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Evaluation of nematicides for southern root-knot nematode management in lima bean

2017; Elsevier BV; Volume: 96; Linguagem: Inglês

10.1016/j.cropro.2017.02.015

1873-6904

Jake G. Jones, Nathan M. Kleczewski, Johan Desaeger, Susan L. F. Meyer, Gordon C. Johnson,

Genetic and Environmental Crop Studies

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 nematicidal products on RKN in lima bean experiments conducted in greenhouse (GH) and microplot (MP) settings. Treatments included fluensulfone at low and high labeled rates, fluopyram, spirotetramat, fluopyram + spirotetramat, oxamyl, ethoprophos, 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 RKN-infested tomato root tissue and soil grown in the greenhouse. Root galling, RKN egg and juvenile densities, and aboveground plant dry masses were determined and analyzed using Mixed Model ANOVA. In the GH trials, fluensulfone at both rates provided the greatest reduction in RKN galling compared to the untreated control, whereas spirotetramat treatments were not significantly different from the untreated control. In the MP 2 trial, all treatments except spirotetramat significantly reduced RKN populations and had significantly greater yields relative to the untreated control. Oxamyl, ethoprophos, and fluensulfone (1.64 L ai/ha and 2.34 L ai/ha) treatments had the highest yields in the microplot study. Based on these results, the two new nematicides, fluensulfone and fluopyram, show good potential for managing RKN in lima beans.