|JONES, JAKE - University Of Delaware|
|KLECZEWSKI, NATHAN - University Of Delaware|
|DESAEGER, JOHAN - University Of Florida|
|JOHNSON, GORDON - University Of Delaware|
Submitted to: Crop Protection
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/13/2017
Publication Date: 6/1/2017
Citation: Jones, J.G., Kleczewski, N.M., Desaeger, J., Meyer, S.L.F., Johnson, G.C. 2017. Evaluation of nematicides for southern root-knot nematode management in lima bean. Crop Protection. 96(1):151-157. https://doi.org/10.1016/j.cropro.2017.02.015
Interpretive Summary: Root-knot nematodes (RKN) cause significant crop losses in lima bean production. Because chemical control options are limited, selected nematicidal products were tested in the greenhouse and in microplots for effects on root galling caused by the nematodes, numbers of nematode eggs and juveniles, and lima bean plant weights. In the greenhouse, fluensulfone provided the greatest reduction in root galling compared to the untreated control. In one or both microplot trials, oxamyl, ethoprop, and fluensulfone treatments reduced RKN populations and had the highest yields. Based on these results, two new nematicides, fluensulfone and fluopyram, show good potential for managing RKN in lima beans. This work will be used by research scientists and agronomists for determining efficacious methods for reducing yield losses caused by these plant-parasitic nematodes.
Technical Abstract: 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 infected tomato root tissue and soil grown in the greenhouse. Root galling, RKN egg and juvenile numbers, and aboveground plant dry masses were determined and analyzed using Mixed Model ANOVA. In the GH studies, 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 study, all treatments except spirotetramat significantly reduced RKN populations and had significantly greater yields relative to the untreated control. Oxamyl, ethoprophos, and fluensulfone (high and low rate) 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.