B. Quarantine new plants and treat before placing them among established plants. C. Consider carefully if plant species particularly susceptible to spider mite infestations are worth their keep. Aphids feeding on plant sap cause leaves to become curled and crinkled. They also excrete a sticky substance called honeydew that may completely coat the foliage. Honeydew attracts ants and is a substrate for black sooty molds.
Aphids infest nearly all types of indoor, greenhouse, garden and ornamental plants.
Colonies are most commonly found on the shoots of new growth, but also may appear under leaves, on stems or on bulbs and roots. B. Use the botanical insecticides pyrethrins or neem. These predators can substantially help control aphids on greenhouse plants. B. Screening greenhouse vents, windows and doors helps prevent aphids from entering the greenhouse from the outside and helps prevent the escape of released beneficial organisms. C. Prune or pinch off heavily infested plant parts.