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Pest Education: Spiders in Ontario

Updated: Dec 5, 2023

Monday, December 26, 2022 by Greeny’s Pest Control Inc.

this is a picture of a dock spider crawling on wood in Onario
Dock Spider in Ontario

Spiders are a common sight in Ontario, and many people have a love-hate relationship with these eight-legged creatures. On one hand, spiders are important members of the ecosystem and play a vital role in controlling pest populations. On the other hand, some people are afraid of spiders or find them creepy and prefer to keep them at a distance. Regardless of how you feel about spiders, it's important to know a little bit about the different species that you may encounter in Ontario.


There are over 3,000 different species of spiders in Canada, and many of them can be found in Ontario. Some of the most common species you may encounter include the American House Spider, the Yellow Sac Spider, and the Wolf Spider.


The American House Spider is a common sight in homes, gardens, and other areas where people live. It gets its name from the fact that it is often found in houses and other man-made structures. These spiders are brown or grey in colour and have a small, round body. They are not aggressive and generally only bite humans if they feel threatened.


The Yellow Sac Spider is another common species that can be found in Ontario. These spiders are yellow or green in colour and have a small, elongated body. They are often found in gardens, fields, and other outdoor areas. Yellow Sac Spiders are venomous, but their venom is not usually harmful to humans. However, their bites can be painful and may cause swelling or redness.


Wolf Spiders are another common spider species that can be found in Ontario. These spiders are large, with a body that can be up to 3 cm in length. They are usually brown or grey in colour and have a hairy appearance. Wolf Spiders are not venomous, but they can give a painful bite if they feel threatened. They are often found in gardens, fields, and other outdoor areas.


There are many other species of spiders that can be found in Ontario, including the Black Widow, the Brown Recluse, and the Hobo Spider. These species are venomous and can cause serious health problems if their venom is injected into the body. However, the chances of encountering one of these spiders in Ontario are relatively low, and they are not commonly found in homes or other areas where people live.


If you do come across a spider in your home or garden, it's important to remember that most spiders are not dangerous, and they can even be an additional source of food for birds and other small animals.


If you are afraid of spiders or simply don't want them in your home, there are a few things you can do to prevent them from entering. Keep windows and doors closed as much as possible, and make sure that any holes or cracks in your home are sealed to prevent spiders from entering. You can also use a spider repellent or keep a clean home, as spiders are attracted to clutter and mess. Ultimately, the most effective approach is to have a licensed pest control company perform a treatment to the home. This generally includes a liquid treatment around the foundation, windows and doors, as well as the roof line and soffits.


In conclusion, spiders are a common sight in Ontario, and there are many different species that you may encounter. While some species are venomous and can cause health problems, most spiders are not dangerous. If you are afraid of spiders or simply don't want them in your home, there are steps you can take to prevent them from entering.

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