Spiders

About Spiders

Spiders belong to the class Arachnida which also includes scorpions, ticks, mites and pseudoscorpions. Like insects and crustaceans, spiders have an exoskeleton, so growth is by periodic moulting of the old skin. They can be readily distinguished from insects because they always have four pairs of legs, unlike adult insects that have only 3 pairs, and the body of a spider can be divided into 2 main parts, the cephalothorax and abdomen, in contrast, the body of adult insect is divided into 3 main parts; head , thorax, and abdomen. All spiders hatch out as minute replicas of the adult of the species, there is no metamorphosis as occurs in many insects.

All Australian spiders can be placed in one of two groups , Mygalomorphs( primitive or old world) or Aranaemorphs ( modern or new world ). These can be distinguished using two obvious features. Mygalomorphs have parallel downward pointing chelicerae or fangs which the spiders have to raise their front part of their body to strike. Compared to to aranaemorphs whose chelicerae or fangs work laterally like pincers. Secondly mygalomorphs have two pairs of lung books visible as pale patches under the abdomen compared to aranaemorphs who only have one pair of lung books. Mygalomorphs include spiders such as funnelwebs, trapdoors, mouse spiders and the brush-footed trapdoors (birdeaters) and the aranaemorphs include spiders such as open range hunters (wolf spiders), apprentice weavers (redback spiders), and master weavers( garden orb spiders).

From a pest control perspective, spiders can form a major percentage of our domestic work. The reasons for the control of spiders are based on two main reasons. General untidiness due to cobwebs and because of human instinct and media portrayal, the majority of the general population have a phobia of spiders, the sight or even the thought of totally harmless species can send some people into panic. Spiders behaviour of webbing particularly around areas of high insect activity( ie lights and windows) can give many dwellings an unsightly appearance for these reasons many people seek the services of a professional pest controller, some every 6 months.

Personally I love spiders; however we as humans create an environment ideally suited to what I call “household spiders”. We build structures perfect for them to build webs on and we leave lights on to attract their food. These “household spiders” don’t build up to the numbers in the natural environment that we see around our house. Therefore spider control is about returning spider numbers back to normal levels.

What you can do.

Many household insecticides are very effective on spiders, in fact most of them contain the same active ingredients as what professional pest managers use just in diluted strengths and smaller quantities. Insecticides belonging to the group synthetic pyrethriods (SPs) are very effective against spiders and have a high safety margin. SPs include the actives bifenthrin, deltamethrin, tetramethrin basically any active ingredient that ends in ‘thrin’. The key is getting complete coverage inside and out safely. Household packs used around doorways , windows and verandahs can definitely give results. However if it’s a virtually spider free environment you want to achieve then annual treatments by Laguna Pest Control are the way to go.

What we can do.

Anybody can kill a spider, a size 9 seems to be very effective, but to keep on controlling spiders long after spraying is what takes skill and knowledge of different spiders behavior. Different spiders prefer different areas of your house. For example the Red House Spider Nesticodes sp. prefers your cornices, wolf spiders Lycosa sp. are a ground dwelling spider attracted to your porch lights, the Black House or Window spider Badumna sp. as its name suggests prefers window corners, downpipes and your eaves line. And the list goes on, that’s why we use different residual insecticide formulations to target the different areas for different spiders. Our general pest treatment will cover all those accessible areas household spiders like to frequent, this includes internal skirtings, subfloor, garage, clothes line, balconies, external walls, carports, verandahs, ceiling void, fence lines, garden shed, play equipment and even your letterbox!

What to expect after the treatment.

To have less spiders of course! Some “pesties” will tell you that you will be totally and utterly spider free and others will come up with every excuse as to why you are still seeing spiders. The truth is even a thorough treatment will only reduce up to 80 – 90% of your spider population. That’s because a spider first has to come into contact with the chemical for it to work .And even when it does, the spider doesn’t simply drop dead, it will wander around groggy for a while even up to 12 hrs. As I always say “healthy spiders try to stay hidden and concealed whereas sick and dying spiders wander around out in the open for you to see!”

How long it lasts depends on many factors. The chemical breaks down at different rates, for instance the chemical bonds to some surfaces better than others, constant exposure to sunlight will break down the chemical, wear and tear from cleaning and foot traffic. In other words the chemical would last the longest on bare soil on the south side of the house. Then add to the fact different spiders are affected differently ,active ground dwelling spiders are more likely to come into contact with the chemical whereas webbing spiders which don’t move around much are less likely to come into contact with the chemical after the treatment. Then it depends on the location of the house, a house in suburbia is going to have less spider pressure than a house nestled up in the Hinterland. And to complicate the answer even further it depends on your level of tolerance, some people can’t bear seeing a spider whereas others just want to keep on top of the numbers.

On average though most houses require only annual treatments and by the 3rd consecutive annual treatment most houses are virtually spider free and it then becomes basically a maintenance treatment. And as with all our general pest treatments we give a 6 month free service period so at any stage during this time you are not happy with the results we will retreat NO CHARGE!

Black House Spider  Brown Huntsman Spider  Daddy Longlegs  Grey Huntsman Spider  images (3)  Red House Spider

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