Understanding the Efficacy of Hexythiazox Against Twospotted Spider Mites in Strawberry, 2022

Gireesh, Midhula; Perry, Chastity; Lahiri, Soumendra N.

doi:10.1093/amt/tsac117

Cited by 2 publications

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“…In Florida, the strawberry arthropod pest complex is comprised of several pests including various thrips species such as Frankliniella occidentalis Pergande, Frankliniella bispinosa Morgan, and the invasive Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), with the latter being the prominent pest (Lahiri and Panthi 2020;Panthi and Renkema 2020;Panthi et al 2021). Additionally, the pest complex includes various phytophagous mite species with Tetranychus urticae Koch (Trombidiformes: Tetranychidae) (twospotted spider mite) being the predominant mite pest (Liu et al 2016;Akyazi and Liburd 2019;Gireesh et al 2022;Lahiri et al 2022;Montemayor et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Residual effect of commonly used fungicides in strawberries on Amblyseius swirskii, Neoseiulus cucumeris, and Neoseiulus californicus (Mesostigmata: Phytoseiidae)

Busuulwa,

Revynthi,

Liburd

et al. 2024

Exp Appl Acarol

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Florida’s strawberry industry is currently valued at $511 million annually but faces challenges from pathogens and arthropod pests especially Tetranychus urticae Koch (twospotted spider mite) and Scirtothrips dorsalis Hood (chilli thrips). Predatory mites, particularly Neoseiulus cucumeris Oudemans, Neoseiulus californicus McGregor, and Amblyseius swirskii Athias-Henriot, play a crucial role in pest management. However, there are concerns regarding how these biological control agents are affected by fungicides used in current pathogen management strategies. This study assessed the residual effects of commonly used fungicides in strawberries on the survival, feeding, and oviposition of these predatory mites. Commercially sourced predatory mites were reared on S. dorsalis larvae, and gravid female predators placed on fungicide treated strawberry leaf discs in a Munger cell for 120 h. Fungicides tested included two formulations of Captan, hydrogen peroxide + peroxyacetic acid, cyprodinil + fludioxonil, tetramethylthiuram disulfide, cyflufenamid and a control. All fungicides tested had an impact on the survival, feeding, and oviposition of the predators. Among the fungicide treatments, the lowest predator survival was observed in the cyprodinil + fludioxonil treatment, while the highest was observed in the hydrogen peroxide + peroxyacetic acid and tetramethylthiuram disulfide treatments. In all treatments, feeding and oviposition greatly varied among predators; specifically, N. cucumeris and A. swirskii had the lowest prey consumption, while N. californicus had the highest. These findings highlight the potential incompatibility between fungicides and predatory mites and demonstrate the need for the development of a fungicide rotation program tailored to the different susceptibilities of predators to fungicides.

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Section: Introductionmentioning

confidence: 99%

Residual effect of commonly used fungicides in strawberries on Amblyseius swirskii, Neoseiulus cucumeris, and Neoseiulus californicus (Mesostigmata: Phytoseiidae)

Busuulwa,

Revynthi,

Liburd

et al. 2024

Exp Appl Acarol

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Residual effect of commonly used insecticides on key predatory mites released for biocontrol in strawberry

Busuulwa,

Riley,

Revynthi

et al. 2024

Journal of Economic Entomology

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Florida is the second largest producer of strawberries in the United States. However, the production system faces numerous challenges, especially Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) infestations. Management of this pest involves applying insecticides and use of predatory mites, particularly Amblyseius swirskii Athias-Henriot, Neoseiulus cucumeris Oudemans, and Neoseiulus californicus McGregor (Mesostigmata: Phytoseiidae). Strawberry growers in Florida are concerned about the compatibility of the commercial formulations of insecticides used in strawberry pest management with predatory mites. This study assessed the residual effect of commercial insecticides used in strawberry production on the survival, feeding, and oviposition of the 3 predators. Using Munger cells, predators were exposed to commercial formulations of spinetoram, cyantraniliprole, azadirachtin + pyrethrin, Beauveria bassiana, Cordyceps javanica, capsicum, garlic, and canola oil extracts, and water control. There was a gradual decline in the survival and feeding of predatory mites when exposed to all insecticides. Spinetoram had the highest impact on the survival and feeding of all predators compared to other insecticides, while C. javanica had the lowest impact. Cyantraniliprole and azadirachtin + pyrethrin significantly reduced predator survival after 72 h of exposure, whereas capsicum, garlic, and canola oil extracts caused a similar reduction after 96 h. All predators consumed low proportions of S. dorsalis across all treatments. Oviposition was low in all treatments, with no discernable variation among treatments. These results highlight the potential of using entomopathogenic fungi in conjunction with A. swirskii, N. cucumeris, and N. californicus for the management of S. dorsalis and T. urticae in strawberries.

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Understanding the Efficacy of Hexythiazox Against Twospotted Spider Mites in Strawberry, 2022

Cited by 2 publications

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Residual effect of commonly used fungicides in strawberries on Amblyseius swirskii, Neoseiulus cucumeris, and Neoseiulus californicus (Mesostigmata: Phytoseiidae)

Residual effect of commonly used fungicides in strawberries on Amblyseius swirskii, Neoseiulus cucumeris, and Neoseiulus californicus (Mesostigmata: Phytoseiidae)

Residual effect of commonly used insecticides on key predatory mites released for biocontrol in strawberry

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