Grower Guide
Cannabis leaf spots and lesions: preserve distribution, surfaces, and timing
Spots and lesions can overlap across physical damage, residue, spray response, pests, pathogens, environment, root-zone problems, and nutrition. A single photograph should not turn that overlap into certainty. Record the distribution and compare how the pattern changes.
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Swipe horizontally, or focus this table and use the arrow keys, to compare all four evidence columns.
| Visible pattern | Evidence to compare | What to log next | What not to assume |
|---|---|---|---|
| Spots / lesions | Distribution, Leaf surfaces, Watering and feeding, Environment | Distribution, both leaf surfaces, progression, repeatable photos, and scouting observations. | Spots alone do not identify a pest, pathogen, or deficiency. |
Photograph both leaf surfaces
Capture affected and unaffected leaves, the upper and lower surface, the wider plant, and the neighboring plant if relevant. Record whether marks rub off, cross veins, have sharp or diffuse edges, or are paired with insects, webbing, eggs, residue, or odor without treating any one clue as a confirmed cause.
Check distribution and room context
Map whether spots occur on one plant, one canopy zone, multiple plants, or near an airflow, splash, or contact point. Review same-tent temperature, humidity, condensation, and scouting records while keeping manual and stale evidence clearly labeled.
Compare recent plant inputs
Review the same plant's watering, feeding, foliar contact, handling, and cleaning history. If a record is absent, label the evidence limited instead of saying the event did not happen.
Avoid stacked corrections
Avoid changing feeding, watering, lighting, and airflow at the same time. Preserve a baseline, change one justified variable, and record the response.
Common questions
Keep reading
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