70 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
CONTROL. 
As many of the larve eat their way through the fleshy hull cover- 
ing of the walnut, it is probable that a thorough spraying with 
arsenate of lead in the month of August would greatly reduce the 
infestation. This treatment would apparently be as effective in 
destroying larve from eggs placed promiscuously over the foliage 
and nuts as in the case of the apple. From the fact that many of 
the larve gain entrance to the walnut after the hull has parted at 
the tip, the poison would, of course, not be effective against these. 
The infestation can, no doubt, be greatly reduced by maintaining 
the packing shed and drying grounds some distance from the walnut 
grove. 
It is the practice of many pear growers to save all windfalls in 
the orchard and culls from the packing shed. These pears are either 
stored in large trays, stacked in the shade, or else the pears are 
covered with straw in layers on the ground. As a rule, the culls 
from the packing ground are nearly all infested with immature 
larve of the codling moth, which reach their full development and 
produce moths during the ripening period of the walnuts. This, 
in most cases, is the source of infestation of walnut groves found 
to be most seriously troubled with the codling moth. 
O 
