Cobwebs on Meyer Lemon: Spider Mites or Beneficial Spiders?

Fine cobwebs at stem junctions on a Meyer lemon, with yellowing leaves, suggest spider mites — but not all webbing is bad. True spider mites produce fine, dense webbing and cause stippling, yellowing, and leaf drop. Beneficial spiders also spin webs but don't damage plants.

How to Tell the Difference

• Spider mites: Tiny (barely visible), often red/brown/green. Tap a leaf over white paper — moving specks = mites. Look for yellow/brown stippling between veins.
• Beneficial spiders: Larger, solitary, no stippling. Webs are more structured (orb or funnel).
• Eastern tent caterpillars / fall webworms: Make dense silken tents in branch crotches; caterpillars visible inside.

If Spider Mites Confirmed

• Spray horticultural oil or neem oil weekly for 3–4 weeks, covering undersides thoroughly.
• Increase humidity — mist daily or use pebble tray.
• Hose down plant (outdoors) to dislodge mites before spraying.

Yellow Leaves? Check Water and Fruit Load

Citrus often drops interior leaves when setting fruit or if water-stressed. Ensure consistent moisture (not soggy) and consider thinning fruit if tree is small.

Monitor weekly. If no mites found and webbing is sparse, it's likely beneficial spiders — leave them be.