208 MONTANA EXPERIMENT STATION. 



There seems to be some promise of good results from the use of 

 summer sprays applied at the time the eggs are hatching. As is 

 indicated en a previous page, the very young larva on hatching from 

 the egg passes to the under side of some leaf where it spins a delicate 

 tube from the end of which it issues for getting its food which it 

 takes from the surface parts of the leaf. If this part of the leaf be 

 coated with a poison, the treatment should be successful. It would 

 be necessary to get the coating on before the larva spins its web on 

 the surface. The spray should be directed against the under side of 

 the leaves. 



For this purpose we recommend the use of arsenate of lead in pre- 

 ference to Paris gieen on account of the much greater adhesive 

 quality of the former insecticide. Arsenate of lead sticks to the foli- 

 age through severe rain storms and when applied in the spring may 

 be found still adhering in the fall giving a whitish color to the leaves. 

 For this reason it has a particular advantage in the treatment of the 

 newly hatched larvae of the bud moth. 



In controlling the insect we recommend the following: 



(i). Pick by hand and destroy the nests on nursery and young 

 orchard trees. 



(2). Spray thoroughly with arsenate of lead in the spring of the 

 year just as the buds are expanding. 



3). Spray thoroughly with arsenate of lead about June 15.. Give 

 particular attention to coating the under surface of the foliage. 



CONCLUSION. 



This is a serious insect pest and one that the fruit grower would 

 do well to become familiar with and suppress before it takes pos- 

 session of his orchard. 



