Insecticidal Effect of Yellow Oleander (Thevetia peruviana) Fruit Extract on Rice Bugs (Leptocorisa oratorius). According to the Department of Agriculture Reference Manual (1998), 14% loss of rice is due to rice bugs infestation. A survey conducted in Cuartero, an agricultural town in Capiz revealed that rice bugs rank third among the pests infesting rice. Generally, the study aims to find out if Yellow Oleander fruit extract can be used as insecticide against rice bugs. Specifically, it aims to determine if there is significant difference in the effect of different concentrations of Yellow Oleander fruit extract, and varying the mortality rate (in minutes) on the percent mortality mean of rice bugs.
The experimental design was Completely Randomized Block Design (CRBD) with the following treatments: Treatment A – (25 ml extract + 25 ml water), Treatment B – (50 ml extract + 25 ml water), Treatment C – (75 ml extract + 25 ml water), Treatment D – (100 ml extract), Controlled set-up (100% water) and replicated three times. The crude extract was obtained by pounding, squeezing, and filtering. Phytochemical analysis revealed that extract of the young fruit contains alkaloid at 0.73%. Thevetin at 0.37%, Peruvoside at 0.35%, Cyanogenic Glycosides at 0.12%, and Iridoid Glycosides at 0.07% have influenced the effectiveness of extract and using greater concentrations can hasten and increase mortality to 100%. Using the One-way Analysis of Variance and Duncan’s Test, results led to the conclusion that: Yellow Oleander can be used as an insecticide against rice bugs. There is significant difference in using different concentrations of Yellow Oleander fruit extract and varying the length of time (in minutes) of exposure on the percent mortality mean.
Materials & Equipment
Further clarification of the procedures and results should be directed to the researchers and adviser.
Lawrence Oliver D. Sales
Niel Christopher Delfin
Mrs. Maria Fatima Bolido
Capiz National High School