|
|
Anthracnose (fungus) |
Round to irregular spots of various sizes on leaves. Color varies from yellow to brown with brown to purplish margins. |
Refer to the PDC Fact Sheet "Leaf Spot Diseases of Shade Trees and Ornamentals" for more information. Pick and remove spotted leaves where practical. Spray with fungicide in late spring and continue at 10- to 14-day inter vals. Use mancozeb + copper hydroxide, thiophanate-methyl or quaternary ammonium compounds. |
|
|
Holly leaf miner |
Pale squiggly lines on leaf. |
Pick off and destroy infested leaves in the fall or winter. This may be all that is needed for small trees and shrubs. If infestation is severe, carbaryl and imidacloprid are two of several insecticdes labeled for control of this pest. |
|
|
Oviposition injury (insect) |
Some leaf miners puncture leaves, leaving tiny wounds that often have no subsequent leaf mining associated with them. Similar to spine spot. |
No control. |
|
|
Spine spot (nonparasitic) |
Small, grayish-brown to dark punctures and scratches on both leaf surfaces in early spring. |
Spots caused by wounding of leaves by spines of nearby leaves during windy conditions. Re-locate plant to a sheltered location or erect wind barriers. |
|
| Leaf scorch (nonparasitic) |
 |
Irregular, scorched areas on leaves, especially near margins. |
Plant adapted varieties in sheltered locations or erect wind barriers. Use antidesiccants in winter. |
|
|
Winter injury (nonparasitic) |
Foliage brown and scorched. Twigs die back. Bark splitting. |
See leaf scorch. |
|
| University Outreach and Extension does not endorse commercial products. Follow the label on all pesticides. |
