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FIG.01 — Septoria leaf spot, diseaseTap to enlarge
Plant part
Leaf
P. persimilis
RESTRICTED
DiseaseProblem 02 / 32
Septoria leaf spot
Symptoms
Small circular gray-to-tan lesions with dark margins and tiny black dots; starts on lower leaves, followed by yellowing and leaf drop.
How to verify
Compare the photos above with the plant, and check the symptom description against the look-alike records below before acting. The source guide does not carry a separate laboratory verification note for this record.
Next step
Remove affected lower foliage and debris; avoid overhead irrigation and work with dry plants. Use a labeled protectant such as chlorothalonil, copper, or an approved triazole/strobulurin product according to the local label.
Active ingredients
chlorothalonilcopper hydroxidetribasic copper sulfatecopper sulfate pentahydratemancozeb
Organic active ingredients
copper hydroxidecopper oxychloride
P. persimilis: allowed / avoid
PERSIMILIS STATUS: RESTRICTED. Mancozeb can damage beneficial mites; use before release and allow at least 7 days before releasing Phytoseiulus persimilis.
Label matters
Active ingredients below are examples, not universal prescriptions. Confirm the diagnosis; use only products registered for tomato and the target problem in your country; and follow the current label for dose, pre-harvest interval, worker protection, compatibility and re-entry. Rotate IRAC/FRAC modes of action. When symptoms are uncertain, obtain a laboratory or extension diagnosis. Integrated pest management (IPM)—sanitation, resistant varieties, irrigation management, monitoring and biological control—should be the first line of defense.
Look-alikes to rule out
