As an owner of a small multi-family rental property, I can tell you this stuff is a Godsend for the long-term control German Cockroaches and other insects. I was going to buy this or Drione having been given some of this before by an exterminator friend who filled my duster bulb, I decided to buy more based on a good experience.
With German roaches the general rule of thumb I read is thst you need a treat using integrated pest management: clean, exclusion, and an active ingredient.., Specifically, you need two modes of action, and you want something that kills the bulk fast and something that provides long-term control. A pyrethroid spray works fast killing many of the roaches that directly contact it, but it lasts at most 90 days indoors, and it will never get them all. The fear is the roaches can and do rebound and the survivors may acquire a pyrethroid resistance hence the multiple modes of action. If two of them do not die from being sprayed the dust will likely, eventually kill them and make it uninhabitable to their young, AND This dust lasts a very long time unless disturbed or wet. I do not use waterproof dust indoors... I like to be able to have it cleaned up easily with a wet rag from a hard surface.
ALWAYS READ THE LABEL and use common sense with any product.. I would NEVER place a dust on carpet or furniture or anywhere it can be disturbed because nobody wants to breath it, but behind the fridge and stove, up under sink basins, and various cracks and crevices is where powders are incredible because they fill voids. This stuff is great because its mode of action is mechanical damaging the exoskeleton... I would imagine when they groom they eat it too, but it is hard to develop a resistance to something mechanical. For example, you squash(mechanical) a roach and it dies regardless of which pesticides it can tolerate. That is why i choose this over a pyrethroid dust... when pyrethroid sprays are already being used as a first-line.
OWNERS, when someone moves out inspect with a flashlight everywhere even when you do not see anything... behind stoves, refrigerators, washers and dryers, up under sink basins etc. If you look hard enough you may be surprised what you find; I was! Additionally, when it comes to properties, pest-control of any multi-family unit is ultimately the responsibility of the landlord to keep pest-free even while tenants live there because if you have tenants at least one of them will bring pests eventually. It may be a six unit building, but it takes only one tenant. Being insect-free AND good on maintenance is the way to keep your tenants renewing leases.
The key is to do a spring and a fall inspection by an actual exterminator who takes notes for cleanliness and any pests seen. If he or she does not see anything of interest, they spray a little pyrethroid spray on the baseboards in the kitchen and bathrooms such that if a random, stray insect comes into that area it hopefully comes in contact and dies before it’s reproductive lifecycle starts. Insist your inspector place at least one glue board per each bathroom or kitchen, too for monitoring purposes.
If they see something more, you pay them to resolve it and if the tenant has a part like cleaning dishes, he or she is politely put on notice to work wirh the process, so we can help them (and protect the property)... according to the lease they must comply. I would not do an application myself wirin an occupied residence except my own, personally. Regardless, the key to everything is to catch an infestation early, so it does not end up a horror scene out of a SciFi film because some tenants will NEVER see or say anything. Just search the Internet for Roach videos... they are 100 times worse that what I am dealing with now, and all this is because I skipped the spring inspection due to COVID-19 not sending anybody into anyone else’s unit.
What I do for a turn between tenants in a situation like this is get it to no visible activity, then I put down glue boards and monitor for 14 days minimum before renting the unit.
Last,y, property owners... between turns caulk everywhere, put in mesh, expanding foam etc. Exclusion helps keep any problem to the problem tenant. In a tenant’s toilet tank out a sanitizer tablet, so the water in the bowl is indrinkable. Put a bleach tablet in the condensate pan of a refrigerator again, so the water is undrinkable to insects.
Conclusion. This is a wonderful product we have used for years, and it helps me be a preferred landlord by ensuring I am renting places only if I would want to live there, which is the first question you should always ask yourself when renting a location, “would I want to live here?” If no, why not? And resolve whatever issue. In the long-run it is more profitable to have insect-free, wel, maintained units wirh good, happy “paying” tenants.
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