The jumping plant lice are nearly related to the tree hoppers, but they
do not look at all like them.
Under the magnifying glass they look like tiny cicadas.
See, here is a picture of one enlarged.
[Illustration]
Their natural size is no larger than a plant louse.
Have you not often seen them clustered close together on the young twigs
of pear trees--tiny, light-colored things that jumped in all directions
when you touched the twig?
The name of the plant louse that infests pear trees is the pear-tree
psylla. It is very destructive to pear trees, sucking out the juices of
the young shoots.
The pear trees can be saved by spraying them with kerosene emulsion as
soon as the young leaves have opened in the spring.