Black Flag Dry Ant & Roach Aerosol Spray

Last updated date: July 13, 2020

DWYM Score

8.7

Black Flag Dry Ant & Roach Aerosol Spray

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We looked at the top Roach Sprays and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Roach Spray you should buy.

Editor's Note July 13, 2020:
Checkout The Best Roach Spray for a detailed review of all the top roach sprays.

Overall Take

Use this sprayer to kill large or small insects with equal efficiency. The extension tube is a big help in getting the substance into cracks or crevices, where it can deter roaches for months. The product is safe for indoor use with little residue.


In our analysis of 63 expert reviews, the Black Flag Black Flag Dry Ant & Roach Aerosol Spray placed 5th when we looked at the top 10 products in the category. For the full ranking, see below.

From The Manufacturer

Insects invading your corner of the world? Whatever insect you're fighting, Black Flag products are dedicated to providing the tools you need to regain control. With formulas that act fast and never back down, Black Flag insect controls have been arming homeowners in the battle against invading bugs for more years than any other brand. Black Flag Dry Ant & Roach Killer controls roaches, ants (excluding pharaoh ants and fire ants), carpenter ants, spiders, crickets, firebrats and silverfish with quick-killing action. Use this non-staining, dry formula indoors to flush listed insects out of cracks and crevices and kill them on contact. Keeps controlling German cockroaches for up to 6 months. Spiders (including black widow and wolf spiders) must be sprayed directly to be killed. Leaves no odor behind. Use the extension tube to direct spray into cracks and crevices in walls; dark corners of rooms, cabinets and closets; along and behind baseboards; beneath and behind sinks, stoves, refrigerators and cabinets; around plumbing and other utility installations; around waste containers and wherever else these pests may find entrance. Use along and behind baseboards, appliances, sinks, pipes and plumbing. To treat fleas and brown dog ticks, spray infested areas such as pet beds and resting quarters. Remove old pet bedding and clean or replace with clean, fresh bedding. Pets should not be treated with this product – to control the source of flea infestations, treat your pet with a product registered for application to animals.

Expert Reviews

Expert Summarized Score

9.2
4 expert reviews

User Summarized Score

8.3
130 user reviews

What experts liked

No nasty, oily leftovers or odor after use. Protects from ants, roaches, and other insects. Includes an extension tube to direct spray into cracks and small spaces.
- BestReviews
My kitchen was free of ants after one application. I’ve gone weeks now without ants since using the Black Flag home insect control spray.
- Family Handyman
The spray efficiently kills all types of cockroaches, ants, spiders and any other insects within 24 hours of contact with sprayed areas
- Insect Cop
It is guaranteed to keep working for up to six months against German cockroaches, so two times every year will be more than enough to keep your house roach-free.
- Seeds & More

What experts didn't like

Product takes a fair amount of time to dry. Spray can quickly fill room with chemicals if not applied directly into a crack.
- BestReviews
The spray does take approximately 10 – 15 minutes to dry off (depending on how heavily you’ve used it), so you need to be careful with the sprayed areas during this time.
- Insect Cop
This is called a “dry” spray because after it evaporates there is little to no residue left. However, when you apply it, the spray comes out wet just like any other one and it will take a solid fifteen minutes before it dries out.
- Seeds & More

An Overview On Roach Sprays

Do you feel like your home is your castle? If so, nothing can send you rushing to the battlements like the sight of a roach.

Even the most staunch animal lovers draw the line at cockroaches, for good reason. Aside from mosquitoes, they’re one of the hardest insects to love — and the hardest to kill. They tend to come out only at night. They’re great at hiding in even the smallest crevices. They multiply quickly, in rates that put rabbits to shame. Worst of all, they need the same food, shelter and water that our homes provide, and once they find it you can bet they’re setting up camp.

Roach sprays are one of the most popular ways to deal with these persistent pests. They’re hardly the only method, and they do work best when combined with other, more long-term solutions. But when roaches make an appearance, they’re one of the fastest ways to make them disappear.

Sprays can be formulated from a variety of different ingredients, some of which can carry health risks for more than their intended target. But the two main types of aerosol roach killers are intended for residual and non-residual use.

Of the two, residual sprays are a more strategic form of pest control. They lay down a deposit on surfaces commonly visited by roaches. Some residual sprays are meant to be a repellent to these bugs and serve as a barrier to their entry. Such sprays might include relatively benign ingredients such as peppermint oil or chrysanthemum extract.

Other residual sprays offer a more aggressive solution, using toxic substances that will stick to the roaches’ bodies as they walk through. These substances will either kill the roaches by poisoning them (and any roaches they come in contact with at the hive) or act as an IGR (insect growth regulator) by sterilizing them. Some sprays can even do a little of both. Lethal residuals commonly use cypermethrin or some other member of a synthetic class of chemicals called pyrethroids. Some common IGRs include hydroprene or methoprene. Either way, you’ll want to avoid using these residuals on surfaces where you eat or where children might play. Doorways or baseboards are usually a good bet.

Some of the best residual roach killers can only be used in certain areas, so pay attention to the ingredients and user guides. Products containing diatomaceous earth are especially popular and effective at sticking to roach legs, but the substance has to stay dry to work. Needless to say, that limits its use outdoors.

Non-residual sprays are a more immediate solution. Pyrethroids are another go-to ingredient in these sprays, but they are formulated more differently and are meant to kill on contact. Again, try to avoid using these on kitchen countertops or near pets or small children.

Knocking out a single roach or two with these products might be satisfying, but once again: It’s hardly a permanent solution. Once you see one roach, you can be sure there are more. A better strategy might be a multi-pronged approach. Non-residual sprays with a thin nozzle attachment are great for flushing cockroaches out of corners or cracks, right onto areas where you may have laid down a residual layer of insecticide. You can use this same process with bait traps or other non-spray forms of pest control.

The Roach Spray Buying Guide

The more weapons you have against roaches, the better. Just make sure to use them wisely. If you’re using bait traps, IGRs or some residual spray with a delayed effect, make sure you don’t use a contact killing spray anywhere too near that area. Roaches will avoid the traps you’ve set, rendering them ineffective.