How to Manage Pests
UC Pest Management Guidelines
Cladosporium Leaf Spot
Pathogen: Cladosporium variabile
In this Guideline:
Cladosporium leaf spot is characterized by round, tan leaf spots
that rarely exceed 0.25 inch in diameter. Dark green spores and mycelium later
develop in the centers of these spots. The presence of dark green sporulation
distinguishes Cladosporium leaf spot from anthracnose and Stemphylium leaf spot
diseases, both of which also form circular lesions.
Cladosporium leaf spot occurs to some extent almost every year.
However, the disease is rarely severe unless there are significant rains in
spring. Weed or other reservoir hosts have not been identified. This pathogen is seedborne.
Treatment is rarely necessary. If used, copper sprays must be
applied as protectants.
|When choosing a pesticide, consider information relating to
environmental impact. Not all registered pesticides are listed. Always read
label of product being used.
||MODE OF ACTION GROUP NAME (NUMBER1): Multi-site contact (M1)
||COMMENTS: Copper sprays are not very effective. Apply as a
protectant spray at 10–14 day intervals. Rate often depends upon
disease severity. A suitable agricultural spray oil is recommended for use
with some copper formulations. Consult label for specific application guidelines.
UC IPM Pest Management Guidelines: Spinach
UC ANR Publication 3467
M. LeStrange, UC Cooperative Extension, Tulare County
S. T. Koike, UC Cooperative Extension, Monterey County
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