Ragweeds are flowering plants in the genus Ambrosia in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the Americas, especially North America, where the origin and center of diversity of the genus are in the southwestern United States and northwestern Mexico. Several species have been introduced to the Old World and some have naturalized and have become invasive species. Ragweed species are expected to continue spreading across Europe in the near future in response to ongoing climate change.
Ambrosia artemisiifolia, with the common names common ragweed, annual ragweed, and low ragweed, is a species of the genus Ambrosia native to regions of the Americas.
Plasmopara halstedii is a plant pathogen infecting sunflowers. The species is one of many pathogens commonly referred to as downy mildew. P. halstedii originated in North America.
Ambrosia psilostachya is a species of ragweed known by the common names Cuman ragweed and perennial ragweed, and western ragweed.
Chrysolina is a large genus of leaf beetles in the subfamily Chrysomelinae. Most species are distributed in Europe, Asia and Africa with a small number of species inhabiting North America and introduced species in Australia.
Chlosyne lacinia, the bordered patch or sunflower patch, is a North and South American butterfly in the family Nymphalidae.
Euaresta is a genus of flies in the family Tephritidae that live in plants of the closely related genera Ambrosia, Xanthium, and Dicoria, and feed on their flowers and seeds.
The Harpactorinae are a large subfamily of the Reduviidae. About 300 genera and 2,000 species worldwide have been described. Some of the species of the genera Zelus, Pselliopus, Sinea, and Apiomerus are of interest as biological pest control agents.
Epiblema strenuana, the stem-galling moth or ragweed borer, is a moth of the family Tortricidae. It is endemic to North America, but was introduced to Australia from Mexico to control the weeds of the family Asteraceae in 1982. It is occasionally misspelled as Epiblema strenuanum.
Parthenium hysterophorus is a species of flowering plant in the family Asteraceae. It is native to the American tropics. Common names include Santa-Maria, Santa Maria feverfew, whitetop weed, and famine weed. In India, it is locally known as carrot grass, congress grass or Gajar Ghas. It is a common invasive species in India, Australia, and parts of Africa.
Ophraella communa, common name ragweed leaf beetle, is a species of beetles belonging to the family Chrysomelidae.
Zygogramma bicolorata, variously referred to as the Parthenium beetle or Mexican beetle, is a species of leaf beetle in the subfamily Chrysomelinae, native to Mexico.
Calligrapha is a genus of large American Chrysomelinae of imprecise taxonomic boundaries. Most species occur in Central and South America.
Zygogramma disrupta is a species of beetle belonging to the family Chrysomelidae.
Zygogramma conjuncta is a species of beetle belonging to the family Zygogramma.
Zygogramma exclamationis, commonly known as the sunflower beetle, is a species of leaf beetle belonging to the family Zygogramma. It is regarded as a pest of sunflower crops in North America.
Zygogramma suturalis, commonly known as the ragweed leaf beetle, is a species of leaf beetle belonging to the genus Zygogramma. Native to North America, it has been introduced into Russia and China for the biological pest control of ragweed.
Paropsis charybdis, commonly known as the Eucalyptus tortoise beetle, is a species of leaf beetle belonging to the genus Paropsis. It is considered a pest of some species of Eucalyptus.
Myochrous is a genus of leaf beetles in the subfamily Eumolpinae. It is known from North, Central and South America. There are over 50 described species in Myochrous. The generic name is a combination of the Ancient Greek words μῦς (mouse) and χρῶμα (color).
Malacorhinus is a genus of skeletonizing leaf beetles in the family Chrysomelidae. There are about 30 described species in Malacorhinus. They are found in North America and the Neotropics.
