New York Agricultural Experiment Station. 577 



Preventive measures consist chiefly in refusing to handle in- 

 fested stock and in keeping the nursery free from old infested 

 apple trees. 



Remedial measures con.sist in treating the infested tree with 

 some insecticidal wash, such as strong soap suds or kerosene 

 emulsion for the lice above ground, and applying these washes 

 to the roots or keeping the soil around the crown of the roots 

 wet with water until the lice have succumbed. 



Partial Bibliographical List.* 



♦ An asterisk denotes that the item was taken from the "Bibliography of the More Import- 

 ant Contributions to American Economic Entomology," by Samuel Henshaw; published by 

 the U. S. Dept. Agr. Div. of Entomology. 



J.827. *Adams, John. Result of an experiment to destroy Aphis 

 lanigera, or American blight on fruit trees. Loudon's 

 Gard. Mag., 1827, vol. II, p. 49. 



spirits of turpentine effective ajjainst Aplds \^Sch.izoneura] lanigera. 



*Dann, John. An effectual mode of destroying Aphis 

 lanigera, or American blight, on fruit trees. Loudon's 

 Gard. Mag., vol. II, p. 165. 



Formula for the destruction of Aphii [—Schizoneura] lanigera. 



185G. Fjtch, Dr. Asa. First Report on the Noxious, Beneficial 

 and Other Insects of the State of New York (in one 

 volume with second report) pp. 5-11. Brief account of 

 his discovery of this insect on some young apple trees, 

 Oct. 29, 1849; also history of the insect up to that time, 

 together with brief account of injuries to roots and de- 

 tailed description of " young larvsB " and " matured 

 winged individuals." Strong soap suds and ashes given 

 as remedies. Popular name given as the apple-root 

 blight, and the scientific name. Pemphigus Pyri, witli 

 Erisoma Pyri Fitch, and Pemphigus Americanus Wal- 

 ker, as synonyms 



1865. *Vkrrill, Addison D. The woolly apple-tree blight — 

 Eriosoma lanigera Harris. Prac. Ent., 25 December, 

 1865, vol. I, p. 21. 



OccurreuL'e of wiuged females of E. [^ Schiznneura'] lanigera; its power 

 of endurii;g cold. 



37 



