New York Agricultural Experiment Station. 441 



prevent serious interference with their business. These restric- 

 tions to the trade have created a demand for nursery stock in- 

 spection which is far too great for a station entomologist to meet 

 properly without aid if he expects to carry on his regular work. 

 We found the demands for this kind of work so heavy during the 

 past season that, in order to prevent a too serious interference 

 with other duties, it was necessary to restrict our inspection for 

 the most part to Ontario County alone. As yet no provision has 

 been made either by State or federal law to meet this urgent de- 

 mand of a highly important industry. 



Varieties of Trees, Shrubs and Vines Examined. 

 It is not necessary to give a list here of the varieties of trees, 

 shrubs and vines examined. It is safe to say that practically all 

 the varieties of plants grown as nursery stock in Western New 

 York, both in the field and under glass, were examined on differ- 

 ent occasions. By far the greater part of the stock Inspected, 

 however, consisted of the various varieties of fruit trees. 



Varieties of Trees Most Commonly Infested. 

 These were the apple, peach and pear trees. The apple and 

 pear trees were most commonly infested with the woolly aphis, 

 and this pest was most often found on the Ben Davis and Yellow 

 Transparent apples and upon the standard pears. In most cases 

 of infested pear trees, the blocks were next to blocks of infested 

 apples, the indications being that the insects had come from 

 the apples to the pears. The peach trees were infested with the 

 peach-tree borer. 



Species of Insects Included in this Report. 



Only the more important species which are readily transferred 

 on nursery stock are included in this report. No account is 

 taken of the large number of species which attack the stock dur- 

 ing the growing season but which do not remain on the trees 

 after the leaves are taken off and hence are not readily scattered 

 over the country by means of nursery stock. 



For convenience the species herein discussed may be grouped 

 under four heads as follows: 



