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Monochoria vaginalis (pickerel weed)
M. vaginalis is a serious weed in ricefields in east and southern Asia. It is a principal weed of rice in Korea, Malaysia (Sarawak) and the...
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Alternanthera philoxeroides (alligator weed)
A. philoxeroides is one of the greatest threats to rivers, wetlands and irrigation systems in the world. This weed is extremely difficult to...
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Striga asiatica (witch weed)
S. asiatica, in common with most other parasitic weeds, is not especially invasive in natural vegetation, but is much feared in crop...
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Urena lobata (caesar weed)
U. lobata is a pantropical weed which is also a cultivated crop in many regions. As an aggressive invasive plant it is included in...
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Parthenium hysterophorus (parthenium weed)
P. hysterophorus is an annual herb that aggressively colonises disturbed sites. Native to Mexico, Central and South...
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Salvinia molesta (kariba weed)
Plants: annual or perennial, heterosporous herbs, free floating, with microspores and megaspores produced on the same plant, green, up to 30 cm...
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Chromolaena odorata (Siam weed)
C. odorata is a very widely distributed tropical shrub that is still expanding its range, and is considered one of the world’s worst...
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Sargassum muticum (wire weed)
S. muticum has successfully invaded temperate coastlines on the Pacific coast of North America and western coasts of Europe. Initial...
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Ageratum conyzoides (billy goat weed)
Although A. conyzoides and A. houstonianum are early colonizers, both are rapidly replaced by woody species when land is left undisturbed. Both...
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Gracilaria tikvahiae (graceful red weed)
G. tikvahiae is commonly found in estuaries and coastal waters characterized by high nutrient availability. This species is capable of...
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