INSECTS AFFECTINi; PARK AXU WOODLAND TREES 33 1 



attention to the very beautiful luiropean H a b r o 1 e p i s d a I m a n n i 

 Wcstw., an accidental introduction into this countr\, and states that he 

 received a large series of this parasite from Mr A. H. Kirkland who had 

 reared it from this insect which latter has become common on the oaks 

 throughout the Middlesex Fells. L)r Howard is of the opinion that the 

 parasite was probably brought over with the original importation and that 

 this scale insect has become thoroughly established in that section. This 

 beautiful parasite is illustrated at figure 63. 



Mr R. H. Newstead of England states that he has seen the blue tit 

 and the long tailed tit feeding on this and certain other scale insects. It 

 would seem very probable that some of our native birds would feed on this 

 insect to some extent, and it is likely that some of our common predaceous 

 insects may learn to subsist on this pest. 



Remedial measures. The experiments of Dr C. L. Marlatt show that 



the recently hatched young can be killed with a kerosene emulsion prepared 



according to the standard formula and diluted with 13 parts of water. This 



application should be made at the time the young are most ^bundant, 



which can be easily determined by a little observation about the middle 



of May or later. 



Bibliography 



1880 Comstock, J. H. U. S. Dep't Agric. Rep't, p. 330 



1890 Packard, A. S. U. S. Ent. Com. 5th Kc\>'{, ji. 102 



1897 Lowe, V. H. N. Y. Agric Exp. Sta. Bui. 136, p. 586-87 



1902 Felt, E. P. State Ent. 17th Rep't, X. Y. State Mus. Bui. 53, p. 746-48 



Hickory gall aphid 



PJiylloxcra carvaccaiilis Fitch 



Bulletlike, hollow green galls of a leathery texture, occur on hickory shoots in June, 

 turning black the latter part of the month or early in July, and somewhat resemble the 

 black knot of plum. 



These peculiar growths on the terminal limbs of hickory are brought 

 to the writer's attention almost annually by the receipt of more or less 

 deformed twigs with incjuiries as to the cause of the trouble. 



