INSECTS INJURIOUS TO THE APPLE AND PEAR 629 



will cause it to adhere as well as arsenate of lead and there will be 

 little danger of burning with a good quality of Paris green. One- 

 third pound per barrel of Paris green, 2 or 3 pounds of arsenate of 

 lead, or 1 quart of stock solution of arsenite of lime are the proper 

 strengths for general use. The first spraying for the codling moth 

 should be given just after the blossoms have fallen and before 

 the sepals of the calyx close, the object being to place the poison 

 in the calyx cavity so that the little larva will be poisoned when it 

 enters and feeds in the calyx a few weeks later. In general this 



FIG. 486. Full grown larva of the codling moth enlarged about three 

 times. (After Slingerland.) 



spraying should be given within a week or ten days after two- 

 thirds of the petals have dropped, but the time will depend upon 

 the variety and the season. 



In the West great emphasis has recently been placed upon 

 using a coarse spray with a high pressure, 100 to 250 pounds, 

 which will drive the spray through the bases of the stamens 

 into the lower calyx cavity, and though excellent result are 

 undoubtedly secured in this way, experiments in the East 

 indicate that a mist spray is equally effective if thoroughly 

 applied, whether the lower calyx cavity is reached or not. 

 There is no question, however, of the importance of maintaining 



