White Bugs or Insects
I have lot of plants in my garden. I have a problem with white little bugs or insects eating and leaving on certain plants they eat the leaf and leave white residue. They attach themselves on the back of the leaf. I don't know what kind it is but it's frustrating before half of the plants are infected. I try different sprays but no result.
Certified GKH Gardening Expert
It is possible that it is scale or mealybugs. I like to treat both with neem oil. It is very effective and safe. These articles will help: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm