June, ’18] 
DAVIDSON: ALTERNATION OF APHID HOSTS 
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The Green Peach Aphis {Myzus persicos Sulzer) 
1908. C. P. Taylor. Life-History Notes and Control of the Green Peach Aphis, 
Myzus persicce. Journ. Econ. Ent. I, 2. 
The Currant Aphis {Myzus ribis Linn.) 
1917. C. P. Gillette & L. C. Bragg. The Migratory Habits of Myzus ribis Linn. 
Journ. Econ. Ent. X, 3. 
The Rosy Apple Aphis {Aphis malifolice Fitch) 
1915. W. A. Ross. Orchard Insects. Ent. Soc., Ontario, 45th Ann. Rep. 
1916. A. C, Baker & W. F. Turner. Rosy Apple Aphis. Journ. Agric. Res. VII, 
7. 
The Black Cherry Aphis {Myzus cerasi Linn.) 
1917. W. A. Ross. The Secondary Host of Myzus cerasi. Can. Ent. XLIX, 12. 
1918. W. A. Ross. The Black Cherry Aphis. Agric. Gazette of Canada V, 1. 
The Grape Vine Aphis {Macrosiphum illinoisense Shimer) 
1917. A. C. Baker. Life-History of Macrosiphum illinoisense , the Grape Vine 
Aphis. Journ. Agric. Res. XI, 3. 
Miscellaneous 
1908. C. P. Gillette. Notes and descriptions of Some Orchard Plant Lice of 
the Family Aphididae. Journ. Econ. Ent. I, 5. 
1910. J. J. Davis. A List of the Aphididae of Illinois, with Notes on Some of the 
Species. Journ. Econ. Ent. Ill, 6. 
1911. E. O. Essig. Host Index to California Plant Lice, Aphididae. Pomona Coll. 
Journ. Ent. Ill, 2. 
1914. E. Patch. Currant and Gooseberry Aphids in Maine. Me. Agric. Exp. 
Sta. Bull. 225. 
1914. E. Patch. Maine Aphids of the Rose Family. Me. Agric. Exp. Sta. Bull. 
233. 
1915. C. P. Gillette and L. C. Bragg. Notes on Some Colorado Aphids Having 
Alternate Food Plants. Journ. Econ. Ent. VIII, 1. 
1917. W. M. Davidson. The Cat-tail Rush, Typha latifolia, as a Summer Host 
of Injurious Insects. Month. Bull. Cal. Hort. Comm. VI, 2. 
1917. C. P. Gillette. Habits of Some Common Plant-Lice. Month. Bull. Cal. 
Hort. Comm. VI, 2. 
1917. A. L. Quaintance and A. C. Baker. Aphids Injurious to Orchard Fruits, 
Currant, Gooseberry and Grape. U. S. D. A. Bur. Ent. Farmer’s Bulletin 804. 
1917. W. M. Davidson. The Reddish-Brown Plum Aphis {Rhopalosiphum nym- 
phece Linn. Journ. Econ. Ent. X, 3. 
President G. P. Weldon: Is there any discussion of this paper? 
G. P. Gray: The weeds which were mentioned in this paper as 
hosts of the aphids, brings up the question of the relation of weed con¬ 
trol to insect control. 
G. P. Weldon: Is Amaranthus a summer host plant of the rosy 
apple aphis? Bremner has reported in the Monthly Bulletin of the 
