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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #85071
Title: CROP YIELDS AND NEMATODE POPULATION DENSITIES IN TRITICALE-COTTON AND TRITICALE-SOYBEAN ROTATIONS.

Author
item Johnson, Alva
item DOWLER, C - ARS - RETIRED
item SUMNER, D - UNIVERSITY OF GEORGIA
item BAKER, S - UNIVERSITY OF GEORGIA
item Handoo, Zafar

Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/5/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary: More energy-efficient crop production systems are needed for growers. Conservation tillage systems are increasing in the southern states. Triticale, cotton, and soybean were arranged in three cropping sequences to determine the effects of a nematicide (fenamiphos) and cropping sequences on nematode population densities and crop yields under strip tillage for 4 years. The cropping sequences were triticale (T)-cotton(C)-T-C, T-soybean(S)-T-S, and T-C-T-S. Numbers of root-knot nematodes declined on triticale, and remained low until harvest, but increased on cotton and soybean each year. Root damage on cotton and soybean was low and not affected by the nematicide. Yields of triticale in all cropping sequences declined over the years. Cotton and soybean yields were not affected by the nematicide treatment. Root-knot resistant cotton and soybean were grown successfully with no reduction in yields caused by nematodes in strip tillage following triticale harvested for grain. Results of this study provides growers more options for energy-efficient cotton and soybean production systems with reduced use of nematicides.

Technical Abstract: Triticale cv. Beagle 82, cotton cv. McNair 235, and soybean cv. Twiggs were arranged in three cropping sequences to determine the effects of fenamiphos and cropping sequences on nematode population densities and crop yields under strip tillage for 4 years. The cropping sequences were triticale (T)- cotton(C)-T-C, T-soybean(S)-T-S, and T-C-T-S. Numbers of Meloidogyne incognita second- -stage juveniles declined on triticale and remained low until harvest, but increased on cotton and soybean each year. Numbers of Pratylenchus brachyurus were maintained on triticale and increased to greater numbers on soybean than cotton. Numbers of Helicotylenchus dihystera were lower in all plots during the first year and increased thereafter in untreated p]ots in the T-C-T-C and T-S-T-S sequences. Root-gall indices of cotton and soybean caused by M. incognita ranged from 1.00 to 1.08 each year and were not affected by the fenamiphos treatment or cropping sequences. Yields of triticale in all cropping sequences declined over the years. Cotton and soybean yields were not affected by fenamiphos at 6.7 kg a.i./ha. Cotton and soybean were grown successfully with little or no suppression in yields caused by nematodes in conservation tillage following triticale harvested for grain.