Potential of <scp>UV‐C</scp> for management of two‐spotted spider mites and thrips in Florida strawberry

Montemayor, Joseph D.; Smith, Hugh A.; Peres, Natália A.; Lahiri, Soumendra N.

doi:10.1002/ps.7263

Cited by 10 publications

(8 citation statements)

References 30 publications

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“…Over a week, 60 J m −2 nightly is a similar total dose as 200 J m −2 twice a week; however, fewer applications at higher doses may have different effects on cyclamen mite than frequent, lower doses. For example, a higher dose may be stage-specific, as twospotted spider mite egg hatchability was about 1% at 200 J m −2 (Montemayor et al 2022). Phytotoxicity was not reported in field experiments (Onofre et al 2021), and we did not observe any adverse effects on strawberry plants in any of our experiments.…”

Section: Discussionmentioning

confidence: 54%

“…Twospotted spider mite (Tetranychus urticae C.L. Koch), which is primarily found on the undersides of open leaves, escaped or was killed by UV-C, and surviving females laid few eggs (Suzuki et al 2009;Montemayor et al 2022). Populations of twospotted spider mite on strawberry plants were very low (no plants had webbing) after daily, night-time UV-C treatment for 4 weeks (Short et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Ultraviolet-C irradiation has no short-term, direct effects on cyclamen mite (Phytonemus pallidus (Banks)) in strawberry

Renkema,

Takeda,

Janisiewicz

2023

Can. J. Plant Sci.

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Cyclamen mite is a nearly global pest of strawberry, inhabiting concealed spaces within folded leaves and flower buds emerging from plant crowns. It feeds on new plant tissue causing leaf discoloration and deformation, stunted plants, fruit bronzing and cracking, and yield losses at high population levels. Because UV-C irradiation is a promising new tool for disease and pest management in strawberry, and because there are few control options for cyclamen mite, we tested the direct, short-term effects of UV-C on cyclamen mite populations in potted strawberry plants in a controlled environment. Results from three experiments showed few differences in cyclamen mite populations on controls versus plants treated with UV-C (0.237 W m-1) for three or four weeks. In the second experiment, using a different strawberry cultivar and directing the UV-C from above the plant crown only, there was indication of a mild effect that may be due to some direct mortality and/or indirectly to plant defenses. However, longer-term studies will need to be conducted to determine whether pre-infestation exposure to UV-C can enable strawberry plants to better resist or tolerate cyclamen mite populations. Direct mortality did not occur as in previous experiments with pests, like twospotted spider mite, that live primarily on opened leaves.

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Ultraviolet-C irradiation has no short-term, direct effects on cyclamen mite (Phytonemus pallidus (Banks)) in strawberry

Renkema,

Takeda,

Janisiewicz

2023

Can. J. Plant Sci.

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“…However, companies like Saga Robotics (Oslo, Norway) already have a robot autonomous platform (Thorvald) that uses UVC light treatment applications to control powdery mildew (Podosphaera aphanis Wallroth Braun & Takamatsu and Uncinula necator Scwein Burrill (Erysiphales: Erysiphaceae)) in strawberries, and vineyards, respectively. The Thorvald platform was used successfully used to control the spider mite, T. urticae, in strawberries (Montemayor et al 2023). We possibly could modify this platform or construct a similar one that is designed for different crops in which B. tabaci is a pest.…”

Section: Resultsmentioning

confidence: 99%

Effect of ultraviolet radiation (UVC) on Bemisia tabaci eggs

O’Hearn

2023

Preprint

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Bemisia tabaci, the silverleaf whitefly, is a serious pest, and vector for disease, in many agricultural crops. The current common control strategy for this pest is applications of chemical synthetic insecticides. Resistance to several insecticides has already been observed in this species. If non-chemical control options were available, their use could reduce the reliance of insecticides and help slow insecticide resistance in this whitefly. Ultraviolet (UV) radiation is nonvisible radiation with wavelengths ranging from 100 nm to 400 nm. UVC, wavelengths 100 nm to 280 nm, has been found to have insecticidal properties. UVC radiation of wavelength 254 was tested on B. tabaci eggs at 2 different distances, 49.5 cm and 30.5 cm, and at 4 different times, 15 (s), 30 (s), 60 (s), and 90 (s) per distance to see what effect they had on the eggs of B. tabaci. All UVC applications tested had a significant reduction in hatching when compared to the control based on an analysis of variance (One-way ANOVA) and pos-hoc Tukey HSD test. LD50, LD90, and LD95 were calculated. At 49.5 cm irradiation times were found to be, LD50 = 31.8 (s), LD90 = 86.9 (s), and LD95 = 80.5 (s). For the 30.5 cm distance irradiation times were, LD50 = 19.2 (s), LD90 = 63.1 (s), and LD95 = 75.5 (s). This study shows that UVC might be a viable non-chemical control option for controlling B. tabaci.

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“…Other researchers have tested the effect of UV-C exposure on thrips and other pests. Montemayor et al [18] reported that low doses of UV-C (200 and 350 J/m 2 ) applied to field-grown strawberries had little to no effect on WFT or Scirtothrips dorsalis compared with untreated controls. However, the UV-C dose used in that study was considerably less than those we tested.…”

Section: Discussionmentioning

confidence: 99%

“…Research demonstrated that UV-C exposure significantly diminished egg hatching and adult emergence, leading to a prolonged development time in grain beetles [17]. Studies on the impact of UV irradiance on two-spotted spider mite, Tetranychus urticae, revealed that exposure to both UV-C and UV-B significantly increased mortality and inhibited oviposition in non-diapausing females [18][19][20][21]. Similarly, nightly UV-C treatments have been shown to significantly reduce populations of greenhouse whiteflies, Trialeurodes vaporariorum, offering a possible non-chemical means of management on tomatoes [22].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ultraviolet-C Exposure on Western Flower Thrips, Frankliniella occidentalis, and Ornamental Plants

Davari,

Sullivan,

Rea

et al. 2024

IJPB

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Western flower thrips, Frankliniella occidentalis (WFT), is one of the most destructive insect pests of vegetables and ornamental crops globally. Ultraviolet-C (UV-C) exposure has been shown to reduce populations of arthropod pests, including whiteflies and two-spotted spider mites, but has not been fully assessed for WFT. The goal of this study was to determine if UV-C radiance could be a viable strategy for inclusion in integrated pest management (IPM) programs for WFT. The objectives were to (1) assess the relationship among UV-C dose (irradiance × duration) and mortality of WFT adults and second instar larvae, (2) determine the effect of UV-C on WFT fecundity and egg hatch, and (3) assess the effect of the WFT lethal dose of UV-C on three WFT-prone ornamental plants. A UV-C dose is measured in Joules, which equals power (watts) × exposure time. A dose-dependent relationship between UV-C exposure and mortality of WFT larvae and adults was observed. At the doses of 0.98 and 0.68 J/cm2 (5 and 4 min exposure, respectively), 50% of the larvae died within 24 and 48 h, respectively. The UV-C dose needed to achieve 50% mortality was higher for adults than larvae, occurring at 5.2 and 4.4 J/cm2 (35 min and 25 min exposure, respectively) within 72 and 120 h, respectively. The number of eggs laid by surviving WFT subjected to UV-C treatment was less than by those that were untreated, and the egg-laying period was significantly shorter among those treated with UV-C. When leaves containing WFT eggs were exposed to UV-C doses known to cause 30–40% mortality in adults, 86–98% fewer eggs hatched compared to untreated controls. Ornamental plants exposed to UV-C doses lethal to eggs, second instars, and adult WFT either showed no damage, or when damage occurred, plants recovered within 14–30 days. Additional studies under controlled greenhouse conditions are needed to elucidate the effectiveness of UV-C radiance against WFT over time and its compatibility with biological control and other IPM practices.

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Potential of UV‐C for management of two‐spotted spider mites and thrips in Florida strawberry

Cited by 10 publications

References 30 publications

Ultraviolet-C irradiation has no short-term, direct effects on cyclamen mite (Phytonemus pallidus (Banks)) in strawberry

Ultraviolet-C irradiation has no short-term, direct effects on cyclamen mite (Phytonemus pallidus (Banks)) in strawberry

Effect of ultraviolet radiation (UVC) on Bemisia tabaci eggs

Effects of Ultraviolet-C Exposure on Western Flower Thrips, Frankliniella occidentalis, and Ornamental Plants

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