Nimitz (Mcw-2) for Management of Root-Knot Nematode in Tomatoes

Westerdahl, B. B.; Long, Don M.; Schiller, Chuck; Wilen, C. A.

doi:10.17660/actahortic.2015.1069.36

Cited by 3 publications

(3 citation statements)

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“…One of the new nematicides is fluensulfone, which belongs to the heterocyclic fluoroalkenyl sulfones, a new chemical family . Its nematicidal activity is very high, especially against Meloidogyne species, in the laboratory and under field conditions . However, efficacy is affected by nematode species or populations, and soil type .…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to fluensulfone of inactivated Meloidogyne spp. second‐stage juveniles

Oka

2020

Pest Management Science

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BACKGROUND: Nonfumigant nematicide efficacy is affected by several factors, such as nematode species and environmental conditions. However, the influence of nematodes' physiological status on nematicide efficacy is unknown. Inactive nematodes, such as those in quiescence or dormancy, seem to be more tolerant to nematicides than active ones. Second-stage juveniles of Meloidogyne species were inactivated by low temperatures and reversible nematicides before and during exposure to fluensulfone. The sensitivity of inactive juveniles to fluensulfone the nematicide was compared to that of active juveniles by EC 50 (median effective concentration) for juvenile immobilization and root gall reduction.RESULTS: Inactivating Meloidogyne hapla and Meloidogyne javanica juveniles at 5°C increased the EC 50 (median effective concentration) of fluensulfone for immobilization of and root galling by Meloidogyne spp. 3.6 to 9.5 times. When the exposure temperature was decreased from 25 to 15°C, EC 50 for M. javanica root gall reduction after 24 and 48 h exposure increased 3.1 and 4.9 times, respectively, whereas for M. hapla, it increased 2.3 and 2.0 times, respectively. Juveniles of M. javanica and M. incognita immobilized by fenamiphos were as sensitive to fluensulfone as active juveniles based on the number of root galls. However, juveniles of these species immobilized by fluopyram were more tolerant to fluensulfone than untreated active juveniles. An interaction of fluopyram and fluensulfone activities is suggested. CONCLUSION: Changes in the sensitivity of inactive Meloidogyne spp. juveniles to fluensulfone depend on the inactivation method. Fluensulfone could be better applied when nematodes are active in the soil.

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Section: Introductionmentioning

confidence: 99%

Sensitivity to fluensulfone of inactivated Meloidogyne spp. second‐stage juveniles

Oka

2020

Pest Management Science

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“…This nematicide has shown high nematicidal activity, especially against root‐knot nematodes ( Meloidogyne spp. ), in the laboratory and under field conditions . Aside from its low toxicity to non‐target organisms, fluensulfone has some preferred features as a nematicide: real nematicidal activity rather than nematostatic effects, systemic nematicidal activity, and no evidence of enhanced biodegradation in the soil .…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the control mechanism is suggested to consist of inhibition of nematode locomotion, feeding and development in host plants . Fluensulfone and fluopyram are effective against root‐knot nematodes at low concentrations, but their effect on nematodes at sublethal concentrations during root infection is not known. In the present study, the effects of fluensulfone and fluopyram on mobility, attraction to roots and infection of Meloidogyne javanica and two M. incognita populations were studied in vitro, and compared among nematodes.…”

Section: Introductionmentioning

confidence: 99%

Effect of fluensulfone and fluopyram on the mobility and infection of second‐stage juveniles of Meloidogyne incognita and M. javanica

Oka

Saroya

2019

Pest Management Science

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BACKGROUND: Fluensulfone and fluopyram are new nematicides whose mode of action is not fully understood. Differences in the nematicidal activity of these compounds among two Meloidogyne incognita populations and a Meloidogyne javanica population, and the effect of sublethal exposure to the nematicide on their infection process were studied in vitro. RESULTS: The M. incognita populations were more sensitive to fluensulfone than M. javanica, whereas M. javanica was more sensitive to fluopyram. A more than 10-fold difference in median lethal concentration (LC 50 ) was observed between the M. incognita populations after 17-h exposure to fluensulfone. Exposure of M. incognita and M. javanica to 4 mg L −1 fluopyram for 48 h resulted in irreversible immobilization, whereas lower concentrations or 17-h exposure to fluopyram caused reversible immobilization. Pre-exposure of M. javanica to fluensulfone at sublethal concentrations reduced the number of juveniles attracted to root tips and caused smaller galls. Pre-exposure to fluopyram delayed the nematodes' attraction. Presence of fluopyram in a Pluronic gel at concentrations that immobilized the nematodes in water showed no or only slight inhibition of the nematodes' attraction to root tips and gall formation. CONCLUSION: Different sensitivities to nematicides were observed among Meloidogyne species and populations. Sublethal exposure to fluensulfone reduced nematode attraction to root tips and infection. Pluronic gel negatively affected nematicidal activity, especially for fluopyram.

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