Laboratory and Field Susceptibility of<i>Drosophila suzukii</i>Matsumura (Diptera: Drosophilidae) to Entomopathogenic Fungal Mycoses

Alnajjar, Gabriel; Drummond, Francis A.; Groden, Eleanor

doi:10.3954/1523-5475-33.1.111

Cited by 15 publications

(11 citation statements)

References 37 publications

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“…We agree that their warning is warranted. In a previous study we showed that only 15–20% of flies in a caged population are captured by the type of trap that we used in this study [46]. In addition, Briem et al [16] show that trap captures for D. suzukii can be affected by the environment surrounding the trap and weather conditions.…”

Section: Discussionmentioning

confidence: 85%

Population Dynamics of Spotted Wing Drosophila (Drosophila suzukii (Matsumura)) in Maine Wild Blueberry (Vaccinium angustifolium Aiton)

Drummond

Ballman

Collins

2019

Insects

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A long-term investigation of D. suzukii dynamics in wild blueberry fields from 2012–2018 demonstrates relative abundance is either still increasing or exhibiting periodicity seven years after the initial invasion. Relative abundance is determined by physiological date of first detection and air temperatures the previous winter. Date of first detection of flies does not determine date of fruit infestation. The level of fruit infestation is determined by year, fly pressure, and insecticide application frequency. Frequency of insecticide application is determined by production system. Non-crop wild fruit and predation influences fly pressure; increased wild fruit abundance results in increased fly pressure. Increased predation rate reduces fly pressure, but only at high abundance of flies, or when high levels of wild fruit are present along field edges. Male sex ratio might be declining over the seven years. Action thresholds were developed from samples of 92 fields from 2012–2017 that related cumulative adult male trap capture to the following week likelihood of fruit infestation. A two-parameter gamma density function describing this probability was used to develop a risk-based gradient action threshold system. The action thresholds were validated from 2016–2018 in 35 fields and were shown to work well in two of three years (2016 and 2017).

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Section: Discussionmentioning

confidence: 85%

Population Dynamics of Spotted Wing Drosophila (Drosophila suzukii (Matsumura)) in Maine Wild Blueberry (Vaccinium angustifolium Aiton)

Drummond

Ballman

Collins

2019

Insects

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“…It should be noted in this study (and more generally in field pest abundance studies) that although trap catches are a measure of in‐field abundance, they do not necessarily reflect true abundances and therefore crop risk 22,23,62 . During periods of abundant ripening fruits, the traps are in direct competition with crop and non‐crop food sources for attracting adult flies.…”

Section: Discussionmentioning

confidence: 91%

Global analysis of the seasonal abundance of the invasive pest Drosophila suzukii reveal temperature extremes determine population activity potential

Ørsted

Lye²,

Umina

et al. 2021

Pest Management Science

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BACKGROUND The global pest spotted winged drosophila (Drosophila suzukii) continues to have a significant economic impact on fruit production in areas where it is established, in addition to newly invaded ranges. Management activities spanning national biosecurity responses to farm‐scale pest control are limited by the inability to predict the timing and severity of seasonal outbreaks of D. suzukii and its climatic drivers. RESULTS Here, we compiled and analysed data on international seasonal abundances for D. suzukii under different climates, crop types and management contexts to improve the predictability of seasonal population dynamics. In relating seasonal abundances to environmental predictors, specifically temperature, we found strong negative effects of exposure to high and low temperatures during the preceding month. Unlike most regional studies on D. suzukii phenology that focus on temperature in the physiological development range, we show that thermal extremes better explain seasonal population fluctuations. CONCLUSION Although trap catches remain an indirect measure of infestations and must be interpreted carefully in terms of crop risk, our results should support monitoring programmes through enhanced knowledge of the climatic factors affecting D. suzukii population activity. The negative impact of high temperatures suggests that late‐season management strategies focusing on manipulating crop microclimates to temperatures above 25 °C can reduce D. suzukii abundance. We show that early season abundance is modulated by climate, particularly the depth of cold extremes experienced in the preceding time interval. These associations may be further developed into early‐season crop risk forecasts to support monitoring programs. © 2021 Society of Chemical Industry.

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“…The short generational period of the spotted wing drosophila make fecundity an important target in control. A similar strategic approach by Alnajjar et al (2018), focusing on fecundity of the spotted wing drosophila with pathogenic fungi, found that sub-lethal doses of the fungus, Beauveria bassiana (Bals.) Vuill.…”

Section: Resultsmentioning

confidence: 99%

“…Current spotted wing drosophila management is mostly based upon use of synthetic insecticide applications, many of which are organophosphates and toxic to farm workers (Clavert et al, 2008). Although, cultural control tactics and biological control such as mass trapping, exclusion netting, sanitation during and after harvest, conservation of predators, use of pathogens, and removal of wild fruit hosts are being researched (Bohinc and Trdan, 2014;Alnajjar et al, 2017;Alnajjar et al, 2018;Ballman et al, 2017;Ballman and Drummond, 2018). An insecticide for spotted wing drosophila control with low mammalian toxicity would help minimize health risks to farm workers, consumers, and exposed wildlife.…”

Section: Introductionmentioning

confidence: 99%

Octabor (boron) as a Low Toxicity Control Tactic for the Spotted Wing Drosophila, Drosophila suzukii (Matsumura)

Cloutier

Drummond

Collins

2018

JAS

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The recently introduced spotted wing drosophila is one of the most serious pests in small fruit production in the United States and Europe. Most control relies upon multiple applications of synthetic insecticides. In an effort to find less-toxic insecticides to consumers, farm workers, and wildlife, we conducted two laboratory trials and a semi-field trial in order to assess the potential for disodium octaborate tetrahydrateformulated and sold as Octabor®(U.S. Borax, Inc.) as a control for spotted wing drosophila in wild blueberry. We found that Octabor at 0.6 and 1.0% (w/v) applied to wild blueberry fruit resulted in higher mortality of flies than non-treated control fruit. Addition of sugar to Octabor enhanced mortality in one of the two trials, with an interaction between sugar addition and Octabor rate suggesting that the addition of sugar provided the greatest enhancement at the low rate. Our semi-field study showed that an apparent repellency effect of Octabor provided protection of fruit from infestation for up to 3 days. Also in the semi-field study, we observed a delayed effect on fly mortality. Increased fly mortality occurred over time, relative to the non-treated control fruit. The greatest fly mortality, relative to the non-treated control, resulted from flies being exposed to fruit treated 3 and 7 days prior to fly exposure, but not immediately after the treatment of Octabor. We speculate on why this type of delay in mortality might have occurred.

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Laboratory and Field Susceptibility ofDrosophila suzukiiMatsumura (Diptera: Drosophilidae) to Entomopathogenic Fungal Mycoses

Cited by 15 publications

References 37 publications

Population Dynamics of Spotted Wing Drosophila (Drosophila suzukii (Matsumura)) in Maine Wild Blueberry (Vaccinium angustifolium Aiton)

Population Dynamics of Spotted Wing Drosophila (Drosophila suzukii (Matsumura)) in Maine Wild Blueberry (Vaccinium angustifolium Aiton)

Global analysis of the seasonal abundance of the invasive pest Drosophila suzukii reveal temperature extremes determine population activity potential

Octabor (boron) as a Low Toxicity Control Tactic for the Spotted Wing Drosophila, Drosophila suzukii (Matsumura)

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