162 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



Upon consultation, it was decided to select for the theme of this 

 research the Woolly Aphis. Mr. H. W. Lohrenz, A. B., McPherson 

 College, and a graduate student at the University of Kansas, was 

 elected by the regents of the university to this fellowship. 



The purpose of this research is, after careful experimentation in 

 remedy and prevention, and investigation into the Ufe cycle of this 

 Aphis, to devise a practical means whereby nurserymen can properly 

 deal with this economic problem in such a way as to eliminate the 

 losses now attending the existence of this insect on nursery stock. 



The Fellow assumed this work June 15th last, too late to take up 

 the consideration of subterranean stages. In the following preliminary 

 account, therefore, he deals only with the first series of experiments on 

 summer conditions. 



It is worthy of note as showing the interest of nurserymen generally 

 in foundations of this nature that the Western Nurserymen's Associa- 

 tion, an organization of nurserymen of the Middle Western States, 

 passed resolutions commending the founder , of this fellowship for 

 the work he has instituted. 



THE WOOLLY APHIS, SCHIZONEURA LANIGERA 



By H. W. Lohrenz, Griesa Research Fellow, University of A'ansas 



Field Experiments 



First Se7'ies 



On July 25 twelve plats were marked off with stakes on a block 

 of apple seedlings. All of these were infested with Aphis. The next 

 day, July 25th, these were sprayed, with the exception of plat No. 10. 

 The solution used was a 15 per cent kerosene emulsion. A few inches 

 of soil was removed, and the bases of the trees and the ground about 

 them was thoroughly moistened. 



On August 4 plats Nos. 1, 2, 3, 5, 6, 8, 9, 10, and 11 were examined, 

 plats Nos. 4, 7, and 12 were not examined. One live Aphis was 

 found oh a root in plat No. 9. In plat No. 10, which had not been 

 sprayed, the Aphis were present in great numbers. The trees in the 

 sprayed plats seemed to be unaffected by the spray and looked as 

 healthy as any in the block. 



Plat No. 12 was examined on September 10. One of the sprayed 

 trees showed a few Aphis on the stem about four inches above the ground 

 and on the roots. It should be noted that the tops had not been 



