Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:327-329 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Relationships of the Clover Root Curculio, Fusarium Wilt, and Bacterial Wilt in Alfalfa1

R. R. Hill, Jr., R. C. Newton, K. E. Zeiders and J. H. Elgin, Jr.2

Alfalfa, Medicago saliva L., plants were exposed to larvae of the clover root curculio, Sitona hispidula (F.), the Fusarium wilt fungus, Fusarium oxysporum Schlecht. f. sp. medicaginis (Weimer) Snyd. & Hans., and the bacterial wilt organism, Corynebacterium insidiosum (McCull.) H. L. Jens., in factorial combinations in two greenhouse experiments. S. hispidula and F. oxysporum significantly reduced the growth of alfalfa plants. A higher level of Fusarium wilt was observed when S. hispidula was present than when it was absent. C. insidiosum did not reduce growth of alfalfa. No relation between effects of S. hispidula and C. insidiosum was detected.

Key Words: Root insects • Root rot • Sitona hispidula (F.) (Coleopteraicurculionidae)

1 Contribution no. 225 of the U. S. Regional Pasture Research Laboratory, University Park, Pa. 16802, in cooperation with the 12 Northeastern States. A joint contribution of the Crops and Entomology Research Divisions, Agricultural Research Service, United States Department of Agriculture.

2 Research Agronomist, Research Entomologist, Plant Pathologist, and Agronomist Research Assistant, U. S. Regional Pasture Research Laboratory, University Park, Pa. 16802.

Received for publication October 3, 1968.




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