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White Stuff on Leaves: Mealybugs, Not Fungus

Powdery White Deposits on Plants: Mealybugs vs. Powdery Mildew

White matter on leaves is more often mealybugs than fungus. Here's how to tell:

If It's Mealybugs

Follow the mealybug protocol: isolate, prune heavy infestations, spray thoroughly with alcohol solution (1:5 water) or insecticidal soap, repeat in 5–7 days, monitor weekly.

If It's Powdery Mildew

  • Improve air circulation.
  • Reduce humidity.
  • Spray with 1 tbsp baking soda + 1 tsp horticultural oil per gallon water, or neem oil.
  • Remove severely affected leaves.

Next Step

Email a close-up photo for confirmation. Treatment differs completely.

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FeatureMealybugsPowdery Mildew
AppearanceCottony clumps in leaf axils, on stemsUniform dusty coating on leaf surfaces
TextureWaxy, sticky, removable clumpsDry, powdery, wipes off
LocationHidden spots: stem joints, undersidesOpen leaf surfaces
Plant effectStunted growth, honeydew, sooty moldDistorted leaves, yellowing