220 Forty-fifth Report on tee State Museum. 



* 

 be found, but the stems bearing the buds were thickly and conspicu- 

 ously coated with a " honey-dew," which had been excreted by the 

 Psyllids. The presence of this honey-dew always serves, at this 

 season and onward, to disclose the attack of the (at this time) small 

 and almost hidden larvae 



This species of Psylla usually infests the pear. Its occurrence on 

 the apple has been noted by writers, but the above was the first time 

 that it had come under my observation. Its occurrence in the apple 

 orchard at Lincoln is the second instance. 



It has not been studied in this country, and most of our knowledge 

 of it is obtained from European authors. From its formidable attack 

 in pear orchards in the Budson river valley, it now claims the atten- 

 tion of our economic entomologists. [See Note B.] 



So far as we know its natural history, it may be best fought by 

 spraying with a kerosene emulsion early in the spring, before the hatch- 

 ing of the eggs, or just after the insect has emerged. Later, it will 

 probably be found to be enveloped in its copious excretion of honey- 

 dew that will make it difficult to reach by external applications. In 

 classification and general appearance, Psylla is near the plant-lice, and, 

 like them, takes its food by suction. ( Country Gentleman, of May 7, 

 1891.) 



Note A. — In the light of subsequent studies, it appears that my identification 

 with some doubt, of the moths received from Mr. Mothrop, can not be sus- 

 tained. Prof. M. V. Slingerland, of Cornell University, has fully worked out 

 the life-history of the eye-spotted bud-moth, and shown that the winged insect 

 comes abroad during the month of June and early July, and that there is but a 

 single brood — not two, as I indicated in a brief notice of the insect in my Seventh 

 Report, page 307. See Bulletin 50 , March 1893, of the Cornell University Agri- 

 cultural Experiment Station, for Professor Slingerland's elaborate study of the 

 insect. 



Note B. — The pear-tree Psylla, in consideration of its excessive multiplica- 

 tion and severe injuries in 1891, has, since the above was written, been given 

 the study that its economic importance demanded. In Bulletin 44, October, 

 1892, of the Cornell Experiment Station, Professor Slingerland has given us in 

 careful detail the life-history of this interesting insect, description and illustra- 

 tions of all its stages, and the satisfactory results of experiments made for its 

 control. My own observations upon it are in the MS. of my Ninth Report, 

 awaiting publication, 



