Psyllids

Identification

Size: 2–5 mm long

Color: Green, brown, or yellow depending on species

Description: Psyllids are small, sap-feeding insects that resemble tiny cicadas. They are commonly found on trees and shrubs where they feed on plant juices. Their feeding can cause leaf damage and distortion, especially during active growing seasons.

Psyllids are outdoor pests that primarily affect trees and shrubs, including species such as ash, boxwood, and fruit trees. They have small, winged bodies and are known for their jumping ability, which is similar to fleas. Both adults and immature stages feed on plant sap.

As psyllids feed, they inject toxins into plant tissue, which can cause leaves to curl, twist, or form abnormal growths. This feeding damage can weaken the plant and reduce its overall health, especially during heavy infestations. Some species also produce honeydew, a sticky substance that can lead to sooty mold growth.

Psyllids are most active during spring and summer when plants are actively growing. They reproduce quickly and can build up large populations in a short period. Early detection is important to limit damage and prevent spread to nearby plants.

Psyllids are small insects that can be difficult to spot at first. They are often noticed by their movement, as they jump or fly away quickly when disturbed.

Look for tiny, winged insects on leaves and stems. You may also notice distorted or curled leaves, which are a common result of their feeding activity. Sticky residue on leaves can also indicate their presence.

Small jumping or flying insects on plants
Curled, twisted, or distorted leaves
Sticky honeydew on leaf surfaces
Presence of sooty mold on affected areas
Clusters of insects on new plant growth

Psyllid infestations often appear as damage to new plant growth. Leaves may curl, thicken, or develop unusual shapes as a result of feeding.

You may also notice a sticky coating on leaves or nearby surfaces caused by honeydew. In some cases, black sooty mold may grow on this residue, making the problem more visible.

Regular monitoring of plants during the growing season can help detect psyllids early. Focus on new growth, where these insects are most likely to feed and reproduce.

Maintaining plant health through proper watering, pruning, and spacing can reduce susceptibility to infestations. Removing heavily affected plant material can also help limit the spread.

For persistent or severe infestations, professional pest control services can provide effective treatment and ongoing protection for your landscape.