

THE PEA APHIS WITH RELATION TO FOEAGE CROPS. 65 



1911a. Essig, E. 0. Host index to California plant lice ( Aphididae) . In Pomona 

 Col. Jour. Ent., v. 3, no. 2, p. 457-479, May. 



Compiled list of hosts for Macrosiphum ulmariae includes sweet pea (Lathyrus odoratus), 

 wild pea {Lathyrus sp.), pea (Pisum sativum), nettle ( Urtica Jiolosericea) , vetch ( Vicia sativa). 



1911b. Essig, E. O. Annual Report of the work of the County Horticultural Com- 

 missioner for the year ending June 30, 1911. Ventura Co. Hort. Com., 

 Bui. 2, 60 p., 49 fig. 

 Page 48. Figures Macrosiphum destructor and mentions it as a pest of peas and vetches. 



1911. Gossard, H. A. Fall manual of practice in economic zoology. Ohio Agr. 

 Expt. Sta., Bui. 233, p. 53-164+vii, 2 fig., 11 pi., Nov. 



Page 78. Advocates late cutting or pasturing of clover, especially fixs1>year clover, as a 

 remedy against Macrosiphum pisi. 



1911. Gibson, Arthur. Reports on insects of the year. Division No. 1, Ottawa 

 District. In 41st Ann. Rpt. Ent. Soc. Ontario f. 1910, p. 11-16. 



Page 16. Occurrence on field and sweet peas but not especially injurious. Several natural 

 enemies noted. 



1911. Gillette, C. P. Plant louse notes, family Aphididae. In Jour. Econ. Ent., 

 v. 4, no. 4, p. 381-385, pi. 16, Aug. 



Page 3S3. Reports Macrosiphum pisi from Albany, N. Y., on red clover, and from Colorado 

 on garden and sweet pea, alfalfa, and sweet clover ( Melilotus alba). 



1911. Gossard, H. A. Entomological review of the year 1910. In Jour. Econ. Ent., 

 v. 4, no. 2, p. 203-209, April. 



Page 208. Reports Macrosiphum pisi abundant in northwestern Ohio, some fields of clover 

 dying out after the clover was cut. Droughty conditions probably responsible for unusual 

 abundance of the aphid. 



1911a. Hewitt, C. Gordon. Report of the entomologist. In Canada Expt. Farms 

 Repts. f. 1910, p. 223-250, 3 pi. 

 Page 243. Nectarophora pisi was destructive in Quebec and Ontario from July to September. 



1911b. Hewitt, C. Gordon. Report of the Dominion Entomologist. In Canada 



Expt. Farms Rpts. f. 1911, p. 202-235, 3 fig., pi. 5-7. 



Page 230. Macrosiphum destructor was present in most parts of Ontario and appeared to 

 check growth of plants. 



1911. Patch, Edith M. Macrosiphum destructor and Macrosiphum solanifolii. Maine 

 Agr. Expt. Sta., Bui. 190, p. 81-92, fig. 59-72, June. 



Discussion of characters of these two species, their differences, and insectary hoslxplant 

 tests. 



1911. Ruggles, A. G., and Stakman, E. C. Orchard and garden spraying. Univ. 

 Minn. Agr. Expt. Sta., Bui. 121, 32 p., March. 

 Page 30. Remedies for sweet-pea plant louse. 



1911. Williams, T. A. The Aphididse of Nebraska. In University [Nebraska] 

 Studies, v. 10, no. 2, f. 1910, p. 85-175, April. 

 Page 84. Reported for clover in Nebraska. 



1912a. Essig, E. O. Plant lice. In Proc. of 40th Fruit Growers Conv. of the State 

 of Cal. f. 1911, p. 11-24, 3 fig. 

 Page 15. Macrosiphum destructor included as one of the injurious aphidids of California. 



1912b. Essig, E. O. Plant lice affecting citrus trees. Pt. I. Mo. Bui. Cal. State 

 Com. Hort., v. 1, no. 4, p. 115-133, fig. 40-45, March. 



Page 126-127. Compares Macrosiphum destructor with Macrosiphum rosae and Macro- 

 siphum citrifolii. 



