Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001840
01/01/98
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.
Delphinium
Disease Problems
Powdery Mildew
controls - Sulfur
Insect Problems
Aphids
controls - Malathion, pyrethrins
Spider mites
controls - Insecticidal soap, malathion