Attack and aggregation of a major squash pest: Parsing the role of plant chemistry and beetle pheromones across spatial scales

Brzozowski, Lauren J.; Gardner, Jeffrey; Hoffmann, Michael P.; Kessler, André; Agrawal, Anurag A.; Mazourek, Michael

doi:10.1111/1365-2664.13689

Cited by 10 publications

(13 citation statements)

References 43 publications

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“…Prior to collections, we caged either 4 fifth-instar saltmarsh caterpillars (n = 5) , 14 fourth-instar squash bug nymphs (n = 5), or 5 adult cucumber beetles (n = 5) on treatment plants, while control plants (n = 4–5) remained undamaged. The number and developmental stage of each species was selected based on availability and field-relevant herbivore abundances (Singer et al 2004 ; Mauck et al 2010b ; Brzozowski et al 2020 ). Saltmarsh caterpillars and cucumber beetles fed for 24 h and squash bugs fed for 48 h prior to collections (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Many domesticated cucurbit varieties, however, lost the ability to produce cucurbitacins or produce only low levels (Theis et al 2014 ; Brzozowski et al 2019 ), and recent studies have implicated plant volatiles as important chemical cues in cucurbit-herbivore interactions (Shaprio and Mauck 2018 ). Indeed, cucurbit volatiles play key roles in herbivore host-plant selection (Brzozowski et al 2020 ), plant disease transmission by vector herbivores (Mauck et al 2010a ), and natural enemy attraction to host plants to kill herbivores (Agrawal et al 2002 ; Grunseich et al 2020 ). Nevertheless, few studies have characterized beetle-induced HIPVs in zucchini squash (Brzozowski et al 2020 ) and none have examined squash bug- or saltmarsh caterpillar-induced HIPVs in zucchini squash.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, cucurbit volatiles play key roles in herbivore host-plant selection (Brzozowski et al 2020 ), plant disease transmission by vector herbivores (Mauck et al 2010a ), and natural enemy attraction to host plants to kill herbivores (Agrawal et al 2002 ; Grunseich et al 2020 ). Nevertheless, few studies have characterized beetle-induced HIPVs in zucchini squash (Brzozowski et al 2020 ) and none have examined squash bug- or saltmarsh caterpillar-induced HIPVs in zucchini squash. Further, whether HIPV-mediated interplant communication occurs in Cucurbitaceae remains an unexplored question, which could elucidate critical information for agroecological interactions between plants and herbivores.…”

Section: Introductionmentioning

confidence: 99%

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Defense Suppression through Interplant Communication Depends on the Attacking Herbivore Species

2021

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In response to herbivory, plants emit volatile compounds that play important roles in plant defense. Herbivore-induced plant volatiles (HIPVs) can deter herbivores, recruit natural enemies, and warn other plants of possible herbivore attack. Following HIPV detection, neighboring plants often respond by enhancing their anti-herbivore defenses, but a recent study found that herbivores can manipulate HIPV-interplant communication for their own benefit and suppress defenses in neighboring plants. Herbivores induce species-specific blends of HIPVs and how these different blends affect the specificity of plant defense responses remains unclear. Here we assessed how HIPVs from zucchini plants (Cucurbita pepo) challenged with different herbivore species affect resistance in neighboring plants. Volatile “emitter” plants were damaged by one of three herbivore species: saltmarsh caterpillars (Estigmene acrea), squash bugs (Anasa tristis), or striped cucumber beetles (Acalymma vittatum), or were left as undamaged controls. Neighboring “receiver” plants were exposed to HIPVs or control volatiles and then challenged by the associated herbivore species. As measures of plant resistance, we quantified herbivore feeding damage and defense-related phytohormones in receivers. We found that the three herbivore species induced different HIPV blends from squash plants. HIPVs induced by saltmarsh caterpillars suppressed defenses in receivers, leading to greater herbivory and lower defense induction compared to controls. In contrast, HIPVs induced by cucumber beetles and squash bugs did not affect plant resistance to subsequent herbivory in receivers. Our study shows that herbivore species identity affects volatile-mediated interplant communication in zucchini, revealing a new example of herbivore defense suppression through volatile cues.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Defense Suppression through Interplant Communication Depends on the Attacking Herbivore Species

2021

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“…SCB are highly destructive pests that feed above-and below-ground in larval and adult stages, respectively, use an aggregation pheromone (vittatalactone) to increase congregation onto their host plant (Smyth and Hoffmann 2003;Morris et al 2005), and can phytophagously vector Erwinia tracheiphila, the pathogen cause of bacterial wilt (Reviewed in Rojas et al 2015). SCB are obligate herbivores to cucurbits and as a consequence their behavior and biology are strongly influenced by cucurbit chemistry including secondary defense metabolites, blossom volatiles, and foliar volatiles (Metcalf et al 1980;Lewis et al 1990;Metcalf et al 1995;Andrews et al 2007;Shapiro et al 2012;Theis et al 2014;Brzozowski et al 2020).…”

Section: The System: a Brief Overviewmentioning

confidence: 99%

“…Despite these abundant and diverse interactions, some substances are repeatedly used as an important chemical signal between and across multiple organisms (Raguso 2016). Investigating how semiochemicals have wide effects and influence a community of organisms, including target and nontarget receivers, have remained of interest especially against the backdrop of agroecosystems (Theis et al 2009;Mallinger et al 2011;Barber et al 2012;Shapiro et al 2012;Theis and Adler 2012;Theis et al 2014; Reviewed in Raguso et al 2015;Brzozowski et al 2016;Filgueiras et al 2016;Davis et al 2019;Helms et al 2019;Brzozowski et al 2020). And since many chemical ecologists and applied entomologist share broad and overlapping interests coalescing on one system could allow for a deeper understanding of plant-insect interactions, especially if that system could combine the elements of plant-herbivore, plant-predator, and plant-pollinator interactions into one.…”

Section: Introduction: Why Coalesce On a System?mentioning

confidence: 99%

Using Cucumis sativus, Acalymma vittatum, Celatoria setosa, and generalist pollinators as a case study for plant–insect interactions

Barrett

Filgueiras

Willett

2021

Arthropod-Plant Interactions

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Showcasing how semiochemicals are both multifunctional and can influence a community of organisms is a constant frontier shared by chemical ecologists and applied entomologists alike. As researchers in these fields continue to share broad and overlapping interests, converging on one system could allow for a better understanding of community interactions and the chemical substances that mediate them. Cucurbit systems are strategically positioned to study these types of interactions because they combine the elements of plant–herbivore, plant–predator, and plant pollinator into one model and are systems where researchers can pursue both basic and applied questions. In this review, we propose Cucumis sativus [cucumber], Acalymma vittatum [striped cucumber beetle], Celatoria setosa [a natural enemy], and generalist pollinators as a system for continued investigation into semiochemicals, their multifunctional roles, and their influence on both target and nontarget organisms. We believe this system is ripe for further exploration at the frontiers in chemical ecology and applied entomology.

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Deconstructing insect herbivore trivial movement in a monoculture and triculture: Limitations of emigration

Andow

2023

Population Ecology

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Significantly higher population densities of a squash pest beetle, Acalymma vittatum, were observed in a squash monoculture than a triculture of squash, maize, and beans. One hypothesis for such differences is that non-host plants in the triculture cause the herbivore to move more frequently resulting in higher emigration rates from the tricultures. Plant to plant movement of the beetle was studied in vegetative winter squash to evaluate if differences in components of trivial movement would generate a higher emigration rate from the triculture. Tenure times were shorter on plants in the triculture than on plants in the squash monoculture, there was no movement directionality, movement distances were greater in squash monocultures than in tricultures and were greater during July than August. In the tricultures, plant-to-plant transitions were primarily to maize from non-host plants and to beans or squash from host plants during July, but during August, movement from any plant was primarily to maize. We integrated the values of the movement components from vegetative winter squash into a simple Markov model, and found that during July, emigration was estimated to be faster from the triculture than the monoculture, supporting the hypothesis. However, in August, emigration was estimated to be slower from the triculture. In August, maize plants were tall and, by acting like a fence, greatly reduced the movement distance of beetles. The effect of the differences in emigration rate on beetle population density was greatest for small patches, indicating that emigration may be important only in small-scale production systems.

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Attack and aggregation of a major squash pest: Parsing the role of plant chemistry and beetle pheromones across spatial scales

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 10 publications

References 43 publications

Defense Suppression through Interplant Communication Depends on the Attacking Herbivore Species

Defense Suppression through Interplant Communication Depends on the Attacking Herbivore Species

Using Cucumis sativus, Acalymma vittatum, Celatoria setosa, and generalist pollinators as a case study for plant–insect interactions

Deconstructing insect herbivore trivial movement in a monoculture and triculture: Limitations of emigration

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