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Why are ants considered pests?

Ants are often regarded as nuisance pests in and around buildings. Small mounds resulting from their excavations may be considered unsightly along garden paths, on balconies and around skirting boards. Occasionally, such excavations under paths may be sufficiently extensive to cause cracks in the path. Trailing of the ants them selves, in and around buildings is considered unsightly by many. Where plants are grown ants may attached and damage or consume seeds and seedlings. Swarming may occur within premises and this may prove particularly disturbing to occupants.

As well as general nuisance aspects ants may present a health risk. Instances of ants mechanically carrying on their bodies or in their digestive tracks disease organisms causing dysentery, smallpox and a variety of pathogenic bacteria including salmonella are known. Ants commonly scavenge in kitchens and other food handling area, as well as in garbage cans, dog excrement and other possible sources of disease organisms their potential for transmitting diseases to humans should not be overlooked.

In addition to the health threat posed and nuisance aspects, some ants may bite or sting humans.


Why are spiders considered pests?

Apart from having an unsightly appearance some spiders can potentially have strong enough venom and means of manifesting it, resulting in painful bites, rashes, gangrene and in some instances death.


Information Source:
Gerozisis, John, and Phillip Hadlington. Urban Pest Management in Australia. Sydney: UNSW Press, 2001. N. pag. Print.