Lilac: Bacterial blight categories: Lilac Lilac Diseases Ornamentals Shrubs revision date: 2023-02-09 12:00 Lilac bacterial blight (1)Photo by: J.R. Glass Biology Bacterial blight starts as brown spots on leaves and stems in the early spring. These spots become black with age and cause death of leaves and young shoots, which may bend over at the […]
Lilac: Powdery mildew categories: Lilac Lilac Diseases Ornamentals Shrubs revision date: 2023-02-09 12:00 Powdery mildew on lilacPhoto by: C.R. Foss Biology Powdery mildew is a fungal disease of the leaves. On lilac, it shows typical powdery gray-white growth on the upper leaf surface. Powdery mildew usually occurs fairly late in the season, and does relatively […]
Lilac: Lilac borer categories: Lilac Lilac Insects Ornamentals Shrubs revision date: 2022-12-03 12:00 ash borer pupal ‘skeleton’Photo by: A.L. Antonelli Biology The lilac borer, also known as the ash borer, is a member of the clearwing moth family. The adults of many clearwing moths mimic yellowjackets or paper wasps. The larvae of this moth cause […]
Lilac: Lilac leafminer categories: Lilac Lilac Insects Ornamentals Shrubs revision date: 2022-12-03 12:00 Lilac leafminer damagePhoto by: R.S. Byther Biology Leafminers feed by removing green tissue from between the upper and lower surfaces of the leaves. Symptoms of feeding by the green larvae include large brown blotches which may distort the leaves. The adult lilac […]
Lilac: Oystershell scale categories: Lilac Lilac Insects Ornamentals Shrubs revision date: 2022-12-03 12:00 Severe oystershell scale infestation on twigPhoto by: Unknown Biology Oystershell scale insects are usually found on trunks, branches, and twigs. They occur less frequently on the leaves and other plant parts. The mature scale is approximately 1/8″ long, striped with grayish and […]