Do Not Increase Plant Susceptibility To Problems Through
DO NOT INCREASE PLANT SUSCEPTIBILITY TO PROBLEMS THROUGH NEGLECT OR IMPROPER CARE. Additional information is in Extension bulletin E-1936, "Selecting Ornamental Plants" and
List of files and visuals associated with this text.
Extension bulletin E-1947, "Planting and Care of Ornamental Landscape Plants."
All plants can be affected by environmental and cultural problems. Only those occurring most frequently are listed here. Use pesticides only after an accurate diagnosis and control recommendation have been made. Use pesticides strictly in accordance with label directions. Always wear protective clothing and do not spray on windy days.
This list is for educational purposes only. Inclusion does not imply endorsement and omission does not imply discrimination. Not all of these pesticides are labeled or recommended in all states.
Oak (Quercus) Cultural Problems Specific soil requirement Transplanting difficulties
Environmental Problems Nutrient deficiency (iron)
Disease Problems Anthracnose control - benomyl (chlorothalonil- red oak only), bordeaux mixture Canker no chemical control Crown gall no chemical control Leaf blister control - copper (chlorothalonil - red oak only) Leaf rust no chemical control Leaf spot, fungal control - benomyl, bordeaux mixture (chlorothalonil - red oak only) Mushroom-shoestring root rot no chemical control Oak wilt no chemical control Powdery mildew control - benomyl, lime-sulfur, triadimefon Scorch no chemical control Twig blight, canker no chemical control Wood rot (decay) no chemical control
Insect Problems Aphids control - diazinon, acephate, insecticidal soap
Beetle borers control - Caterpillars control - diazinon, carbaryl, malathion, pyrethrum, Bacillus thuringiensis Erineum and rust mites control - sulfur, carbaryl Fall webworms control - diazinon, carbaryl, Bacillus thuringiensis, pyrethrum Gall midges control - carbaryl, acephate Gall wasps control - diazinon, carbaryl, malathion, pyrethrum Lace bugs control - acephate, malathion, pyrethrum
Leafhoppers control - diazinon, acephate, malathion, pyrethrum,
Sawflies control - diazinon, carbaryl, acephate, rotenone, malathion, pyrethrum Scales control - adults: superior oil
crawlers: diazinon, acephate, pyrethrum, malathion, superior oil Spider mites control - malathion, superior oil, insecticidal soap Tent caterpillars control - diazinon, carbaryl, malathion, pyrethrum, Bacillus thuringiensis
