5% acetic acid vinegar, a squirt of lemon dish soap and a few tablespoons of sugar mixed together in a bowl kills the fruit flies within a day of arrival. It wi

5% acetic acid vinegar, a squirt of lemon dish soap and a few tablespoons of sugar mixed together in a bowl kills the fruit flies within a day of arrival. It will evaporate over time but adding water back to the original level reconstitutes the trap and it will work for months. This is just an interim solution until the lasers and machine vision are working.