Psyllids are insects that
are related to
aphids. They form winged adults that are
small and brownish to green in color. When they spring
into flight, they are propelled by powerful hind legs.
The immature form of the
psyllid is wingless and is often covered with white,
waxy threads or drops of
honeydew. They damage plants by
sucking sap of shoots and leaves. This often leaves
these parts distorted and stunted. In extreme cases, the
tips of stems may die.
As with many sucking
insects, psyllids may sometimes transmit virus and other
diseases from plant to plant. Some types form galls on
leaves and the immature forms feed on the inside of the
The control of psyllids
is similar to that for aphids.