The corn root aphid and methods of controlling it.
Davis, John J. 1885-1965
The corn root aphid and methods of controlling it. [Rev. May 1949 by C.M. Packard. - Washington, U. S. Govt. Print. Off., 1949] - 7 p. illus. 24 cm. - Farmers' bulletin, no. 891 . - Farmers' bulletin (United States. Department of Agriculture) no. 891. .
Contribution from Bureau of Entomology and Plant Quarantine.
agr49000586
Corn root-aphis.
S21 / .A6 rev. no. 891b
The corn root aphid and methods of controlling it. [Rev. May 1949 by C.M. Packard. - Washington, U. S. Govt. Print. Off., 1949] - 7 p. illus. 24 cm. - Farmers' bulletin, no. 891 . - Farmers' bulletin (United States. Department of Agriculture) no. 891. .
Contribution from Bureau of Entomology and Plant Quarantine.
agr49000586
Corn root-aphis.
S21 / .A6 rev. no. 891b