Greenhouse Pest Crisis: Black Spots and White Egg Sacs on Palms, Ficus, Philodendron

Diagnosing and Treating a Mixed Greenhouse Infestation

Logan manages a neglected greenhouse with 33 palms, 15 ficus, and a large philodendron showing black spots and tiny white egg sacs on leaf undersides. The owner suggested three different sprays.

Expert Assessment

Symptoms don't match a common known pest. Photos are essential for ID. The problem may be region-specific. Indiscriminate spraying with multiple products (insecticidal soap, Orthene, fungicide) is never advised—target the specific pest/pathogen after identification.

Immediate Steps

• Send clear photos of spots and sacs to an expert.
• Note if greenhouse is open to outdoors and your location.
• Isolate affected plants (planned for next week).
• Seaweed extract is a nutrient, not a pesticide.