Plant Pest & Disease Diagnostic Checklist

Why use this checklist

Use this diagnostic checklist when a plant has spots, wilting, sticky residue, webbing, yellow leaves, mushy stems, or unexplained decline. Those symptoms overlap across pests, fungal disease, bacterial issues, root rot, underwatering, and light stress, so the useful move is to identify the pattern before reaching for spray, scissors, or the watering can.

The checklist is meant to slow the decision down just enough to separate “needs treatment” from “needs better conditions.” That matters because a plant with root rot does not need more water, and a plant with spider mites does not need a lecture about vibes.

What to inspect

• Leaf tops and undersides for stippling, webbing, sticky residue, scale bumps, or powdery growth.
• Stems and crowns for softness, blackened tissue, collapse, or active insects.
• Soil surface for fungus, sour smell, standing moisture, or pests moving when disturbed.
• Recent care changes: repotting, overwatering, low light, drafts, or a new plant brought nearby.
• Spread pattern: one damaged leaf is different from symptoms moving across the whole plant.

How to use the result

If pest signs are visible, isolate the plant before treatment. If the soil smells sour or the plant wilts while wet, inspect roots before adding anything else. If symptoms are mostly spots or lesions, remove the worst leaves, improve airflow, and confirm whether disease is spreading before choosing a spray.

For pest-specific inspection, use the spider mite identification guide. For disease pattern matching, compare symptoms with the plant disease identification guide.

Recommended Next Step

Take clear photos of the top and underside of affected leaves, isolate the plant for 7-10 days, and recheck the same symptoms twice before escalating treatment. If the damage spreads quickly or the roots are failing, move from checklist mode to a full root or disease diagnosis.

Routing Context

This page belongs in the broader utility cluster workflow. Use the result here as the quick checkpoint, then connect it back to the surrounding planning material before making a final decision. A useful tool should answer one practical question, show the tradeoff clearly, and point you toward the next page instead of leaving you at a dead end.

For related next steps, start from the resource library or compare it with the tool collection. That keeps the utility cluster path connected across calculators, checklists, and supporting guides.