6.  Peach Twig Borer
New growth at the tips of the twigs wilts and dies. When the affected twigs are sliced open lengthwise, worms about ½ inch long are found inside. The reddish brown color of these worm distinguishes them from Oriental fruit moth worms, which cause similar damage. Later in the season, some of the maturing fruit when cut open are also found to contain these worms. During the summer, there may be cocoons attached to the branches or tree crotches.