256 MONTANA EXPERIMENT STATION. 



lays as many as 450 eggs. Gather and destroy all the stung plums 

 l)eforc the grubs escape. Spray heavily with arsenate of lead be- 

 fore the blossoms are out. 



28, The Plum Curculio. 



The beetles make a crescent-shaped slit on the fruit of the plum. 

 The larva feds in the young fruit causing it to drop. Said to be in 

 the Bitter Root valley. 



Remedy. — Spray thoroughly with arsenical insecticides before 

 the leaves open. Jar the trees in the early morning catching the bee- 

 tles on canvas or a sh^et and destroying them by burning or cruch- 

 ing. Promptly gather and destroy fallen fruit. 



29, Plum Aphis. 



Numerous pale-green lice on tender shoots of plum. Common 

 in Montana, sometimes injurious. 



Remedy — Treat as for apple aphis, but use extra precaution as 

 the plum foliage is much more liable to be injured by insecticides. 

 30, The Box Elder Plant-bug. 



Sometimes very injurious to foliage and fruit of plum and 

 prunes. Feeds primarily on box elder. Red and black bugs with 

 a long, jointed snout 



Remedy. — Spray with kerosene emulsion to kill the young in- 

 sects. It is sometimes necessary to remove neighboring box elder 

 trees for the sake of doing away with the breeding place of the 

 insects. 



INSECTS INJURIOUS TO THB STRAWBERRY. 



31, The Strawberry Leaf-roller. 



Generally distributed in Montana, and at times a destructive 

 species. Feeds on strawberry, blackberry, raspberry and other 

 plants. Rolls or crumples the foliage. Larvae small, greenish in 

 color. 



Remedy. — After harvesting the crop, mow the vines, leaving 

 them to dry. Then burn them. If there are enough vines to burn 

 well first put some hay or straw over the field. If preferred vines 

 may be sprayed with arsenate of lead after harvesting the fruit. 



32, The Tarnished Plant-bug. 



Common throughout the state. Native to Montana, feeding on 

 many wild plants. About one-fourth of an inch in length, variable 



