Insects Injurious to the Fruit of the Apple 



1913 



The female moth lays her eggs in flat masses usually on the twigs and 

 smaller branches. In New York most of the eggs are laid by the last 

 of June, but they do not 

 hatch until the following 

 spring. There is only one 

 brood annually, about ten 

 months being spent in the 

 egg stage. 



Means of control. — The 

 fruit-tree leaf-roller has 

 been found to be a diffi- 

 cult insect to control. It 

 often happens that its 



most destructive out- p,^ ,^ t r » j u ^ ■. . , r „ 



Jr'iG. 121. — Leaf rolled by fruit-tree leaf-roller 



breaks occur in well- 

 sprayed, weU-cared-for orchards. This is because the eggs are not injured 

 by the lime-sulfur spray usually applied, and because the caterpillars 

 feed in the open only for a short time after the buds have burst, at 

 which time no arsenical is ordinarily applied to the trees. Thus this 

 insect is able to escape the applications usually given in a spraying 

 schedule. 



The method employed in controlling the leaf roller will depend entirely 

 on the amount of infestation. This can be estimated by the amount 

 of injury done to the crop of the preceding year or less readily by an 

 examination of the trees for egg inasses. In cases where only a moderate 



infestation is in- 

 dicated, a reason- 

 able degree of 

 control can be 

 obtained by thor- 

 ough spraying 

 with arsenate of 

 lead, 2I to 3 

 pounds in 100 

 gallons of water. 

 This should be 

 applied as soon 

 as the leaves of 



Fig. 122.— Moth of fruit-tree leaf -roller the cluster buds 



begin to open. 

 In cases of severe infestation, experience has shown that the pest can- 

 not be controlled by the use of arsenical sprays alone. In such cases 



