Demon WP Insecticide - Questions & Answers

Demon WP Insecticide  is labeled for German roaches however will only kill roaches that come into contact with the treated area and does not have any transfer qualities which is important in eliminating an active roach infestation. This is not a contact kill and take 1-3 weeks to kill the roaches that have contacted the treated areas.

The best treatment for German Roaches as they reproduce quickly and in large numbers would be to use a combination of products along with diligent repeat treatments every 14 days.

Please view our Roach Control Kits and Roach Treatment Guide for more information. 

Demon WP Insecticide will kill listed insects that cross the treated areas. It is labeled for the control of cockroaches, or "water bugs".

You should also refer to our Cockroach Treatment Guide for recommendations on all of the necessary steps for effective roach elimination, and for links to related products.

Demon WP Insecticide is only mixed at 1-2 packets per gallon of water and each finished gallon covers 1000 sqft.  When using inside you are only applying to cracks and crevices, along baseboards, etc.  Any leftover mixed solution should be discarded after 24 hours.  If there are outside areas you can spray you can apply there.

Yes, Demon WP Insecticide can be applied with an IGR such as NyGuard IGR

Demon WP Insecticide is labeled for ticks as directed at 2 packets/gallon of water. Please take a few moments to review our tick guide here for a successful program. 

Cypermethrin is the active ingredient in several products that we carry. Demon WP, is usually the product that is chosen for german roach control. We have also put together the Roach Control Kit # 2 that contains everything you need to control roaches effectively, including Demon WP.

The best product we have for the larger cockroaches, or American cockroaches, is a product called Demon WP.  Demon WP is a wettable powder that you mix with water in a one gallon sprayer.  Wettable powders are easier for the roaches to pick up on their bodies, and they pack more of a punch which is what you need when treating for larger roaches. Since the larger roaches come from the outside, you want to concentrate your spray on the outside of the building.  Spray 2 to 3 feet up onto the building and 2 to 3 feet out onto the ground.  You can also treat inside the rooms where you have issues.  Demon WP is not only labeled to treat roaches, but almost any other insects you may have a problem with including spiders, ants, silverfish, etc.  You should apply once a month for best results.

Demon WP will control just about any spider that comes into contact with the treated areas. Demon WP works very well for even the hardiest insects including spiders, scorpions and roaches.

We can not give advice on sprays that would work for sensitive individuals or in schools. Each state and county have their own regulations that govern what they can and cannot use in schools. You can check with your local school board for their list of pesticides that can be used indoors. For more information on Demon WP and its use around sensitive individuals, you can contact the manufacturer Sygenta at 1-866-SYNGENTA.

Demon WP is labeled for use outdoors in areas where fleas develop. Demon WP should not be sprayed on any area where a horse may graze.

Yes, you can plug the hole without treatment if the hole is not big enough for the bee to enter. You should note that the bee may return and start to drill a new hole unless you apply an insecticide such as Demon WP. Some bees will actually bore through paint and varnish so using an insecticide is the only surefire way to get rid of them.

Typically it will not drive them inside because Demon is not necessarily a repellent, meaning the roaches try to avoid the area.  Roaches will walk over where you spray and get the product on their bodies.  Although they can make it inside before dying because Demon WP will take a little bit of time to kill the roach, they should be dead by the time they make it inside.  It definitely would not hurt to spray the attic space for good measure.

Suspend can be used but it does not have a very quick knockdown which is what you need for large roaches entering from outside.  The best product we have for the larger cockroaches, or American cockroaches, is a product called Demon WP.  Demon WP is a wettable powder that you mix with water in a one gallon sprayer.  Wettable powders are easier for the roaches to pick up on their bodies, and they pack more of a punch which is what you need when treating for larger roaches.  Since the larger roaches come from the outside, you want to concentrate your spray on the outside of the house.  Spray 2 to 3 feet up onto the foundation and 2 to 3 feet out onto the ground.  You can also treat inside the rooms where you have issues.  Demon WP is not only labeled to treat roaches, but almost any other insects you may have a problem with including spiders, ants, silverfish, etc.  You should apply once a month for best results.

You should spray Demon WP around your door frames, window frames, vents, eaves, around the bottom of your foundation, and any other crack or crevice where an insect could gain entry once a month August-November to stop lady bugs from entering your home.

Outdoor applications of Demon WP made once a month October - November can help you get control of the boxelder bugs, though you must understand that it will not drive them off of your property, it will only stop most of them from gaining entry into your home. You should also take the time to inspect the outside of your home and seal up any cracks, crevices or gaps you find so that you are limiting places where the insects can enter your home. Demon WP will also help eliminate roaches from your home but you will need to use it in conjunction with a high quality roach bait gel and an insect growth regulator as roaches like to hide and may not readily come into contact with treated surfaces. You can find both a roach bait gel and an IGR sold together in our Roach Control Kits. When the actual application of the Demon WP is being made all pets and children should be out of the house, and they can return as soon as the treated areas are dry. The roach bait gel should be placed directly into cracks and crevices around counters, sinks, drawers and cabinets. This will make the gel available to the roaches and inaccessible to your pets and children. The Gentrol Point Source do not actually contain any insecticides, just an insect juvenile growth hormone mimic. These discs can also be placed out of reach of children and animals and are readily used in sensitive locations such as hospitals and day cares everyday. Severe infestations may take several months to eliminate no matter what products you use. Sanitation will be a key factor in eliminating the roaches. Please take a few minutes to read the hints and tips in our German Cockroach article and our Boxelder Bug article to learn more about eliminating these pests.

You can spray all of your interior and exterior door frames, window frames and places where cables, pipes and wires enter through your walls with a good residual product such as Demon WP to help stop this pest from  entering your apartment. With apartment living you do have the issue of having pests from your neighbors apartment enter into your apartment through the walls. You can help reduce this risk by sealing up as many cracks and crevices as possible with caulk.

You cannot spray Demon WP or any other insecticide into your ducts. You can spray all around the exterior of your home and in your crawl space if you have one and around the vent covers. You should thoroughly check your duct work for holes and seal up any if found. In most cases insects are not actually in the ducts but instead they are crawling on exterior of them and then squeezing out beside the duct and coming out of the vent cover. You should remove the vent cover and caulk around the duct so that there are no opening allowing insects to pass beside the ducts and out of the vent covers.

Demon WP is not actually labeled for Japanese beetles though Japanese Beetles that land on treated surfaces will most likely be effected. We do recommend that you choose a product that is labeled for Japanese Beetles such as Talstar P for best results.

Demon Wp is one of the strongest products still left on the market.  That being said it will not kill immediately once dry after a spider walks over it.  Spiders are especially hard to kill because their main bodies are up off of the ground and they do not groom their legs like other insects.  There is no product that will kill very quickly, within minutes, after it is dry.  Only contact kill products, aerosols mainly that are sprayed directly on a spider, like Raid, will kill it that fast.  Demon is still considered the best residual product for spiders.

Each water soluble packet equals .33 oz of Demon which is the equivalent of 1 scoop of Demon from the 1 lb jar. If you use the 1 scoop per gallon usage rate you can make 48 gallons of solution.