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Liquid smoke from rice hull has the potential to be developed as a natural pesticide, because of its contents of chemical compounds which is good for controlling insects. The purpose of this research was to find out the best formula from liquid rice hull smoke to control brown planthopper. The methodology used through several stages of activities, namely (1) purification of liquid smoke, (2) formulation of natural pesticide with liquid smoke as active compound, synergistic, adjuvant, and solvent; (3) toxicity of formula and (4) bioassay tested of formula to brown planthopper in the laboratory. The formulation was arranged completely randomized design with three replications. The results showed that 7 formulas of natural pesticide based on liquid rice hull smoke were highly effective to control brown planthopper assessed by mortality test. Furthermore, the toxicity test on those formulas has toxicity (LD 50 ) ranging from 128 to 725 ppm. All formulas are still categorized as toxic and can use as a pesticide. Mortality test results with 3 variations of concentration, i.e., 40%, 30% and 10 % showed that the best results were in a concentration of 10%. In this case, for 7 days observations, pesticides with a formula of F1, F2 and F3 killed more than 90% of brown planthopper.

Natural biopesticide from liquid rice hull smoke to control brown planthopper