TWENTY- SIXTH REPORT OF STATE ENTOMOLOGIST 



33 



A number of species of caterpillars have been found on the 

 leaves of the young trees. No one species is numerous enough 

 to demand attention but the combined feeding of these forms 

 is a serious drain on the vitality of the growing trees. A cover- 

 ing of lead arsenate spray 2 pounds to 100 gallons of water plus 

 1 pound of spreader applied after the trees came into full leaf 

 would check most of this damage. The feeding is confined 

 largely to the mature leaves rather than the growing tips. This 



Figure 5. — Larvae of the cherry saw-fly. 



spray would also take care of the slugs although a second appli- 

 cation would probably be needed in late July or August for the 

 second brood of slugs. 



Old orchards suffer somewhat from the same insects but 

 where sprays for codling moth are applied they ceased to be of 

 importance on apple trees. Cherry fruit-fly sprays are an aid 

 to old cherry trees in this respect. 



SMALL FRUIT INSECTS 



The Strawberry Root Weevil ( Brachyrhinus ovatus L.j is 

 the major insect pest of western Montana strawberries. In the 

 grub stage it attacks the roots and crowns of the plants. The 

 adult beetles feed on the leaves and fruit. A cultural program 

 allowing the berry plants to grow only two seasons, plowing 

 them under in the fall of the second season, and growing a cover 



