woolly aphids sucking sap from woody stem

agriculture american animal aphid apple biological blight branch bug closeup colony control crops damage dangerous defense disease eggs eriosoma exterminator garden gardening home honeydew horticulture host immovable insect insecticides invasive killer lanigerum larvae laurel leaf lice louse macro mealybugs nature nymphs parasite parasitoid pest pesticide pests plague plant plants population problem repellent sac sap scale small spotting sticky suck tree vermin vigor wilting woolly