City of Dallas Forestry


​Invasive Species


The Good, the Bad and the Ugly

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The definition of an invasive species is:      

1) a non-native to the ecosystem under consideration and 2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health. Invasive species can be plants, animals, and other organisms (e.g., microbes).

Below are just a few common in our area, and some control methods.  If chemical treatment is needed, please check with your local landscape or tree service for a licensed applicator. 


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Feral Hogs

Feral hogs are and old world species and the most reproductively efficient animal on Earth, and they can adapt to survive in nearly any environment.  Statisticians have estimated that due to the feral hog's high reproductive rate, 70% to 75%of the population must be harvested to contral the population.  In 2007, researchers estimated that each pig carried an associated (damage plus control) cost of $300 per year, and an estimated 5 million wild pigs in teh population at the time, Americans spending over $1.5 billion annually in damages and control costs. Assuming theat the cost-per-wild pig extimate has remained constant, the annual costs in the United States are likely closer to $2.1 billion today.