Submitted to: American Peanut Research and Education Society Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/11/2006
Publication Date: 7/31/2006
Citation: Timper, P., Brenneman, T.B., Hanna, W.W. 2006. Pearl millet as a rotation crop for reducing nematodes and soil-borne diseases in peanut [abstract]. In: Proceedings of the American Peanut Research and Education Society, July 11-14, 2006, Savannah, GA. 38:48. Interpretive Summary:
Technical Abstract: Our objective was to determine the effects of pearl millet on root-knot nematodes (Meloidogyne arenaria), stem rot, and Rhizoctonia limb rot when planted in rotation with peanut. The experiment was conducted in a field naturally infested with the nematode. Peanut was rotated with either two years of TifGrain 102 (nematode-resistant pearl millet), two years of HGM-100 (susceptible pearl millet), or two years of corn (Pioneer 3223). Two staggered sequences of each rotation were included so that a sequence would be completed in 2004 and in 2005. Both peanut cultivars (Georgia Green in 2004 and Georgia-02C in 2005) used in the study were susceptible to M. arenaria. The experimental design was a randomized, complete block with six replications per sequence. A root-gall index (0 to 10 scale) was used to determine nematode damage to peanut at the end of the season. Yield and disease ratings (TSWV, stem rot, and Rhizoctonia limb rot) were also determined for the peanut crop. Root galling caused by root-knot nematodes was greater in peanut following two years of HGM-100 (7.5) than following TifGrain 102 (4.6) and corn (4.8). The severity of TSWV, stem rot, and Rhizoctonia limb rot were unaffected by rotation. In 2004, peanut yields were extremely low because of heavy TSWV pressure and did not differ among rotations. However, in 2005, peanut yields were greater following two years of corn (2504 kg/ha) and TifGrain 102 (2320 kg/ha) than following HGM-100 (1821 kg/ha). We conclude that pearl millet hybrids which are resistant to M. arenaria will be a beneficial rotation crop for peanut; whereas, hybrids that are susceptible to the nematode may increase populations of the nematode and subsequent damage to the peanut crop.