Fungal growth from stagnant moisture. Immediate steps:
Mildew, mold, fungus all thrive in standing water. Fix the water, fix the problem.
White Cottony Sticky Infestation: Mealybugs or Woolly Aphids?
Mystery White Balls on Pepper Plants: Get an Identification First
White Raised Spots on Ornamentals: Wax Scale Insects
King Sago White Spots: Scale or Aphids—Check Asian Cycad Scale
Corn Cane White Fluffy Dust: Pollen, Mites, Scale, or Mildew?
Hibiscus White Pest Complex: Atomic Grow Organic Health Approach
White Spots on Tulip Tree: Lichens or Scale—Harmless or Treatable
Saving Basil from Whiteflies: Organic Control and Care Tips
White Powdery Spots on Maple Leaf Undersides: Likely Insects
White Spots on Red Maple: Superficial Fungus/Algae, Not Harmful
White Mold Spreading on Ferns: Powdery Mildew or Mealybugs?
Zucchini Powdery Mildew: Identification and Milk Spray Treatment
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