642 



THE MONTHLY BULLETIN. 





.«& '•* 





Fig. 359.- — General view of orchard in wliich tree in Fig. 360 was photographed, 

 showing defoliation of the fruit trees. The trees with the heavy foliage are elms, 

 and were not attacked by the leaf-roller. (After Gillette and Weldon, Cir. 5, 

 Colo. State Ent.) 



Food Plants. 



The fruit-tree leaf-roller is principally a fruit pest as its name indi- 

 cates ; it is quite an omniverous feeder, however, and may be found 

 eating the foliage of many shade trees as well as herbaceous plants. 

 Fig. 359 shows some elm trees which were not attacked alongside an 

 apple orchard in which the foliage had practically all been destroyed 

 at the time the picture was taken. In Circular 5, from Office of State 

 Entomologist of Colorado, the following list of trees and plants which 

 larva? were found feeding upon is given : plum, cherry, pear, currant, 

 gooseberry, raspberry, rose, poplar, elm, locust, alfalfa and onion. The 

 alfalfa and onions were growing between tree rows where the larvae had 

 practically eaten all the leaves, and upon dropping to the ground webs 

 were spun over everything with which they came in contact, and more 

 or less feeding took place on all kinds of green plants. Fig. 360 

 illustrates this condition quite well. 



Injury. 



Something has already been said about the injury done to orchards 

 by the leaf-roller. This injury assumes several different forms — - 



1. The blossoms are partly or wholly destroyed very early In the season. 



2. The fruit and foliage are partly or wholly destroyed somewhat later. 



3. The next season's crop is destroyed as well as the current season's. 



The first form of injury which results in the destruction of the fruit 

 also comes as a result of an abundance of worms which hatch very 



