Insects and Insecticides. 
15 
our orchards and all should be on the look out for it so as to do all 
possible to stamp it out or prevent its rapid spread. It is to the 
European varieties of plums what the codling moth is to the apples, 
only worse. The beetle is brown to blackish in color, is about one- 
fifth of an inch long and has two prominent humps and numerous 
smaller ones upon its wing covers. The beetle makes a crescent¬ 
shaped cut in the flesh of the fruit where an egg is deposited and 
the grub does not enter the pit but feeds on the flesh outside of it, 
causing the fruit to fall. 
Remedies .—Jarring and spraying as in case of the preceding species. 
Should anyone find what he thinks to be the work of this 
insect in his orchard, it is hoped he will notify the Experiment 
Station at once. 
ATTACKING THE FOLIAGE. 
fruit-tree leaf-roller. ( Cacoscia drgyrospild) 
See under apple insects. Use the poisons only two-thirds as 
strong on the plum as on the apple. Arsenate of lead is probably 
least likely to injure the foliage. 
SLUGS. 
Skeletonizing the upper surface of the leaves. See pear-tree 
slug. Use the same remedies. 
BROWN MITE. 
See under apple insects. Remedies the same. 
PLANT LICE. 
Two or three species attack the foliage of the plum badly in 
Colorado. Remedies the same as for apple plant-louse. 
Other insects attacking apple foliage may be found on plum, 
where they are destroyed by the same treatment in either case. 
ATTACKING TRUNK AND BRANCHES. 
the peach borer. ( Sdnnind exitiosd.) 
This insect often attacks the plum. For its treatment see 
peach enemies. 
flat-headed borer. 
See under apple enemies. 
SCALE INSECTS. 
See under apple enemies. When scales are found it will be 
well to send specimens to the Experiment Station for identification 
and advice. Howard’s scale and Putnam’s scale both occur on 
plum in the State. They have been injuriously abundant in a few 
isolated cases only. 
