18 THE COLORADO EXPERIMENT STATION 
strong on the plum as on the apple. Arsenate of lead is 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 (Scinninoidea exitiosa.) 
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 identifica¬ 
tion and advice. Howards’s scale and Putnam’s scale both occur 
on plum in the State. They have been injuriously abundant in a 
few isolated cases only. 
INSECTS INJURIOUS TO THE CHERRY. 
The insects attacking the cherry in Colorado are the Fruit- 
tree Leaf-roller, Tent Caterpillar, Fall Web-worm, Brown Mite, 
Plant Lice, Scale Insects, Grasshoppers, Flat-headed Borer, Twig 
Borer, Buffalo Tree-hoppers and Pear Slug mentioned above. 
INSECTS INJURIOUS TO THE PEACH. 
PEACH TWIG-BORER. (Anarsia lineatella.) 
This is the worst insect enemy of the peach in Colorado at the 
present time. As soon as the buds begin to open in the spring, a 
small brownish larva with a black head eats into the buds and 
