German Cockroach

German Cockroach
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German Cockroach Identification

German roaches are light brown in color and may even appear tan when they are fully matured. They are marked with two dark brown and almost parallel stripes on their shield that run down their backs. Mature adult German cockroaches are about 13 mm to 16 mm long. Female german roaches are generally darker in color than the male German roaches are. Although adults possess wings, they rarely use them.

The nymphs of German cockroaches are the same shape as adult German roaches except they do not possess wings. The early instars or the younger nymph is significantly smaller in size; however, the late instars or the more mature nymph is similar in size to the fully developed German cockroach. Also, coloration or patterns that are on the back of the nymphs are almost opposite of the mature German cockroaches. Mature adults are mostly tan colored with dark brown patterns whereas nymphs are almost all dark brown to black with pale brown or white margins and a pale brown central area. The ends of their abdomens are uniformly dark in color and there are paler patterns towards the head of their bodies.

Egg capsules of German roaches are a yellowish brown color. They are usually two-toned and the paler side is usually the end that is attached to the female adult. Each egg capsule is about 6 mm to 9 mm long. On average, there are about 15 eggs to 20 eggs on each side of the egg capsule.

The Life Cycle of German Cockroaches

German cockroaches undergo a simple metamorphosis which means they molt as they develop into adult roaches. One average, one female German cockroach will produce about 5 egg capsules. Each egg capsule averages about 30 eggs to 40 eggs so in her lifetime, she can reproduce 150 to 200 offspring. Unlike many other cockroach species, German cockroach females carry the egg capsule with her until it is only about 1 to 2 days before the eggs are ready to hatch. The entire developmental time that it takes for a German roach to mature from the egg to an adult will vary with the circumstances that surround the breeding site. Developmental time can range anywhere between just 50 days all the way to a staggering 215 days. However, on average, it will take a little more than 100 days for one German cockroach to fully develop. This means that on average and under normal conditions, there can up to 3 to 4 generations in just one year and under the most favorable conditions, there can be as many as 6 generations in one year. Once the nymph develops into an adult, it can live for another 100 to 200 days. Although adult german roaches have fairly long life spans, population will consist of mostly nymphs.

German Cockroach Behavior

Although German cockroaches can be seen all throughout a structure, they are attracted to areas of warmth and humidity. They also thrive in areas close to their food and water source. That is why homeowners will typically find them in common areas like bathrooms, kitchens, and areas where people frequently take their food to eat like dens, living rooms, and dining rooms. German cockroaches forage on almost anything with any level of nutritional value. This is why they will feed on all foods and will also feed on things like soap and toothpaste.

Even though they have been seen migrating between houses when the weather is warmer, it is a rare occurrence. German roaches are typically carried into structures via shopping bags, boxes, or secondhand appliances like used microwaves, refrigerators, televisions, and etc. Likewise, although German cockroaches are capable of surviving outdoors, it is unlikely that they will nest or thrive in outdoor areas.

German cockroaches are known to transmit disease pathogens as they forage on human food. They also leave behind feces and other excrement as they travel which is why a German cockroach infestation is detrimental to a household. If an infestation is caught early, it is fairly easy to rid the house of German cockroaches, however, due to rapid reproduction rates, unless they are controlled, it will become difficult to control the invasion without proper insecticides.

How to Get Rid of German Cockroaches

Effective control of german roaches consists of several different methods. The main step is to maintain regular sanitation. German cockroach infestations thrive when there is an adequate food and water source available to them. Food processing areas and areas where food is carried to should be cleaned regularly and all leaking water pipes should be fixed immediately. This is the best preventative measure a homeowner can take. Although standard insecticide application procedures will apply to kill German cockroaches, because of their rapid reproductive rate, it may take more than just a few follow up applications to completely get rid of the infestation. During the initial clean out or inspection of German cockroaches, most of the population can be flushed out with a liquid, contact kill insecticide. Follow up liquid residual sprays can be applied on a regular basis to kill German cockroaches around the home as they come in contact with the spray.

Because German cockroaches are social insects and thrive in communities rather than live in solitude, it is crucial that you attack the breeding site, whether it is directly or indirectly. Using baits are the most effective way to attack a nest. Baits provide a secondary kill effect that will ultimately target the entire colony rather than kill just a single German cockroach on contact. Also, IGRs (insect growth regulators) will prohibit the growth of the population by prohibiting them from maturing. If they are unable to mature, they are unable to reproduce. Therefore, IGRs are an essential part of German cockroach control inside the house and aids in long term control.

Do You Have a Question about this Product? Ask Our Experts!


Q. how to kill roach?
I had a mixer board fixed and when I got it back it had baby roaches in it. I bought the Boric Acid Insecticidal Dust and used it on the board and in the board. How long does it take to kill the roaches?
A.  Boric Acid is an ingestion poison for crawling insects so it has a delay kill effect. We cannot give you a definitive answer on how long the delay is because it will depend on the insects and when they eat the poison.
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Q. German Cockroaches Control?
These guys are everywhere..even the mouldings in the ceiling..what do you suggest is the best way to rid my 1220 sq/ft house?
A.   For German Cockroaches, we suggest using a bait to lure the roaches. Because they are social insects, the roaches will take back the bait to their colony which will kill the entire colony. We recommend our Dupont Advion Roach Bait Gel.
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Q. german cockroach in house?
i have german cockroach problems
A.   For german cockroach, we suggest roach bait gels and also an IGR. Roach bait gels placed in areas of infestation will be effective in that there is a delay kill effect. The roaches will consume the bait and bring it back to their colony and ultimately share the bait with other roaches.

We recommend an IGR as well. IGR stands for Insect Growth Regulator. It restricts reproduction of crawling insect. It does not have a killing effect, however, it does slow down the reproduction rate of most crawling insect.

If you have any further questions or comments, please feel free to contact us again.
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Q. German roach control?
having some trouble w/German roaches in a rental house but not sure what kind. we have sprayed with talstar one time but have some bugs left. what kind of bait should we put out and how many times should we spray. The unit is currently empty?
A.  Actually, it may be the most effective to use a gel bait in an empty unit because there will not be an alternate food source for the German roaches.

Gel baits are effective in that it even though it has a delay-kill effect, the residual time is fairly long. Gel baits along with a an IGR would be the most effective.

An IGR is an insect growth regulator that will prevent the insects from reproducing. You replace the gel baits every 2 weeks.
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Q. German Roach Problem?
For the past month I have used the Combat Baits with the Active Ingrediant Fipronil .1% and the Amdro Gel with Hydramethylnon 2.15%. I've seen good results. Since these roach can become bait adverse, should I change the baits to something else or use an IGR? Or include something else in the control program?
A.  Yes, you are correct.German Roaches can become adverse to insecticides.

However, Dupont Roach Gel Baits are designed and produced so that the roaches can not become immune to the insecticide.

Dupont bait gels are known to be very effective. There is a slight delay-kill effect but has a long residual time.
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Q. Im not sure where the roaches are coming from I have tore my wolr hous apart and can not find nothing but when I go in to the kitchen I the middle of the nigt they are everywhere that is the only time I see them help me please where are they coming from??
A.  If they are the small German roaches, it will be extremely difficult to find their nest. They nest about 4-5 feet away from a water source and can be in the wall void of the house. The best way to target them is to use cockroach gel baits and other roach baits like bait stations. Apply baits in concentrated areas of infestation (kitchen, bathroom, laundry room) in target places like under the sinks and cabinets, behind the toilet, near water pipes, and etc. Visit this page to select a bait for cockroaches: http://www.pestmall.com/roach-bait/
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Q. German roach treatment product?
I received a package of Demon WP this week and used on two houses for roach control. I had previously hired this done, and when asked what product they were using, I couldn't get an answer, only that their product worked on everything. It was sprayed inside cabinets, any and all surfaces, for roach treatment. Could you give me your best guess (guesses) as to what product would be used by a pest control company? Thank you
A.  

Thank you for contacting us with your question. Demon WP is a good product that you can use for roach treatment, however we do not recommend that you use this to spray inside of your cabinets.

Inside cabinets we usually recommend the use of gels or a type of aerosol spray. Most liquid concentrated insecticides can be used for roach treatment on most surfaces, but it is always good to take caution before you spray because concentrated liquid insecticides have a residual time of up to 3 months.

When treating the kitchen or food area, you should always make sure all the plates are covered or removed from the area during treatment.

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Q. how to get rid of german roaches?
I just recently moved in with my stepfather only to discover he has a horrible problems with german roaches...i have a 6yr old and a 3 year old who happens to have an alliergy to roaches!!!how can i safely get rid of this problem...without costing me a a whole lot of $$$$
A.  

The most effective type of insecticide against German roaches is a bait type in the form of a gel or a bait station.

Gels can be applied in pea sized amounts that are about 1-1.5 ft apart in areas like under the sinks, behind the toilet, under the cabinets, in the laundry room and etc. The target locations are the bathroom, kitchen, and any other place that provides a good water source. Bait stations are plastic stations that are pre-baited and can be put in corners on the floor, stuck up high in corners, behind and under the refrigerator, behind and under the stove, and etc.

Here are the direct links to the product page:

Advion german Roach Bait Gel

Advion Roach posion bait Station

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Q. Hello, our house is infested with German cockroaches, mostly females because they are more darker, what is a good IGR to get rid of these roaches. Also, people say that when a female cockroach is fertilized it is able to produce offsprings its whole life. We are tired of this and we jst want to stop all this. No poison works and so dont the exterminaters. The cockroaches live inside the wall so that is where there nest is. How do we kill them off for good.?
A.  Baits are the best type of insecticide to use again German cockroaches. You will be able to target the nests without actually finding them with the baits. You can use such baits like Dupont Advion Roach Gel Bait or Maxforce FC Magnum Roach Get Bait. Gentrol is the IGR that we recommend for roach control. Use Gentrol Point Source or Gentrol liquid concentrate to mix with water and spray into isolated areas. If you have any questions about roach control or roach killing products, feel free to contact us again via email or telephone at 1-800-788-4142.
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Q. Can I get rid of the german roaches by having my house hold very clean and leaving no food were they can reach??
A.  Roaches in general are attracted to food sources and moisture sources. You may need to treat with chemicals depending on the infestation, but getting rid of food/water sources will help keep them at bay.
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Q. German Roach?
I'm not sure but I think I found one...on the second floor on the wall between bedooms and a bathroom. Bought a short-sale that had been a rental property. What is the best broadform roach / bug killer program you can recommend?
A.  Many of the liquid concentrate forms of insecticide will be a broad spectrum insecticide that also kills roaches. Suspend SC and Talstar Pro are among many that are used by professionals.
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Q. is gentrol,niban,and delta dust a good treatment for getting rid of german cockroaches??
A.  Instead, we recommend using gentrol, advion roach bait, and delta dust for getting rid of german cockroaches. Gentrol and advion can be used in the same place, but delta dust should be used separately (with gentrol)in areas such as wall voids, under appliances, under sinks, etc.
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Q. how to kill cockroaches?
I found many German roaches in my kitchen and I have used the Raid spray and baits which kills most of them. But I can still see one or two roaches when I come into the kitchen. People say that Advion Roach Bait Stations are quite effective. Could you please give me some suggestions? Thanks.
A.  Yes, both the Dupont Advion Roach Bait Stations as well as the Dupont Advion Roach Bait Gel are very effective for German Roaches.
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Q. Am I responsible for German roaches in my apt? ?
I live in an apt building and I'm a neat freak. I clean my apt every single day til its spotless. However I still see German roach about 3 to 4 times a day. That may not be as bad as most cases, but I'm very clean and I don't want to see them at all. Am I responsible or my landlord to kill them them? Or what can I do on my part to get rid of the problem? When I do see them, its in my bedroom or hallway but rarely in the kitchen near food. Why is that?
A.  Apartment complexes are difficult to give a general treatment for German roaches. All tenants need to be proactive in taking care of the situation and usually, it will be the landlord's responsibility to make that happen. We do recommend using gel baits like the Dupont Advion Roach Gel Bait to help control the German roaches inside your apartment. Apply the gel bait in pea-sized amounts under the sink, behind the toilet, under and behind appliances, under cabinets, and etc. Each spot should be about 1-1.5 feet away from each other.
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Q. I have the German cockroach And have read on ways to kill them bout my question What is safe with my dog and bird? Birds have a very sensitive respiratory system and afraid to use some of the pest control out there. Do you know any safe solution??
A.  For German cockroach infestations, baits are the most effective. Use gel baits like Dupont Advion Roach Bait Gel or bait stations like the Maxforce FC Roach Bait Stations. Place gels in areas that are inaccessible by your pets like under the sink, under the cabinets, behind the toilets, behind and under the appliances, and etc. Use the stations where it is possible for them to access like corners of the rooms, on top of counters, and etc. If you have any further questions or comments, please feel free to contact us again.
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Q. Restaurant roach control?
I just bought Orthene pco pellets and Gentrol for Restaurant roach problem. Can i mix the two together and apply it at once or do i have to apply it individually?
A.  Yes, the two roach control products can be mixed in the same gallon of water and applied by one application and not separately.
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Q. what works well to kill roaches in a multi-animal facility? ?
A.  We wonder what kind of facility you are inquiring about. Usually, for a German cockroach infestation, we will recommend baits, whether it is a bait station or bait gel. We especially recommend the pre baited cockroach bait stations like the Maxforce roach bait station so that you can protect the animals from getting into the bait. You can use the gel baits in areas that they cannot access. These will be behind large pieces of furniture, in cracks and crevices on utility pipes like behind the toilet and under sinks. If you have any further questions or comments, please feel free to contact us again.
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Q. what do you have available in an aerosol can for german roaches??
A.  For German Roach treatment we have a listing of aerosol cans you may choose from. http://www.pestmall.com/roach-spray/
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