<abstract xmlns="http://www.w3.org/1999/xhtml">

Tioxazafen is a seed-applied nematicide used in row crops. Currently, there are no data on nematode toxicity, nematode recovery, or effects of low concentrations of tioxazafen on nematode infection of a host root for <italic>Meloidogyne incognita</italic> or <italic>Rotylenchulus reniformis</italic>. Nematode toxicity and recovery experiments were conducted in water solutions of tioxazafen, while root infection assays were conducted on tomato. Nematode paralysis was observed after 24 hr of exposure at 27.0 µg/ml tioxazafen for both the nematode species. Based on an assay of nematode motility, 24-hr EC50 values of 57.69 µg/ml and 59.64 µg/ml tioxazafen were calculated for <italic>M. incognita</italic> and <italic>R. reniformis</italic>, respectively. Tioxazafen rates of 2.7 µg/ml and 27.0 µg/ml reduced the nematode hatch after 3 d of exposure for both the nematode species. There was no recovery in nematode motility after the 24-hr exposure of <italic>M. incognita</italic> and <italic>R. reniformis</italic> to their corresponding 48-hr EC50 values of 47.15 µg/ml and 47.25 µg/ml tioxazafen, respectively. Mortality of <italic>M. incognita</italic> continued to increase after 24 hr exposure, whereas <italic>R. reniformis</italic> mortality remain unchanged after nematodes were rinsed and removed for 48 hr from the tioxazafen solution. A 24-hr exposure to low concentrations of 0.38 to 47.15 µg/ml for <italic>M. incognita</italic> and 47.25 µg/ml for <italic>R. reniformis</italic> reduced the infectivity of each nematode species on tomato roots. The toxicity of tioxazafen was similar between nematode species; however, a greater rate of tioxazafen was needed to suppress <italic>R. reniformis</italic> infection of tomato than for <italic>M. incognita</italic>.
</abstract>

Tioxazafen is a seed-applied nematicide used in row crops. Currently, there are no data on nematode toxicity, nematode recovery, or effects of low concentrations of tioxazafen on nematode infection of a host root for Meloidogyne incognita or Rotylenchulus reniformis. Nematode toxicity and recovery experiments were conducted in water solutions of tioxazafen, while root infection assays were conducted on tomato. Nematode paralysis was observed after 24 hr of exposure at 27.0 µg/ml tioxazafen for both the nematode species. Based on an assay of nematode motility, 24-hr EC50 values of 57.69 µg/ml and 59.64 µg/ml tioxazafen were calculated for M. incognita and R. reniformis, respectively. Tioxazafen rates of 2.7 µg/ml and 27.0 µg/ml reduced the nematode hatch after 3 d of exposure for both the nematode species. There was no recovery in nematode motility after the 24-hr exposure of M. incognita and R. reniformis to their corresponding 48-hr EC50 values of 47.15 µg/ml and 47.25 µg/ml tioxazafen, respectively. Mortality of M. incognita continued to increase after 24 hr exposure, whereas R. reniformis mortality remain unchanged after nematodes were rinsed and removed for 48 hr from the tioxazafen solution. A 24-hr exposure to low concentrations of 0.38 to 47.15 µg/ml for M. incognita and 47.25 µg/ml for R. reniformis reduced the infectivity of each nematode species on tomato roots. The toxicity of tioxazafen was similar between nematode species; however, a greater rate of tioxazafen was needed to suppress R. reniformis infection of tomato than for M. incognita.

Toxicity of Tioxazafen to <italic>Meloidogyne incognita</italic> and <italic>Rotylenchulus reniformis</italic>

Division of Agriculture, Cooperative Extension Service, Lonoke Extension Center

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Tioxazafen is a seed-applied nematicide used in row crops. Currently, there are no data on nematode toxicity, nematode recovery, or effects of low...

Toxicity of Tioxazafen to Meloidogyne incognita and Rotylenchulus reniformis

Article Category: Research Paper

Published Online: Apr 17, 2022

Page range: -

Received: Dec 09, 2021

DOI: https://doi.org/10.2478/jofnem-2022-0007

Keywords
behavior, EC, hatch, nematicides, recovery, reniform nematode, southern root-knot nematode, toxicity

© 2022 Travis R. Faske et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Toxicity of Tioxazafen to Meloidogyne incognita and Rotylenchulus reniformis

Article Category: Research Paper

Published Online: Apr 17, 2022

Page range: -

Received: Dec 09, 2021

DOI: https://doi.org/10.2478/jofnem-2022-0007

Keywordsbehavior, EC, hatch, nematicides, recovery, reniform nematode, southern root-knot nematode, toxicity

© 2022 Travis R. Faske et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
behavior, EC, hatch, nematicides, recovery, reniform nematode, southern root-knot nematode, toxicity