Observe before treating
Start with the symptom. Keep more than one cause open.
A yellow leaf, wilted stem, or chewed edge is evidence, not a diagnosis. Use the questions to narrow possibilities before changing water, nutrients, or controls.
Start with what you can see
Possible causes, not a diagnosis
Yellow leaves
Leaves lose green color between veins, from the edges, or across the entire blade.
Check first
- Are the oldest or newest leaves affected first?
- Is the root zone wet, dry, or compacted?
- Is yellowing uniform or patterned?
- Did conditions change recently?
Low-risk next steps
- Check moisture below the surface before watering.
- Remove only badly damaged foliage.
- Review drainage and recent fertilizer use.
- Compare the pattern with crop-specific extension guidance.
Identify pests and diseases before choosing a control. Follow the current product label, protect pollinators, keep products away from children and animals, and use local extension guidance when food crops are involved.