This study tackles the efficacy of bitter gourd seeds (Momordica charantia), rosemary leaves (Rosmarinus officinalis L.) extract as organic cockroach insecticide, including Saba (Musa balbisiana colla) and señorita (Musa acuminata señorita) banana peel ashes acting as the insecticide’s pH level stabilizer. The bitter gourd seeds were macerated in an n-hexane solvent and kept in dark-glass flasks where it was stirred twice a week. The extracts were filtered and concentrated using a rotary evaporator. Rosemary leaves were grounded using a mortar and pestle then transferred in a large Erlinmeyer flask. It was soaked in n-hexane solvent for several hours, followed by filtration. It then was also filtered and concentrated using a rotary evaporator. The banana peels were cut and sun-dried for 3 days, then burnt in a furnace, resulting in ash. The ash was mixed with 150 ml of water then strained using a sift strainer. After straining, it was boiled for 30 minutes wherein vegetable oil and borax were added into it. It was cooled down and separated into 3 mixtures. The oil extracts were added in each mixture with varying ratios via measuring cup. Each mixture underwent 3 different trials. Results indicated that all concentrations achieved 100% mortality rate, however C2 was the fastest in eradicating the American cockroaches where it achieved an average time of 5 minutes and 20 seconds. The results from conducting this study reveal areas for improvement, therefore the researchers suggest gathering more test subjects to further test the spray's efficacy.