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Title: LABORATORY AND FIELD EVALUATIONS OF PEANUT CULTIVARS FOR RESISTANCE TO DIABROTICA UNDECIMPUNCTATA HOWARDI BARBER

Author
item PETKA, W - TIDEWATER AG RES & EXT CT
item HERBERT, JR, D - TIDEWATER AG RES & EXT CT
item COFFELT, TERRY

Submitted to: American Peanut Research and Education Society Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 7/11/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The southern corn rootworm (Diabrotica undecimpunctata howardi Barber) is the primary soil insect pest to peanut (Arachis hypogaea L.) in Virginia and North Carolina. The newer cultivars, which are planted on the majority of acreage, have not been extensively screened for rootworm resistance. The objective of this study was to evaluate 5 new cultivars (NC-V 11, VA-C 92R, VA 93B, Nc 10C, and AgraTech VC-1) and 12 advanced breeding lines (N90013E, VA 861101, VA 9211920, VA 9211289, VA 891438, VA 901072, VA 9010343, VA 8911115, VA 9109213, VA 9109235, VA 9109237, and VA 9111309) for resistance to southern corn rootworm in the laboratory and in the field. NC 7 and NC 9 were used as susceptible checks. NC 6 was used as a resistant check. All 20 lines were screened in a laboratory bioassay using first and third instar larvae placed on newly germinated seedlings. Peg and pod tissue was removed from field plantings of the eight released cultivars (only) and fed to larvae in the laboratory. Further field testing was initiated with four cultivars by introducing egg and adult stage rootworms into field cages placed over planted rows. Rootworm mortality and feeding were measured from bioassays in the lab. Peg and pod damage were obtained from field plots. NC 6 showed some significant differences in rootworm mortality from VA 93B. NC 6 is still the only cultivar of those evaluated that exhibits significant resistance to southern corn rootworm.