New York State Museum Bulletin 



Entered as second-class matter November 27, 191S, at the post ofiSce at Albany, New York, 

 under the act of August 24, 1912 



Published monthly by The University of the State of New York 

 No. 186 ALBANY, N. Y. June i, 1916 



The University of the State of New Yorlc 



New York State Museum 



John M. Clarke, Director 

 Ephraim Porter Felt, State Entomologist 



31st REPORT OF THE STATE ENTOMOLOGIST 



1915 



Dr John M. Clarke, Director of the State Museum 



I have the honor to present herewith my report on the injurious 

 and other insects of the State of New York for the year ending 

 September 30, 19 15. 



The depredations of the apple tent caterpillar and the, forest tent 

 caterpillar, so evident the last two years, were continued the past 

 season, though severely infested localities were more restricted than 

 in earlier years. Popular warning notices were sent early to the 

 press. On Long Island in particular, a power spraying outfit was 

 used most successfully, though the large areas of oak infested made 

 it impossible to cover all satisfactorily with the equipment available. 



There was an unusual and entirely unexpected outbreak of the 

 cherry leaf beetle, Galerucella cavicollis Lee, a small, 

 reddish brown insect which appeared in imm.ense numbers in widely 

 scattered localities and caused considerable apprehension because 

 of its feeding upon cherry and peach tree foliage, though in most 

 instances the damage was comparatively insignificant. 



Oil injuries. The unfortunate developments following the appli- 

 cation of oils or oily compounds to the bark of deciduous trees has 

 again come to our attention, and in one locality was followed by 

 serious injury to forest trees. Experimental tests with this compound 

 upon small forest trees, under normal conditions, resulted in the 

 death, within six months, of six out of ten, while the remaining four 

 showed evidence of injury which may be followed by death another 

 season. Details of this work are given in the body of the report. 



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