sooty mold disease on lemon leaves

affectation agriculture animal black branch bug capnodiaceae capnodiales citrus closeup coating colony control crops damage dangerous dead destroy disease dry effect exterminator family farmer foliage garden gardening honeydew insect invasive killer laurel laurus leaf macro mealybugs mold nobilis nymphs orange parasite parasitoid pest pests plant population problem sooty spotting sticky suck vegetable