← Back to the library
FIG.01 — Pith necrosis, diseaseTap to enlarge
Plant part
Leaf · Stem · Whole plant
P. persimilis
IPM USE WITH INTERVAL
DiseaseProblem 10 / 32
Pith necrosis
Symptoms
Internal stem pith becomes brown, hollow, and spongy; stunting, lower-stem lesions, and wilt may occur despite adequate soil moisture.
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 and destroy affected plants, improve airflow, and avoid excessive nitrogen and prolonged leaf wetness. Copper-based products may be labeled for bacterial suppression in some regions but are not a cure; verify diagnosis before spraying.
Active ingredients
copper hydroxide
Organic active ingredients
copper hydroxide
P. persimilis: allowed / avoid
PERSIMILIS STATUS: IPM USE WITH INTERVAL. Listed with a short pre-release interval; avoid untested combinations and verify the exact formulation.
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.
