Biological Assay of Indigenous Pesticidal Plants in Ilocos Sur

Abstract

Plants, animals and microorganism are sources of natural products, which are results of primary metabolism. Such products are secondary metabolites. These substances are essential to living organisms and were found to have significant importance to man's life. These substances range from toxic to highly poisonous substances as well as edible ones for household use. In natural products, bioactive substances were found and isolated from plants. They were extracted from the leaves, flowers, fruits, roots and even the bark. It is the main purpose of this study to conduct preliminary tests to determine the toxicity of the leaf extracts of seven (7) indigenous plants species against Tilapia nilotica. Such plants were chosen based on the ethnobotanic information derived from the locality.