158 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



the addition of 4 pounds of lime is not always safe for peach spraying. 



4. Early applications of lead arsenate upon peach are less likely to 

 cause injurv than those of the same formula applied later. 



5. Lead arsenate used upon peach should be practically free from 

 uncombined water soluble arsenic and should contain a maximum 

 amount of arsenious oxide. 



Spraying Suggestions 



The following is a scheme proposed for peach spraying for the 

 spring of 1909 : 



First Spray. — Immediately following the time the "husks" have 

 dropped from the small peaches, whjch will be when Elbertas usually 

 measure from yz to 14 inch in diameter. Use one pound of guaran- 

 teed arsenate of lead, 2 pounds quick lime to each 50 gallons of water, 

 applying the spray as a rather fine mist spray, using no more material 

 than necessary to thoroughly coat the surface of every peach upon 

 the tree. The pubescence over the peach will hold the spray and upon 

 drying will leave the poison evenly distributed. This spray will be at 

 about the time the first food punctures are being made. 



Second Spray. — About ten days or two weeks following the first 

 application repeat the spray, using the same formula applied as a 

 mist and with the same thoroughness as before. This spraying will be 

 done when numerous punctures, both food and egg, are being made. 



Third Spray. — About ten days following the second give a third ap- 

 plication in the same manner as before. At this time Elbertas will 

 ordinarily measure 1 to 1^ inches in diameter. 



These times for application being based upon development of the 

 peach and with no reference to specific calendar dates should be ap- 

 plicable as guides for the proper timing of sprays for peach growers 

 living in any section. 



The treatments, it will be seen, are suggested at a time early in the 

 development of the peach, at the time when the first and when the 

 hiajority of the food punctures are being made. The experiments this 

 year did not indicate that arsenical sprays applied to peaches previous 

 to the dropping of the dried calyces gave results of sufficient value to 

 justify them. On the other hand, the destruction of the hibernating 

 beetles early prevented e^g deposition and intercepted the develop- 

 ment of the generation emerging later. Of the three sprays recom- 

 mended, the first and second are the most important. Peach trees 

 appear to be more susceptible to injury when sprayed later than early. 

 The time when the most adult beetles may be destroyed, fortunately for 



