Keport of the Entomologists. 571 



tion this insect, are Dr. Asa Fitch, who published a general ac- 

 count of it in 1856, in his first report; Dr. Riley, who discusses it 

 in his First Missouri Eeport, published in 1869, and Dr. Thomas, 

 who published an exhaustive account in his Illinois Report for 

 1878. In addition to these are numerous shorter accounts, which 

 have been published from time to time. Probably few of our 

 injurious species of insects have been discussed in the press and 

 in the various bulletins and reports of the experiment stations 

 more than this one. In spite of this fact, however, the woolly 

 aphis of the apple is still far from being controlled in our nur- 

 series and orchards. 



Distribution. 



In general it may be said that this species of woolly aphis is 

 found wherever apples are grown. In the United States it is 

 well known from Maine to California. In Canada it is also a 

 serious pest. 



Means of distribution. — Distribution may be accomplished in an 

 orchard by means of the winged viviparous females which can 

 fly from place to place. The distribution from one section of the 

 country to another, however, is most frequently accomplished 

 by means of nursery stock. It is surprising how many infested 

 trees are shipped from our nurseries annually. Usually it is 

 not diflScult to detect the lice when on the roots or trunks of the 

 trees, and hence there seems to be but little excuse for allowing 

 the infested trees to go out of the packing yards without first 



being treated. 



Importance in New York. 



This insect is of especial importance in this state, as it is found 

 in almost every section of the state where apple trees are grown. 

 This is especially true with regard to the nurseries. As New York 

 is one of the leading apple and nursery stock producing states, 

 the importance of this insect as a pest in this state is at once 

 apparent. On both light and heavy soils the insect seems to 

 thrive and to increase with great rapidity. We have received 

 letters from various sections of the state indicating that the 

 woolly aphis is attracting a good deal of attention, especially 

 among nurserymen and those who are planting young orchards, 

 and that it is proving a diflBcult insect to control. 



