THE PEA APHIS WITH RELATION TO FORAGE CROPS. 
65 
1911a. EssiG, E. O. 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 (Lathyrm sp.), pea (Pimm sativum), nettle ( Urtica holosericea) , vetc-h ( Vicia saliva). 
1911b. EssiG, E. 0. Annual Report of the work of the County Horticultural Com- 
missioner for the year ending June 30, 1911. Ventura Co. Hort. Com., 
Bui. 2, ()0 p., 49 fig. 
Page 48. Figures Macrosiphum dcsfrmtor and mentions it as a pest of peas and vetches. 
1911. (iossARD, 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 first-year clover, as a 
remedy against Macrosiphum pisi. 
1911. Gibson, Arthur. Reports on in.sects of the year. Di\-ision 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 especialh^ injurious. Several natural 
enemies noted. 
1911. GiLLBTTE, C. P. Plant louse notes, family Aphididae. In Jour. Econ. Ent., 
V. 4, no. 4, p. 381-385, pi. 16, Aug. 
Page 383. 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 Siud Macrosiphiun 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 host-plant 
tests. 
1911. RuGGLES, A. G., AND Stakman, E. C. Orchard and garden sprajdng. Univ. 
Minn. Agr. Expt. Sta., Bui. 121, 32 p., March. 
Page 30. Remedies for sweet-pea plant louse. 
1911. Williams, T. A. The Apliidida3 of Nebraska. In University [Nebraska] 
Studies, V. 10, no. 2, f. 1910, p. 85-175, April. 
I'age 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. 0. Plant lice affecting citrus trees. Pt. 1. 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 rosac and Macro- 
siphum citrifolii. 
