Certified GKH Gardening Expert
This can be dealt with a number of ways. You can use premade insecticides, or craft your own. Many of these you will already have the ingredients for.
This article will help you to craft your own insecticides: https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm
This collection of articles will give you many recipes, and other helpful hints for healthy gardens: https://www.gardeningknowhow.com/special/organic