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Evaluation of Nematicides for Control of Southern Root-Knot Nematodes in Lima Bean
J. JONES (1), G. Johnson (1), N. Kleczewski (1), J. Desaeger (2) (1) University of Delaware, U.S.A.; (2) DuPont Crop Protection, U.S.A.

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Southern root-knot nematodes (Meloidogyne incognita-RKN) significantly reduce lima bean (Phaseolus lunatus) yields. Chemical control options for RKN are limited. We evaluated the efficacy of new nematicides on RKN in lima bean experiments conducted in greenhouse (GH) and microplot (MP) settings. Treatments included Nimitz at low and high labeled rates, Luna, Movento, Luna+Movento, Vydate, Mocap and an untreated, RKN infested control. GH treatments were arranged in a factorial design, with application of nematode eggs (0, 6,000, or 30,000 eggs pot-1) crossed with nematicide treatment. MP treatments were arranged in a randomized complete block design and all plots were infested with 4.80 kg of RKN infected tomato root tissue and soil. Root galling, RKN eggs and juveniles, and aboveground plant dry masses were determined and statistically analyzed using Mixed Model ANOVA. In the GH study, Nimitz at both rates provided the greatest reduction in RKN galling compared to the controls, whereas Movento treatments were not significantly different than the controls. In the MP study, all treatments except Movento significantly reduced RKN populations and had significantly greater yields relative to controls. Vydate, Mocap, and Nimitz (high and low rate) treatments had the highest yields in the MP study. Based on these results, several new nematicides show potential for managing RKN in lima beans.