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A weed is an unwanted plant.
The notion of "wanted" is of
course entirely in the eye
of the beholder. A weed in
one situation might be a
wildflower in another. In
order to reduce weed growth,
many weed control strategies
... > full story
Introduced species
An introduced species (also
known as an exotic species)
is an organism that is not
native to the place or area
where it is considered
introduced and instead has
been accidentally or
deliberately transported to
... > full story
Pest (animal)
A pest is an animal which
has characteristics which
people regard as injurious
or unwanted. An example of
serious pests are those
organisms which vector human
disease, such as rats and
fleas which carry the plague
... > full story
Zebra mussel
The Zebra mussel (Dreissena
polymorpha) is a bivalve
mussel native to freshwater
lakes of southeast Russia.
Zebra mussels are currently
causing serious problems in
North America and Sweden,
where they are considered an
... > full story
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Purple loosestrife
Purple loosestrife is a semi-aquatic herbaceous plant belonging to the loosestrife family, Lythraceae, native to the wetlands of Eurasia. It is a herbaceous perennial plant, growing 1-2 m tall, ... > more -
Water hyacinth
The seven species of water hyacinths comprise the genus Eichhornia of free-floating perennial aquatic plants native to tropical South America. One of the fastest growing plants known, water hyacinth ... > more -
Invasive species
Invasive species is a phrase with several definitions. The first definition expresses the phrase in terms of non-indigenous species (e.g. plants or animals) that adversely effect the habitats they ... > more -
Toxicodendron
Toxicodendron is a small genus of woody trees, shrubs and vines, all of which produce the skin-irritating oil urushiol, which can cause a severe allergic reaction; hence the scientific name which ... > more -
Gypsy moth
The gypsy moth, Lymantria dispar, is a moth of European origin. Gypsy moth larvae prefer hardwoods, but may feed on several hundred different species of trees and shrubs. In the East the gypsy moth ... > more
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