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.
Elm (Ulmus) Disease Problems Canker no chemical control Dutch Elm disease no chemical control Leaf curl control - bordeaux mixture Leaf spot, black control - oil and lime-sulfur Leaf spot, fungal control - benomyl, bordeaux mixture Powdery mildew control - benomyl, lime-sulfur, triadimefon Root rot no chemical control Slime flux, wetwood no chemical control Verticillium wilt no chemical control Wood rot (decay) no chemical control
Insect Problems Aphids control - diazinon, insecticidal soap
Bagworms control - carbaryl, Bacillus thuringiensis Cankerworms control - diazinon, carbaryl, Bacillus thuringiensis, pyrethrum Elm bark beetles control - carbaryl Elm leaf beetles control - diazinon, carbaryl, rotenone, pyrethrum
Fall webworms control - diazinon, carbaryl, Bacillus thuringiensis, pyrethrum Scarab beetle adults control - diazinon, pyrethrum Spider mites control - superior oil, insecticidal soap
Spiny elm caterpillars control - diazinon, carbaryl, Bacillus thuringiensis, pyrethrum Controls reported to cause plant injury - acephate, malathion
Visuals associated with this text.
| Visual title - Visual size | Visual title - Visual size |
|---|---|
| Dutch elm disease on elm - 66K | Elm leaf beetle - 27K |
| Elm leaf beetle larva, close up - 36K | Elm leaf beetle eggs - 35K |
| Elm case bearer - 27K | Elm span worm - 8K |
| Slime flux or wetwood, internal symptoms - 53K | Slime flux on elm - 53K |
