00785cam a2200241 4500 agr67000315 DLC 20260227111027.0 700507s1967 dcua 000 0 eng c agr67000315 U.S. Nat'l Agr. Libr. DLC DLC A420 R31 no. 120 Nielson, Mervin William. Procedures for screening and testing alfalfa for resistance to the alfalfa seed chalcid, by M. W. Nielson. [Washington] 1967. 10 p. illus. 26 cm. United States. Agricultural Research Service. ARS33- 120 Caption title. Alfalfa Disease and pest resistance. Bruchophagus roddi. Alfalfa. Bruchophagus roddi. 12257 12257