(27) 



(28) 



F. I. Frosheiser, D. L Stutevtlle, and others. 



1978. A compendium of alfalfa diseases. Amer- 

 ican Phytopathological Society, St. Paul, Minn., 

 65 p. 



R. R. Hill, Jr., D. K. Barnes, and others. 



1965. Effects of three cycles of selection for resist- 

 ance to common leafspot in alfalfa. Crop Sci- 

 ence 5:171-173. 



(29) K. W. Kreitlow, and L. R. Faulkner. 



1972. Diseases, ch. 23. In C. H. Hanson, ed., Alfalfa 

 science and technology. Agronomy 15:497-526. 

 American Society of Agronomy, Madison, Wis. 



(30) Gray, F. A., R. B. Hine, M. H. Schonhorst, and others. 



1973. A screening technique useful in selecting for 

 resistance in alfalfa to Phytophthora megasperma. 

 Phytopathology 63:1185-1188. 



(31) Griffin, G. D. 



1967. Evaluation of several techniques for screen- 

 ing alfalfa for resistance to Ditylenchus dipsaci 

 Plant Disease Reporter 51:651-654. 



(32) 



1968. the pathogenicity of Ditylenchus dipsaci to 

 alfalfa and the relationship of temperature to 

 plant infection and susceptibility. Phytopathol- 

 ogy 58:929-932. 



(33) 



(34) 



1 969. Effects of temperature on Meloidogyne hapla 



in alfalfa. Phytopathology 59:599-602. 

 and J. H. Elgin, Jr. 



1977. Penetration and development of Meloidogyne 

 hapla in resistant and susceptible alfalfa under 

 differing temperatures. Journal of Nematology 

 9:51-56. 



(35) Grundbacher, F. J. 



1962. Testing alfalfa seedlings for resistance to 

 the stem nematode Ditylenchus dipsaci (Kuhn) 

 Filipjev. Proceedings of the Helminthological 

 Society 29:152-158. 



(36) Hackerott, H. L, T. L. Harvey, E. L Sorensen, and 

 others. 



1958. Varietal differences in survival of alfalfa 

 seedlings infested with spotted alfalfa aphids. 

 Agronomy Journal 50:139-141. 

 (37) E. L Sorensen, T. L Harvey, and others. 



1963. Reactions of alfalfa varieties to pea aphids 

 in the field and greenhouse. Crop Science 3:298- 

 301. 



(38) Hanna, M. R., and E. J. Hawn. 



1964. Seedling inoculation studies with the alfalfa 

 stem nematode. Canadian Journal Plant Sci- 

 ence 45:357-363. 



(39) Hill, R. R., Jr., R. T. Sherwood, and J. W. Dudley. 



1963. Effect of recurrent phenotypic selection on 

 resistance of alfalfa to two physiological races of 

 Uromyces striatus medicaginis. Phytopathology 

 53:432-435. 



(40) Howe, W. L, and G. R. Pesho. 



1960a. Influence of plant age on the survival of 

 alfalfa varieties differing in resistance to the spot- 

 ted alfalfa aphid. Journal of Economic Entomol- 

 ogy 53:142-144. 



(41) and G. R. Pesho. 



1960b. Spotted alfalfa aphid resistance in mature 

 growth of alfalfa varieties. Journal of Economic 

 Entomology 53:234-238. 



(42) Howell, R. K., T. E. Devine, and C. H. Hanson. 



1971. Resistance of selected alfalfa strains to 

 ozone. Crop Science 11:114-115. 



(43) Hunt, O. J., L R. Faulkner, and R. N. Peaden. 



1972. Breeding for nematode resistance, ch. 16. In 

 C. H. Hanson, ed., Alfalfa science and technology. 

 Agronomy 15:355-370. American Society Agron- 

 omy, Madison, Wis. 



(44) R. N. Peaden, G. D. Griffin, and others. 



1969. Development of resistance to root-knot 

 nematode (Meloidogyne hapla Chitwood) in alfalfa 

 {Medicago sativa L). Crop Science 9:624-627. 



(45) Jarvis, J. L, and W. R. Kehr. 



1966. Population counts vs. nymphs per gram of 

 plant material in determining degree of alfalfa 

 resistance to the potato leafhopper. Journal of 

 Economic Entomology 59:427-430. 



(46) Kehr, W. R., F. I. Frosheiser, R. D. Wilcoxson, and 

 others. 



1972. Breeding for disease resistance, ch. 15. In 

 C. H. Hanson, ed., Alfalfa science and technology. 

 Agronomy 15:335-354. American Society Agron- 

 omy, Madison, Wis. 



(47) and G. R. Manglitz. 



1 976. Performance of certified seed lots of Dawson 

 alfalfa. Nebraska Agricultural Experiment Sta- 

 tion, Research Bulletin No. 277. 



(48) R. L Ogden, and S. D. Kindler. 



1970. Diallel analyses of potato leafhopper injury 

 to alfalfa. Crop Science 10:584-586. 



R. L Ogden, and S. D. Kindler. 



(49) 



1975. Management of four alfalfa varieties to 

 control damage from potato leafhopper. Ne- 

 braska Agricultural Experiment Station, Research 

 Bulletin No. 275. 



(50) Kernkamp, M. F., and Glen Hemerick. 



1952. A "deep-freeze" method of maintaining viru- 

 lent inoculum of the alfalfa wilt bacterium, Coryne- 

 bacterium insidiosum. Phytopathology 42:13. 



(51) Kindler, S. D., and W. R. Kehr. 



1970. Field tests of alfalfa selected for resistance 

 to potato leafhopper in the greenhouse. Journal 

 of Economic Entomology 63:1464-1467. 



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