NEW YORK STATE MUSEUM 6/" 



tain illustrations of the various stages and of the more characteristic 

 types of injury. 



There is no question but what thorough and timely spraying with 

 a poison such as arsenate of lead will destroy the caterpillars and, 

 owing to their feeding almost entirely upon the upper surface of 

 the leaves, a general application to all trees on which the pest can 

 subsist would mean its early control and practical elimination so far 

 as material damage is concerned. Owing to the development of 

 several broods each season, it is perhaps unnecessary to state that 

 it is by all means advisable to destroy the earlier generations. The 

 usual spraying schedule advocated for commercial orchards ought 

 to prevent serious injury by this insect, excepting possibly in 

 restricted areas where the skeletonizer might be excessively 

 abundant. 



Dock false worm (Ametastegia glabrata Fall.). 

 Small numbers of the greenish larva of this sawfly were found in 

 October 191 5, boring cylindrical holes with a diameter of about 2 

 mm, straight into the sides of Baldwin apples in the orchard of J. 

 A. Talbot, Spencerport. The percentage of fruit affected in this 

 manner was infinitesimal and the damage, so far as observed, was 

 limited to one portion of the orchard where a small amount of poly- 

 gonum or dock was growing at the base of the trees or in nearby 

 uncultivated areas. The insect in this particular case was of no 

 great importance though the injury is worthy of record in connec- 

 tion with its identification. This species has been noticed in some 

 detail by E. J. Newcomer,^ and an illustration of recent work by 

 the larva is given on plate 11 of Museum Bulletin 186. 



Tree crickets (Oecanthus sp.) and canker. A striking 

 instance of the connection between tree crickets and apple canker 

 was brought to our attention by H. W. Fitch, assistant farm bureau 

 manager of Albany county. A number of young apple trees on the 

 farm of L. L. Jones, Feura Bush, were examined April 22, 1920, 

 and considerable injury was found on 15-year old apple trees 

 resulting from oviposition by this insect and the frequently accom- 

 panying inoculation by canker spores. A few of the trees were so 

 badly affected that many of the characteristic oval areas on the 

 bark were to be found within 3 inches of one another. This injury 

 is most easily recognized by the irregular, circular or oval dead area, 

 generally with a minute circular puncture about one-sixteenth of 

 an inch in diameter, near the center. These areas vary in diameter 



^ 1916 U. S. Dep't Agric, Bui. 265. 

 3 



