EXPKIUMENT STATION BULLETINS. 



289 



Fig. 3.— Flat headed Apple-tree Borer, from C. V. Riley, Insects of Mo., 1st Rep. 



for the most part, between the bark and the sapwood, although the tunnel some- 

 times is cut deeper just before completion. The flat-headed borer does not con- 

 fine its work to the crown of the trees, but may be found working in any part 

 of the trunk and sometimes in the larger branches. The range of food plants 

 is quite extended, covering besides the apple, white oak, mountain ash, box 

 elder, peach, pear, basswood, soft maple, cherry and plum. 



BEMEDIES. 



The same remedies that are recommended against the round-headed borer 

 are useful against the flat-headed species. 



AFFECTING THE BRANCHES. 



The Buffalo Tree-hopper. (Geresa duhalis.) 



A small green insect, three-eighths of an inch in length, triangular in form, 

 and shaped somewhat like a beechnut, but having the prothorax extending above 

 the head in two horn-like growths. They sometimes weaken the twigs of apple 

 by laying their eggs therein. The wounds so made are slow to heal, and on 

 young trees may be the cause of injury through the breaking off of the twigs. 

 No remedy is known except the cutting out of the eggs during the fall and 

 winter. 



XT^ 



Fig. 4. — Buffalo Tree-hopper, after Howard "Insect Life." 



Woolly louse of the apple (see insects affecting roots of the apple). 

 Apple twig-borer (see grape cane-borer). 



37 



