Water-hyacinth
Guides
Megamelus
Water Hyacinth Planthopper (for M. scutellaris)
Megamelus is a genus of delphacid planthoppers in the family Delphacidae, comprising at least 30 described species. The genus is widely distributed and primarily associated with freshwater aquatic environments. Several species, particularly M. scutellaris, have been extensively studied as biological control agents for invasive aquatic weeds such as water hyacinth (Pontederia crassipes). The genus exhibits wing dimorphism influenced by population density and host plant quality. Recent phylogenetic studies have clarified interspecific relationships and supported the monophyly of the genus.
Neochetina bruchi
chevroned water hyacinth weevil, chevroned waterhyacinth weevil
Neochetina bruchi is a South American marsh weevil introduced to over 30 countries as a biological control agent for invasive water hyacinth (Pontederia crassipes, formerly Eichhornia crassipes). First released in the United States in Florida in 1974, it now occurs throughout the Gulf Coast states and California. The species has been studied extensively for its effectiveness in managing water hyacinth infestations, with research showing its performance varies with environmental factors including salinity, temperature, and nutrient availability.
Neochetina eichhorniae
Mottled Waterhyacinth Weevil, Mottled Water Hyacinth Weevil
Neochetina eichhorniae is a host-specific weevil native to Argentina and neighboring South American regions. It was introduced to Florida in 1972 as a biological control agent for the invasive aquatic weed water hyacinth (Eichhornia crassipes) and has since been established in more than three dozen countries worldwide. Adults feed on leaves and petioles, producing characteristic feeding scars, while larvae tunnel into petioles and the plant crown. The species has demonstrated substantial suppression of water hyacinth growth, reducing biomass, flower production, and water surface coverage.
Niphograpta
water hyacinth moth
Niphograpta is a monotypic genus of crambid moths established by Warren in 1892. The sole species, Niphograpta albiguttalis, commonly called the water hyacinth moth, has been widely introduced outside its native range as a biological control agent for the invasive aquatic plant water hyacinth (Eichhornia crassipes). The genus is notable for its specialized ecological role and successful establishment in multiple continents.
Niphograpta albiguttalis
Water Hyacinth Moth
Niphograpta albiguttalis is the sole species in its genus, a crambid moth native to the Amazon basin. It has been intentionally introduced to multiple continents as a biological control agent for water hyacinth (Eichhornia crassipes). The moth's larvae tunnel into water hyacinth leaves and petioles, causing damage that can reduce plant vigor and spread. It is established in the southeastern United States, parts of Africa, and eastern Australia.