Honeydew Causes and Persistence: Insect-Driven, Not Weather

Follow-up on honeydew question: what causes it besides bugs? Cooler summer? Goes away without treatment?

Answer

Honeydew only from sucking insects (aphids, scale) feeding on plant juices. Continues until insects stop or die.

Cool weather (fall/winter) kills aphids. Scale insects often survive cold. No treatment = honeydew persists while insects active.

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