What are the white perfectly rectangular bright white, one fourth inch by one sixteen inch strips under my holly leaves? There are approx anywhere from ten to thirty of these on each leaf. There is also a tiny circle dot at one end. The dot is beige and the strips are chalky, leading me to guess it's a fungus. I am brushing them off leaf by leaf and rinsing with water and baking soda. Can this spread to other plants?
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/problems/pests/neem-oil-uses.htm