1930] Praca Currurk IN CALIFORNIA 43

trees showing low vigor. The whitish larvae, having a flattened portion
just behind the head, hatch in the spring and mine the inner bark
and sapwood and may girdle the branch or trunk. Prevent sunburn
by proper pruning and whitewashing, and avoid injuries or wounds
to the tree. Keep the tree vigorously growing by supplying sufficient
water and thus discourage egg laying by the beetles. When borers are
in the tree the only feasible control is digging them out.

Fig. 12.—Fruit damaged by peach twig-borer, showing surface injury.
(From California Agr. Exp. Sta. Bul. 355.)

Peach Twig-Borer, Anarsia lineatella Zell —This is a small reddishbrown
 caterpillar about one-half inch long, which burrows into and
kills buds and twigs, and may infest the fruit. The larvae hibernate
just beneath the bark in crotches of the smaller branches, and emerge
in the early spring to infest buds and new shoots. Later they change
to tiny moths which fly about the orchard depositing eggs. These give