Signs of Disease, Pests, or Stress
Leaf Issues
Signs:
• Yellowing or browning leaves
• Curling, wilting, or drooping
• Spots (brown, black, or white)
• Holes, ragged edges, or chewed areas
• Powdery white coating or sticky residue
What it could mean:
• Yellowing = nutrient deficiency, overwatering, poor drainage
• Spots or mildew = fungal or bacterial disease
• Holes or chewed leaves = caterpillars, beetles, snails, or slugs
• Sticky residue = aphids or whiteflies
What to do:
• Remove damaged or infected leaves (prune cleanly)
• Apply neem oil, insecticidal soap, or compost tea if pests or fungus are present
• Improve air circulation and avoid overhead watering
• Check soil drainage and adjust watering schedule
Pest Presence
Signs:
• Clusters of small insects under leaves (aphids, mites)
• Webbing (spider mites)
• Holes in fruit or stems (borers, caterpillars)
• Ants (they often “farm” aphids)
• Slime trails (slugs/snails)
What to do:
• Remove pests by hand when possible (early morning or evening is best)
• Spray with organic pest control (e.g. neem oil, soapy water)
• Use row covers, sticky traps, or natural predators (ladybugs, lacewings)
• Keep garden tidy to reduce pest hiding spots
Environmental Stress
Signs:
• Wilting (despite watering)
• Leaf scorch or sunburn (brown edges or white patches)
• Stunted growth or pale leaves
• Plants bolting early (flowering prematurely)
What to do:
• Provide shade during hottest parts of the day (especially in Arizona)
• Mulch to help retain soil moisture and regulate root temperature
• Water deeply but less frequently to encourage strong root growth
• Harvest stressed plants early if needed and replant at a better time
Root or Soil Issues
Signs:
• Persistent wilting even with adequate water
• Slow or no growth
• Foul smell or mushy base at the plant stem
What to do:
• Check for root rot (dig gently to inspect roots)
• Amend soil with compost for better drainage and nutrients
• Avoid overwatering, especially in clay or compacted soils
• Replace soil in containers annually if it’s tired or compacted
Tips
Effective Plant Inspections:
- Check early in the day when pests are less active and plants are hydrated
- Look under leaves and along stems, not just at the top
- Carry scissors, gloves, and a spray bottle of neem or soapy water
- Act early—catching issues in the first 24–48 hours often saves the plant