close up rhododendron plant with disease on leaves

agriculture aphid azalea bloom blossom botany brown burn bushes canker chancroid chlorosis chlorotic cinnamony closeup cshaped damage dieback disease diseased ericaceae fungal fungi fungus fusarium garden gardening growth infection insect iron leaf leaves macro mealybug mildew mushroom nature notch outdoor oxysporum parasite pathology pesticide phytology phytophthora plant rands rhododendron sap spitermites spot spots weevils winter