Salvinia molesta Mitchell is a weed to watch [Philippines].
1986
Lopez F.S.S. | Tan B.C.
Salvinia molesta Mitchell (Fam. Salvinia caena), the second most obnoxious aquatic weed after Eichhornia crassipes, has been introduced into the Philippines. Following the report of its presence, we reviewed its world wide distribution and surveyed its local range. It is considered a noxious weed in many parts of Australia, Africa and Southeast Asia occurring mostly in the warmer areas. In the Philippines, it is found in ricefields, irrigation canals, waterways, lagoons and backyard ponds in about 20 localities on the Islands of Panay, Negros and Guimaras [Philippines]. Salvinia occurs in the wild as a weed and is also grown and harvested for forage feed, compost or mulch. Its initial introduction and subsequent spread are the combined results of people's negligence in handling and ignorance in mistaking the plant for Azolla hence the name "super Azolla" and "Australian Azolla". There is yet no published evidence that it has attained an obnoxious status to menace the local aquatic ecosystems and its actual threat and damage done to these ecosystems have not been assessed. The Ministry of Agriculture, Plant Quarantine Office, however, have declared Salvinia molesta Mitchell a noxious weed.
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