Effectivity of adelfa (Nerium indicum) as molluscicide to golden snails (Pomacea canaliculata Lam.)
1997
Diego, M.T.
The effectiveness of adelfa (Nerium indicum) in the control of the golden apple snail (Pomacea canaliculata Lam.) was determined and tested using different levels of concentration which were: 2.5 percent (25 g leaves:1 li water), 5.0 percent (50 g leaves: 1 li water), 7.5 percent (75 g leaves:1 li water). This study was conducted at the San Agustin National High School, San Agustin, Isabela [Philippines] from Feb to Mar 1996, using the Completely Randomized Design in Factorial. Based on the obtained results in the study, the molluscicidal properties of N. indicum leaf extract against P. canaliculata increased with a corresponding increase in its concentration and length of exposure. All the growth stages of the golden apple snails could be effectively controlled by the different concentrations of the leaf extract and the rate of mortality was influenced by the concentration of N. indicum extract, growth stages of the snails and length of exposure. The cost of preparation of the N. indicum leaf extract and its application is cheaper than the commercial synthetic pesticides but the source of the plant is limited hence, the application will be in a limited scale, seedbeds by rice farmers. The cost of covering 450 sq.m. (seedbed for 1 ha) for the adelfa leaf extract at 7.5 percent concentration is only thirty nine pesos and eighty-three centavos which is cheaper than commercial molluscicide by twelve pesos and sixty-seven centavos. D4 (7.5 percent concentration is recommended due to higher percentage mortality of golden apple snails)
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