Use 1 bulb of garlic (separate cloves and smash) and 1 onion (sliced). Put into a qt. jar. Add a teaspoon or two of cayenne pepper. Fill jar with almost boiling water. Cover and let sit overnight.
Strain using coffee filter. Add a drop or two of dish-washing liquid and a drop or two of cooking oil or neem oil. Shake to combine. Put into spray bottle, and spray on plants (don't forget under the leaves).
Repeat if it rains. Works for all kinds of insects.
I tested this on a water bug that was running around. In 30 seconds, that bug turned over on it's belly and was dead as a door nail.
Some of the pests are just don't like the spray and avoid the plants.
Thanks for the recipe! Everything (seeds) I planted in the garden a week ago, with the exception of green onions & chives, has come up! We had a couple of 90 degree days and I watered every day when we didn’t get rain showers. The pests will be arriving shortly. The ingredients might help keep deer away as well, although I haven’t seen the herd (7 of ‘em) in a couple of weeks - the does should be dropping fawns pretty soon.