Psyllids are small winged insects called jumping plant lice. They are greenish or brownish and no more than 1/10″ long. They have antennae and clear wings that fold into a triangular shape and jump up when disturbed. They target acacia, boxwood, eucalyptus, laurel, magnolia, and pear trees. They will suck plant juices, weakening the foliage. The leaves may turn yellow, curl up and die. The honeydew excreted from the psyllids encourages a sticky black fungus called sooty mold which further disfigures and weakens stems and leaves. Clear away weeds and plant debris to remove hiding places. Treat leaves repeatedly with Malathion.