Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 18:1008-1011 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Lesion Nematode Resistance in Peanuts1

O. D. Smith, T. E. Boswell and W. H. Thames2

Six peanut (Arachis hypogaea L.) introductions and two commercial cultivars (‘Starr’ and ‘Spancross’) were evaluated for lesion nematode (Pratylenchus brachyurus (Godfrey) Fefip & Sch. Stek) resistance under field conditions. Multiple harvests were used to compensate for maturity differences among peanut lines. Nematicide treatments were included to aid in evaluating the level of resistance.

Shells of the peanut introductions PI 295233 and PI 290606 had significantly less pod discoloration and fewer nematodes from shell extractions than the commercial Spanish cultivars. Nematode extractions from root tissue supported the results from the shell samples. Three additional PI's showed lesser degrees of resistance.

Subsequent comparisons among Starr, ‘Florunner’, PI 295233 and PI 290606 verified the results. Significantly more (P = 0.00036) nematodes were extracted from shell tissue of Starr and Florunner than of the other two en. tries. More nematodes (P=0.00003) were extracted from root samples of Starr than of the other three entries. The possibility that resistance is controlled separately in shell and root tissue is suggested.

Key Words: Arachis hypogaea L. Pratylerchus brachyurus • Host plant resistance • Groundnuts • Correlations • Breeding • Shells • Roots • Nematicide

1 A contribution of the Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX.

2 Associate professor, Dep. of Soil & Crop Sciences, Texas A&M Univ., College Station, TX 77843; associate professor Texas A&M Univ. Plant Disease Res. Stn., Yoakum, TX 77955; and professor, Dep. of Plant Science, Texas A&M Univ., College Station, TX 77843, respectively.

Received for publication December 12, 1977.




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