pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-4-1-3 Articles Resistance of Wild Species of Arachis to the Twospotted Spider Mite, Tetranychus Urticae1,2,3 D. R. Johnson , J. C. Wynne , and W. V. Campbell 4 Formerly graduate assistant (now Visiting Assistant Professor, Dept. of Entomology and Economic Zoology, Clemson University, Clemson, S. C. 29631), Assistant Professor of Crop Science, and Professor of Entomology, N. C. State University, Raleigh, respectively

1Acarina: Tetranychidae.

2Portion of a dissertation submitted for partial fulfillment of the Ph.D. degree in Entomology at North Carolina State University.

3Paper No. 5184 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh. Received for publication _____.

 1 1977 1 1977 4 1 9 11 American Peanut Research and Education Society 1977 American Peanut Research and Education Society Abstract

Wild species of Arachis representing all seven sections of the genus were screened in the greenhouse for resistance to the twospotted spider mite, Tetranychus urticae Koch. Most species of the section RHIZOMATOSAE were found to be highly resistant to the mite. Plant introductions 338296, 338317, 262840, 262827 and several other members of the section RHIZOMATOSAE were virtually mite free throughout the tests.

PI 276203 from section EXTRANERVOSAE, PI 262142 from section ERECTOIDES and PI 331194 from section ARACHIS also had relatively low damage ratings in this study. Section Arachis is the only section with resistance to the mite that will cross readily with cultivated peanuts, Arachis hypogaea L. Thus the utilization of germplasm resistant to the mite from the wild species will require complicated and difficult breeding procedures.