THE PEACH SAWFLY. 285 



hundred trees with "Scalecide." The results were satisfactory. 

 At Mr. Plant's orchard about seven hundred trees besides those 

 recorded in the tables were sprayed with "Scalecide" by the 

 owners, and the scale was kept well in check by the treatment. 

 A few words of caution should here be given for the benefit 

 of those who use the "soluble oils." The contents of the 

 original package should always be shaken or stirred so as to 

 become thoroughly uniform before any is mixed with water. 

 Directions to this effect are sent out by the manufacturers, and 

 in some cases accompany each package. These directions 

 should be followed. If such precautions are taken there will 

 probably be no injury to trees from the use of "soluble" oils. 

 If not thoroughly mixed, however, there is a slight separation 

 of the ingredients, and the oil from the top of the barrel or can 

 will not mix well with water and may cause injury to the tree. 

 A large tree sprayed with one of these preparations not prop- 

 erly stirred was injured by having all the leaf and blossom buds 

 killed on certain branches, which did not put out leaves until the 

 other branches were in full leaf. Adventitious buds appeared^ 

 and later the tree was uniform in foliage. Sometimes after long 

 standing it, is necessary to add a small quantity of water and 

 incorporate it with the oil before it will mix properly with the 

 larger amount of water used at the time of applying it to the 

 trees. 



THE PEACH SAWFLY. 



Pamphilius persicum MacGillivray. 



A NEW ENEMY OF THE PEACH ORCHARD. 



By B. H. Walden. 



The peach orchard of Barnes Brothers at Yalesville, Conn., 

 was visited at the request of the owners on June 14, 1906, to 

 look at some insects that were flying around among the trees. 

 Many trees in this section had been partially defoliated the 

 previous season, and while the insects were not observed by the 

 owners at that time, the occurrence of an unfamiliar insect in 

 numbers in the same locality the following season at once sug- 

 gested the cause. The insect proved to be a four-winged fly 

 about three-eighths of an inch long, the head and thorax black 

 with yellow markings, the legs and abdomen reddish brown or 



