NEW YORK STATE MUSEUM 0$ 



trees, though Mr Plunkett stated that he was unable to find anything 

 of the kind in the orchard coming under his observation. An early 

 and thorough application of arsenate of lead would doubtless check 

 the pest before serious injury was caused. 



Apple and thorn skeletonizer (Hemerophila pariana 

 Clerck). This European insect had become well established in 

 Westchester and Rockland counties in 19 17 and has continued to 

 maintain itself in fair to rather large numbers, and in 1921 attracted 

 considerable notice because of its unusual abundance. 



The damage by this pest has been very severe, according to 

 G. M. Codding of the F. A. Bartlett Tree Expert Co., in the southern 

 part of Westchester county. This territory included New Rochelle, 

 through Quaker Ridge and White Plains where literally hundreds 

 of trees have been entirely defoliated and many others severely 

 affected. There has been damage along the Hudson river as far 

 north as Ossining; north of Mamaroneck, and also in Tiuckahoe, 

 entire orchards have been stripped. Mr Codding, writing under date 

 of October 3d, stated that he has observed larvae working since 

 early in the season. Up to the present, he adds, the outbreak appears 

 to have been generally severe throughout the southern part of West- 

 chester county, while last year, with the exception of Dobbs Ferry 

 and Hastings, there was little real injury. F. A. Bartlett observed 

 serious injury in Mount Kisco and vicinity and particularly in adja- 

 cent Connecticut areas. 



J. G. Curtis, manager of the Westchester farm bureau, stated 

 that there was comparatively little injury by the thorn skeletonizer 

 in the Tarrytown section as compared with 2 years ago. He is of 

 the opinion that it is being controlled by more thorough spraying. 

 He adds that the work of this pest was noticeable in a few orchards 

 and on roadside trees in the vicinity of Rye and Port Chester. 



P. L. Huested of Blauvelt states that the pest is somewhat more 

 abundant than in previous years and that he is certain its range has 

 been greatly extended. He has noted the insect from Nyack to 

 Chester, a distance of about 45 miles. 



The developments of the past season clearly established the 

 occurrence of three and possibly of four generations in one season, 

 in the opinion of Henry Bird who has been following the develop- 

 ments of the insect rather closely. 



This pest skeletonizes apple leaves in much the same way as the 

 well-known canker worms, except that the latter more generally 

 devour all the tissues of nearly every leaf, whereas the small green- 



