Infested soil severely
Soil infestation with various sucking insects killing plants I have for 18 yrs one by one. All products recommended to no avail. Been picking pest embedded on plants until early hours, but can’t keep up. The more I pull with twister they multiple. Not a single plant spare with group of pests 😩
Your first step is to get an ID on the insect. Get a good picture of one and post it one of the insect ID websites. Once you know what it is, you can research proper treatment. Without an accurate diagnosis, you won't find the correct treatment.