THE PEACH SAWFLY. ' 295 



4,000-5,000 trees between June 24th and July loth. The owners 

 intended to spray more, but during the first week in July had to 

 suspend operations to wait for a shipment of lead arsenate. The 

 arsenate of lead purchased was manufactured by the Powers- 

 Weightman-Rosengarten Company of Philadelphia,* and was 

 applied at the rate of 2j^ to 3 lbs. in fifty gallons of water. 



The larvae, like many sawfly larvae, were very rejadily killed 

 by the poison, and probably used at one-half this strength (one 

 and one-half pounds in fifty gallons) would have been effective. 

 Mr. Barnes was unable to be in the orchards much of the time 

 to see that the men thoroughly covered the foliage, and the 

 stronger solution was used partly for this reason. Plate VI, a., 

 shows the sprayers at work in this orchard. 



Owing to the peculiar season, the young larvae probably 

 appeared more irregularly than they would in an average season. 

 During the first ten days of July many trees showed considerable 

 of the insect work, and many of the larvae became full-grown, 

 but there were still many partly grown larvae present on the same 

 trees which might add much to the damage already done, and the 

 spraying was continued until the 9th of July. The treatment 

 was entirely successful, the work of the insect being checked' 

 wherever the trees were sprayed. From my notes of July 3d 

 regarding trees sprayed about the 24th of June : — "Found many 

 dead larvae in the rolled leaves on the sprayed trees, and the 

 foliage shows a marked difference from that on trees not 

 sprayed." 



The writer examined many of the sprayed trees for two or 

 three weeks following the operation, and in no case was any 

 injury to the foliage seen. Mr. Barnes watched throughout the 

 season, a nimiber of trees which had received an extra heavy 

 coating of arsenate of lead, and though the 'mixture showed on 

 the foliage until the leaves fell, no injury was observed. 



Description. 



Egg. The eggs are pearly white in color, 1.64 mm. (average 

 of six) in length, and .6 mm. (average of four) wide, sides 

 nearly straight and of uniform width, the ends regularly and 

 broadly rounded. Occasionally an &gg is very slightly curved. 



♦Analysis, Conn. Agric Exper. Stat. Bull. 157, p. s, 1907. (See page 323 

 of this report.) 



