your turf. Many people will use a product like Dylox to kill the grubs and insects the moles are feeding on in conjunction with using products designed to either trap, kill, or repel moles. (Moles' primary food source is earthworms, not grubs.) By removing their food source it helps deter them from your yard. We have a great guide here for grubs as well.
Dylox 420 XL Insecticide is the product we would recommend to treat an active infestation and it will work as long as the grubs are actively feeding. You will use 4.6 – 6.9 oz per 1,000 square feet.
Yes, for white grub control, you should use 6.9 fl oz of Dylox 420 SL Insecticide per 1000 sq ft in sufficient water. 1 Acre is 43,560 sq ft, so for 2.5 Acres, you would use a total of 751 oz of Dylox SL to treat that entire area.