Cladosporium forsythiae

Leaf Spot on Forsythia

Description

Leaf Spot on Forsythia Cladosporium forsythiae. Forsythia (Forsythia x intermedia) can experience leaf spot infections during the summer, characterized by the appearance of yellow, sometimes oily spots on the leaves. The affected tissue may bulge, resembling blisters, and will eventually die. The edges of the leaves deform and turn brown as a result of the infection. In severe cases, there can be significant leaf drop, leading to subsequent dieback of branches. Cladosporium forsythiae thrives in humid and warm conditions, which can enhance its infectivity and the severity of the disease. Therefore, managing humidity and moisture on the foliage is crucial for controlling its spread.

Symptom

Brown spots on the leaves appear as yellow, sometimes oily patches. The affected tissue may bulge, resembling blisters, and will eventually die. The edges of the leaves deform and turn brown as a result of the infection. In severe cases, there can be significant leaf drop, leading to subsequent dieback of branches.

Tree Species: Forsythia

Part of a plant- attacked: Leaf / Needle, Branch

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: Yes

Present in EU: Yes