Christelle Guedot

University of Wisconsin–Madison | UW · Department of Entomology

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Landscapes surrounding agroecosystems can provide resources that may benefit insect pests. This project examined the influence of the surrounding landscape on the abundance and spatial pattern of Popillia japonica (Coleoptera: Scarabaeidae) in vineyards. Twenty vineyards across Southern Wisconsin, spanning a gradient of 5-80% cropland in a 1.5km ra...

The invasive spotted-wing drosophila, Drosophila suzukii, is a major pest of fruit crops worldwide. Management of D. suzukii relies heavily on chemical control in both organic and conventional systems, and there is a need to develop more sustainable management practices. We evaluated the efficacy of three colors of plastic mulches at reducing popul...

The invasive spotted-wing drosophila, Drosophila suzukii, is a major pest of fruit crops world-wide. Management of D. suzukii relies heavily on chemical control in both organic and conventional systems, and there is a need to develop more sustainable management practices. We evaluated the efficacy of three colors of plastic mulches at reducing popu...

As insects feed, stable isotopes from their diets are assimilated into their tissues. Stable isotopes provide a method to determine what insects are feeding on, and in some cases, where the insects have been feeding. One method for evaluating what adult holometabolous insects fed on as larvae, is to sample tissues from the integument of the adult....

The brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), is a well-documented pest of agricultural crops across the globe. However, not all crops are suitable hosts for H. halys, and it is necessary to proactively document the susceptibility of economically important specialty crops, such as cranberry (Vaccinium macrocarp...

Pest management of emerging pests can be challenging because very little fundamental knowledge is available to inform management strategies. One such pest, the red-headed flea beetle Systena frontalis (Fabricius) (Coleoptera: Chrysomelidae), is increasingly being identified as a pest of concern in cranberries Vaccinium macrocarpon Aiton (Ericales:...

• Overwintering Drosophila often display adaptive phenotypic differences beneficial for survival at low temperatures. However, it is unclear which morphological traits are the best estimators of abiotic conditions, how those traits are correlated with functional outcomes in cold tolerance, and whether there are regional differences in trait express...

Spotted-wing drosophila, Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), is an invasive economic pest of soft-skinned and stone fruit across the globe. Our study establishes both a predictive generalized linear mixed model (GLMM), and a generalized additive mixed model (GAMM) of the dynamic seasonal phenology of D. suzukii based on four ye...

Evidence is accumulating that evolutionary changes are not only common during biological invasions but may also contribute directly to invasion success. The genomic basis of such changes is still largely unexplored. Yet, understanding the genomic response to invasion may help to predict the conditions under which invasiveness can be enhanced or sup...

Most cranberry (Vaccinium macrocarpon) growers rent honey bees (Apis spp.) to insure proper pollination of their crop. However, honey bees are not the most efficient pollinators of cranberry and there have been increasing efforts to improve the pollination services provided by honey bees. Cranberry flowers provide small amounts of nectar and this r...

Evidence is accumulating that evolutionary changes are not only common during biological invasions but may also contribute directly to invasion success. The genomic basis of such changes is still largely unexplored. Yet, understanding the genomic response to invasion may help to predict the conditions under which invasiveness can be enhanced or sup...

Reliable monitoring of the invasive Halyomorpha halys abundance, phenology and geographic distribution is critical for its management. Halyomorpha halys adult and nymphal captures on clear sticky traps and in black pyramid traps were compared in 18 states across the Great Lakes, Mid-Atlantic, Southeast, Pacific Northwest and Western regions of the...

The invasive vinegar fly, Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), is a major economic pest of soft-skinned fruit in the USA. In order to identify suitable biological control agents in Wisconsin, we assessed the presence and impact of potential natural enemies of D. suzukii in tart cherry and raspberry farms with documented D. suzuk...

Honey bees are the most important managed pollinator in the world. Recent trends suggest, however, that the demand for their pollination services is growing faster than the available supply. Therefore, it is critical to determine the most efficient management practices to maximize their use for crop production. One factor known to influence the eff...

Context Native pollinators provide an important ecosystem service for many pollination-dependent fruit crops, but require nesting and foraging resources in proximity to target crop plants. Landscape context and fluctuation in floral resources may influence the distribution of pollination services. Objectives This study investigates how landscape c...

Drosophila suzukii (Matsumura) is an invasive species of vinegar fly that infests soft-skinned and stone fruits. Since its first detection in the United States, D. suzukii has become a prominent economic threat in fruit crop industries, particularly affecting caneberry and sweet cherry growers. This study examined the susceptibility of tart cherrie...

Abstract. 1. The consumption of arsenic is toxic to most biota. However, a noctuid caterpillar was recently reported feeding on a plant known to hyperaccumulate arsenic. 2. The aim of this study was to investigate the effects of arsenic-rich Pteris vittata L. consumption by Callopistria floridensis G., and measure differences in arsenic concentrati...

Honeybees (Apis mellifera Linnaeus) (Hymenoptera: Apidae) play a major role in the pollination of cranberry (Vaccinium macrocarpon; Ericaceae). However, fungicide applications during cranberry bloom may affect bees foraging behavior. This research reports the amount of cranberry and noncranberry pollen brought back to hives immediately before and a...

Drosophila suzukii (Matsumura) is an invasive pest of soft-skinned fruits that has caused significant economic damage worldwide. In this study, we focused on the seasonal abundance of D. suzukii during the early years of establishment in Wisconsin. We explored the seasonal patterns of summer and winter morphs, their reproductive output, and the eff...

We develop a transdisciplinary deliberative model that moves beyond traditional scientific collaborations to include nonscientists in designing complexity-oriented research. We use the case of declining honey bee health as an exemplar of complex real-world problems requiring cross-disciplinary intervention. Honey bees are important pollinators of t...

Social wasps can be serious pests in fruit growing plantings and are becoming increasingly problematic for grape growers. In this study, we conducted two experiments to assess the species composition and seasonal phenology of social wasps in Wisconsin vineyards in 2015 and 2017. In 2015, three attractants were used: (1) wine; (2) heptyl butyrate (H...

Organic management of spotted wing drosophila in organic berry crops.

Codling moth Cydia pomonella L. (Lepidoptera: Tortricidae) is a major pest of pome fruits worldwide. Fruit is damaged by larval feeding, and numbers of larvae are directly related to the numbers of females in the preceding generation. In Pacific Northwest, apple orchards, C. pomonella are generally managed with insecticides and mating disruption. H...

Spotted-wing drosophila, Drosophila suzukii Matsumura (Diptera: Drosophilidae), is an invasive pest of soft-skinned fruits across the globe. Effective monitoring is necessary to manage this pest, but suitable attractants are still being identified. In this study, we combined lures with fermenting liquid baits to improve D. suzukii trapping specific...

Conserving carnivorous arthropods: an example from early-season cranberry (Ericaceae) flooding—ADDENDUM - Volume 150 Issue 2 - J. van Zoeren, C. Guédot, S.A. Steffan

Biological control plays an important role in many integrated pest management programmes, but can be disrupted by other control strategies, including chemical and cultural controls. In commercial cranberry ( Vaccinium macrocarpon Aiton; Ericaceae) production, a spring flood can replace an insecticide application, providing an opportunity to study t...

Sparganothis fruitworm (Sparganothis sulfureana Clemens) (Lepidoptera: Tortricidae) is a serious pest of cranberry (Vaccinium macrocarpon Aiton), a native North American fruit cultivated in northern regions of the United States and southeastern Canada. This study assessed antibiosis in several cranberry cultivars commonly grown in Wisconsin. Five c...

Detritivory is the dominant trophic paradigm in most terrestrial, aquatic, and marine ecosystems, yet accurate measurement of consumer trophic position within detrital (=“brown”) food webs has remained unresolved. Measurement of detritivore trophic position is complicated by the fact that detritus is suffused with microbes, creating a detrital comp...

Drosophila suzukii is an invasive pest of cultivated fruit crops in Europe, Asia, and the Americas. However, more information is needed to understand the extent of D. suzukii utilization of wild fruit and specialty crops as suitable hosts, such as aronia (Aronia melanocarpa), for which risk assessment has not yet been established. Both laboratory b...

The spotted wing drosophila, Drosophila suzukii (Diptera: Drosophilidae), is an emerging invasive pest, which attacks a wide variety of fruits and berries. Although previous studies have focused on different aspects of D. suzukii reproductive biology, there are no protocols available for determining the mating status of D. suzukii females and droso...

The cranberry fruitworm (Acrobasis vaccinii Riley), sparganothis fruitworm (Sparganothis sulfureana Clemens), and blackheaded fireworm (Rhopobota naevana Hübner) are historically significant pests of cranberries (Vaccinium macrocarpon Aiton) in the Upper Midwest (Wisconsin), USA. Their respective natural histories are well documented but correlatio...

Deciphering invasion routes from molecular data is crucial to understanding biological invasions, including identifying bottlenecks in population size and admixture among distinct populations. Here, we unravel the invasion routes of the invasive pest Drosophila suzukii using a multi-locus microsatellite dataset (25 loci on 23 worldwide sampling loc...

Drosophila suzukii (Diptera: Drosophilidae), known commonly as spotted wing drosophila, is a vinegar fly originating from South-East Asia and a major pest to many soft-skinned fruits. Due to the species recent arrival in North America in 2008, many fruit varieties are yet untested for susceptibility to infestation. While previous work has focused o...

Host plant resistance, an important strategy of integrated pest management, was examined in the American cranberry, Vaccinium macrocarpon Aiton (Ericaceae). Despite the pressure on cranberry growers to reduce pesticide usage, host plant resistance is not used to help manage insect populations. This studymeasured field population densities of the th...

Aggregations of Thaumatomyia glabra (Diptera: Chloropidae) were observed on flowers of Iris pallida Lamarck (Asparagales: Iridaceae), whereas no T. glabra (Meigen) were observed on nearby Iris germanica L. flowers. Sampling of T. glabra on I. pallida flowers revealed the presence of males only. In a previous study, T. glabra males were attracted to...

Natural habitats can affect the population dynamics of mobile insects, and the spatial and temporal effects on agricultural pest species may be especially relevant for tailoring management strategies to the farm context. Drosophila suzukii Matsumura (Diptera: Drosophilidae) is suspected to utilize woodland habitat for wild hosts and overwintering w...

In the summer of 2015, we conducted an experiment to assess the efficacy of an early foliar application of insecticides currently labeled for use in cranberry (Altacor, Assail, Actara, Belay, Diazinon, Imidan, and Lorsban) and insecticides not currently labeled on cranberry (Bifenthrin, Closer, a diamide, Exirel, Movento, and Venom) on cranberry fl...

The objective of this experiment was to assess the efficacy of adding the nonionic adjuvant Apsa (spreader/activator) to a late foliar application of an insecticide currently labeled for use in cranberry (Altacor) and insecticides not currently labeled on cranberry (Bifenthrin, Cyclaniliprole, and Exirel) on cranberry flea beetle (CFB). This experi...

In the summer 2015, an experiment was conducted to assess the efficacy of insecticides currently labeled for use in cranberry (Altacor, Diazinon, Assail, and Orthene), a registered insect growth regulator (Rimon), softer chemistry insecticides labeled on cranberry (Grandevo and Venerate), and insecticides not currently labeled on cranberry (cyclani...

This experiment aimed at assessing the efficacy of insecticides currently labeled for use in cranberry (Altacor, Diazinon, and Orthene), softer chemistry insecticides labeled on cranberry (Grandevo and Venerate), and insecticides not currently labeled on cranberry (cyclaniliprole, Fanfare, and Exirel) on second generation of BHFW larvae and on CEM...

The objective of this experiment was to assess the efficacy of insecticides currently labeled for use on cranberry (Altacor, Delegate, Intrepid, Confirm), softer chemistry insecticides labeled on cranberry (Grandevo and Venerate), and insecticides not currently labeled on cranberry (cyclaniliprole, Fanfare, and Exirel). Selected insecticides were a...

The objective of this experiment was to assess the efficacy of insecticides currently labeled for use in cranberry (Altacor, Delegate, Intrepid, Confirm), softer chemistry insecticides labeled on cranberry (Grandevo and Venerate), and an insecticide not currently labeled on cranberry (Exirel) in combination with the adjuvant Bond (spreader/sticker)...

The objective of this experiment was to assess the efficacy on second generation of BHFW larvae of insecticides currently labeled for use in cranberry (Fanfare, Altacor, Diazinon, Belay, Knack, Assail, Delegate, Imidan, Rimon, Lorsban, Venom, Intrepid, and Closer), softer chemistry insecticides labeled on cranberry (Grandevo and Venerate), and inse...

The objective of this experiment was to assess the efficacy of insecticides currently labeled for use in cranberry (Altacor, Belay, Assail, Delegate, Imidan, Rimon, Intrepid, Closer, Confirm), softer chemistry insecticides labeled on cranberry (Grandevo and Venerate), and insecticides not currently labeled on cranberry (Movento and Exirel) on first...

The authors wish to make the following corrections to this paper [1]: [...]

American cranberry (Vaccinium macrocarpon) is naturally adapted to environments with high concentrations of soluble iron. Yet, there is a need to further explore iron nutrition in cranberry given concerns of toxicity problems from irrigation with iron-rich water. This study investigated the threat of iron toxicity by evaluating its effects on shoot...

Drosophila suzukii is an emerging pest of soft-skinned fruit crops worldwide and sustainable pest management relies on understanding and predicting infestation risk. Previous studies have focused on D. suzukii’s host preference and fruit crop susceptibility to predict farm risk, while few studies have examined the relative role of landscape. The am...

Host plant resistance, an important strategy of Integrated Pest Management, was examined in the American Cranberry, Vaccinium macrocarpon Ait. (Ericaceae). This study assessed field population densities of the three most economically important pest species in Wisconsin: blackheaded fireworm, Rhopobota naevana (Hübner) (Lepidoptera: Tortricidae), sp...

We investigated the effect of mating on female attractiveness and male responsiveness in the potato psyllid, Bactericera (= Paratrioza) cockerelli (Šulc) (Hemiptera: Triozidae), a major pest of potato. Assays were designed to examine response by mated or virgin males to volatile odors produced by virgin or mated females. Mating induced a behavioral...

In-nest observations of the solitary bee, Megachile rotundata (F.), revealed that nesting females apply olfactory cues to nests for nest recognition. On their way in and out of the nest, females drag the abdomen along the entire length of the nest, and sometimes deposit fluid droplets from the tip of the abdomen. The removal of bee-marked sections...

The potato psyllid, Bactericera (= Paratrioza) cockerelli (Sulc) (Hemiptera: Triozidae), is a major pest of potato. Studies were conducted to determine the age at which both males and females reach reproductive maturity and the effect of age and time of day on sex attraction. Adult B. cockerelli reach reproductive maturity within 48 h post-eclosion...

Traps baited with sex pheromone lures for the noctuid moths Chrysodeixis chalcites (Esper) and Feltia jaculifera (Guenée) captured males of the confamilial moth Fishia yosemitae (Grote). These lures were a mixture of (Z)-7-dodecenyl acetate (Z7-12Ac) and (Z)-9-tetradecenyl acetate (Z9-14Ac). When these chemicals were tested as lures in traps, separ...