Demon WP Insecticide - Questions & Answers

Demon WP will last for about 30 days or more once applied from a sprayer.  Once mixed, Demon WP should be applied and none kept if your sprayer as a mix.  Since Demon WP is a wettable powder, if you store it in your sprayer for more than a week it will start to settle and can clog the hose or nozzles to your spray device.   You should always only mix what you can apply right then.

Yes, Demon WP Insecticide is labeled for wasps.  It will be effective for the control and erradication of wasps, as long as the wasps come in contact with the product.   

Demon WP does not provide an instant knockdown of insects even if the insects are sprayed directly. You will see results over the next couple of days as the roaches come into contact with the treated areas and receive a lethal dose of the insecticide and they then succumb to the effects of the product. It is very important that you read and follow the product label to avoid contaminating sensitive areas. You can use a high quality roach bait gel such as the Advion Roach Bait Gel to treat areas where spraying would not be appropriate (counter tops, cabinets, drawers). The roaches will consume the bait and then go back to their nesting area and spread the bait which will help eliminate the roaches more quickly than spraying insecticides and IGRs alone. Getting rid of roaches is not a process that only takes only a few hours. Moderate roach infestations can take a few weeks to get rid of and severe infestations can take several months even when using all of the products needed (insecticide, IGR, roach bait) and sanitation is up to par.

You should not need to spray indoors more than once a month for roach control if you are using Demon WP. Using Demon WP alone will not stop roaches from breeding and laying eggs. We recommend that you use an IGR (insect growth regulator) such as Gentrol to help stop juvenile roaches from reaching sexual maturity. We also recommend that you use a roach bait gel such as Advion Roach Bait Gel in cabinets, around counter tops, in drawers and around appliances to get rid of the roaches that hide in places that cannot be sprayed. By using all three products together, you will have a roach control program that will effectively get rid of your roach infestation. We offer all three products together in our Roach Control Kit #2. How long it will take to get rid of the infestation will depend on how heavy the infestation is and how good the sanitation is in your home. You can expect it to take 6 weeks to several months.

Demon WP Insecticide needs to be used within 24 hours of mixing with water.  In the original envelope it has a 5 year shelf life if kept out of extreme temperatures and direct sunlight.

Demon WP Insecticide are usually not removed after application so that it can continue to kill insects for up to 90 days.  It is best to leave it there as long as there is activity.

Depending on the size and health of the fly and the amount of Demon WP it contacts, it generally would take anywhere from a few minutes to several hours for an insect like a fly to die after contacting an area treated with Demon WP. For a very quick kill for flying insects, we recommend Maxforce Fly Spot Bait or Alpine Pressurized Fly Bait.

Demon WP Insecticide is not labeled to be applied to areas where animals graze. To answer your question the residual of Demon Wp is 30 days. We recommend contacting your Local Cooperative Extension Office to find out what product would be safe and effective for you to use in your area. Once you have been given a recommendation, we can be sure to ship those products to you.

As long as the product label instructions are followed and the product is only applied to places indicated on the label, the product should not be harmful to humans or pets. 

As long as Demon WP had time to dry (1-2hours) the rain will not wash it away. It is best to apply to a dry lawn.