Submitted to: International Journal of Pest Management
Publication Type: Peer reviewed journal
Publication Acceptance Date: 5/22/2005
Publication Date: 7/1/2005
Citation: Joshi, R.C., Meepagala, K.M., Sturtz, G., Cagauan, A.G., Mendoza, C.O., Dayan, F.E., Duke, S.O. 2005. Molluscicidal activity of vulgarone b from artemisia douglasiana (besser) against the invasive, alien, mollusc pest, pomacea canaliculata (lamarck). International Journal of Pest Management. 51(3):175-180. Interpretive Summary: Vulgarone B, a natural compound from mugwort, was found to be an effective molluscicide against golden apple snail, a major agricultural pest in rice in Asia.
Technical Abstract: Golden apple snail (GAS), Pomacea canaliculata (Lamarck), is a native of South America. It was introduced to Asia as a protein source and a source of income for farmers in the rural underdeveloped areas. However, the demand dropped because GAS was found to transfer the rat lungworm parasite (Angiostrongylus cantonensis) to humans if undercooked GAS is consumed. Farmers growing GAS abandoned their cultures, and the snails were disposed of without precautions. GAS soon invaded the rice fields, where it found an ideal habitat and abundant food supply. Previous studies show that vulgarone B has a molluscicide activity against ram's horn snail (Planorbella trivolvis), which is a pest in commercial catfish production ponds, particularly in the Southeastern part of the USA. In this study, vulgarone B was tested against GAS. Laboratory bioassays indicated that vulgarone B had comparable activity to that of the commercial synthetic molluscicide (metaldehyde), both with an LC50 at 24 hours of about 30 µM. Sprayed vulgarone B is not toxic to rice seedlings at concentrations that caused 100% mortality of GAS. However, it caused chlorosis when incorporated into agar on which rice seedlings were grown. Ovicidal activity was tested on egg masses at various ages (1, 3, 5, 7, and 10 days) at concentrations ranging from 1-400 µM, but no ovicidal activity was found.