Aphids (likely cannabis aphid)

Colonies cluster on tender shoots, leaf undersides, and new growth of greenhouse and outdoor plants. The pictured infestation is consistent with aphids on cannabis or a related plant.

They pierce phloem tissue and suck plant sap, producing sticky honeydew that can support sooty mold.

Aphids reproduce rapidly, often parthenogenetically, and may form dense colonies. Winged adults develop when crowded or the host is deteriorating, dispersing to new plants.

They cause curling, yellowing, stunted growth, and may transmit plant viruses. They are also important prey for lady beetles, lacewings, hoverfly larvae, and parasitoid wasps.