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Fig. 2. Linear regression models showing the relationship between Aphis citricola and Harmonia axyridis abundance. A in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 2. Linear regression models showing the relationship between Aphis citricola and Harmonia axyridis abundance. A: Catnip (Nepeta cataria) + French marigold (Tagetes patula), B: ageratum (Ageratum houstonianum) + French marigold, C: catnip + ageratum, and D: native vegetation.

Fig. 6 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 6. Typical chromatograms obtained from headspace collections of volatiles from French marigold (Tagetes patula) (B) and catnip (Nepeta cataria) (C). A, air control.

Fig. 9 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 9. An Aphis citricola infestation model showing the effects of aromatic plant volatiles. Solid arrows refer to positive effects. Dotted lines refer to negative effect. The thickness of the arrows indicates the magnitude of the effects. The model includes data from this study and the studies by Song et al. (2013) and Chen et al (2014).

Fig. 8 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 8. Response of Harmonia axyridis adults to 12.5 μL/L, 25 μL/L, and 50 μL/L 1:1 mixed D-limonene and terpinolene afer 60 min. A: No aphids; B: aphids present. The numbers of asterisks represent the level of significance: ** highly significant (P <0.01); * significant (P <0.05); n.s. no significant difference.

Fig. 5 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 5. Differences in the number of Harmonia axyridis adults responding to French marigold (Tagetes patula) (A) and catbip (Nepeta cataria) (B) afer 60 min. T: Apple trees + aromatic plants; CK: apple trees. Aphids removed: aphids introduced for 2 h and then removed. The numbers of asterisks represent the level of significance: * significant (P <0.05); n.s. no significant difference.

Fig. 7 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 7. Differences in the number Harmonia axyridis adults in response to 12.5 μL/L, 25 μL/L, and 50 μL/L D-limonene (A, B) and terpinolene (C, D) afer 60 min. A, C: No aphids;B, D: aphids present.The numbers of asterisks represent the level of significance:** highly significant (P <0.01);* significant (P <0.05);n.s. no significant difference.

Fig. 3 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 3. Linear regression models showing the relationship in the ratio of Harmonia axyridis abundance to Aphis citricola abundance with sampling years. A: Catnip (Nepeta cataria) + French marigold (Tagetes patula), B: ageratum (Ageratum houstonianum) + French marigold, C: catnip + ageratum, and D: native vegetation.

opencc-zeroDec 2019View details →

Data from: Spatial scale, neighbouring plants and variation in plant volatiles interactively determine the strength of host-parasitoid relationships

Species-specific responses to the environment can moderate the strength of interactions between plants, herbivores and parasitoids. However, the ways in which characteristics of plants, such as genotypic variation in herbivore induced volatiles (HIPVs) that attract parasitoids, affect trophic interactions in different contexts of plant patch size and plant neighbourhood is not well understood. We conducted a factorial field experiment with white cabbage (Brassica oleracea) accessions that differ in the attractiveness of their HIPVs for parasitoids, in the context of different patch sizes and presence or absence of surrounding Brassica nigra plants. Parasitism rates of experimentally introduced Pieris brassicae caterpillars and the presence of naturally occurring Pieris spp. caterpillars in the plots were assessed throughout the growing season. The abundance of Pieris caterpillars was neither affected by cabbage accession nor plot size. Later in the season, when B. nigra plants had senesced, fewer caterpillars were found on cabbage plants in plots with a B. nigra border. Parasitism rates fluctuated over the season, and were not affected by plot size. However, the B. nigra border negatively affected parasitism rates on the accession that is less attractive to the parasitoid Cotesia glomerata, but not on the more attractive accession. Our results show that plant variation in HIPVs can differentially influence herbivores and parasitoids depending on characteristics of the surrounding vegetation context. These findings underscore the importance of considering the interaction between focal plant traits and neighbourhood context to reliably predict trophic cascades.

opencc-zeroJan 2021View details →

Impact of Helicoverpa zea salivary GOX on stomatal conductance and volatile emission of host plants

This data set contain raw data associated with the manuscript titled "Silencing the alarm: An insect salivary enzyme closes plant stomata and inhibits volatile release". Herbivore-induced plant volatiles (HIPVs) are widely recognized as ecologically important to plant. While the majority of studies focused on the induction of this "cry for help", little is known about whether insect herbivores have evolved mechanisms to reduce the release of HIPVs. Here we show that a caterpillar (Helicoverpa zea) salivary enzyme, glucose oxidase (GOX), commonly secreted on plant leaves causes stomatal closure and reductions in emissions of several HIPVs involved in plant defenses. We found that application of GOX to wounded regions of leaves led to reductions in stomatal conductance on tomato (Solanum lycopersicum) and soybean (Glycine max) for at least two days. The role of GOX in reducing stomatal aperture was confirmed using GOX knockout lines of H. zea (CRISPR-Cas9 mutagenesis), and microscopic observations of stomata. In addition, GOX reduced the emission of several HIPVs during feeding by H. zea, including (Z)-3-hexenol, (Z)-jasmone, and (Z)-3-hexenyl acetate, which are important air borne signals in plant defenses. Our findings highlight a novel mechanism where insect herbivore reduces the release of HIPVs during feeding by targeting fundamental plant structure (i.e. stomata), and the link between of stomatal dynamics and releases of HIPVs. We demonstrate the existence of HIPVs-interfering mechanisms as a potential evolutionary strategy for insect herbivores to interfere with plant air borne signals.

publicJul 2020View details →

Data from: Spatial scale, neighbouring plants and variation in plant volatiles interactively determine the strength of host-parasitoid relationships

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publicJan 2021View details →

Impact of Helicoverpa zea salivary GOX on stomatal conductance and volatile emission of host plants

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publicSep 2024View details →

Data from: Host egg volatiles are involved in brood parasitism in predatory mites

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opencc-zeroDec 2016View details →

Data from: Gypsy moth herbivory induced volatiles and reduced parasite attachment to cranberry hosts

Interactions between species can have cascading effects that shape subsequent interactions. For example, herbivory can induce plant defenses that affect subsequent interactions with herbivores, pathogens, mycorrhizae, and pollinators. Parasitic plants are present in most ecosystems, and play important roles in structuring communities. However, the effects of host herbivory on parasitic plants, and the potential mechanisms underlying such effects, are not well known. We conducted a greenhouse study to ask whether gypsy moth (Lymantria dispar) damage, host cultivar, and their interaction affected preference of the stem parasite dodder (Cuscuta spp.) on cranberry hosts (Vaccinium macrocarpum). We then assessed the mechanisms that could underlie such effects by measuring induced changes in phytohormones and secondary compounds. We found that damage by gypsy moths delayed dodder attachment by approximately 0.3 days when dodder stems were added 2 days after damage, and reduced attachment by more than 50% when dodder stems were added 1 week after host plant damage. Gypsy moth damage significantly increased jasmonic acid (JA) levels, total volatile emissions, and the flavonol, quercetin aglycone, suggesting possible mechanisms underlying variation in dodder ability to locate or attach to hosts. Dodder preference also differed between cranberry cultivars, with the highest attachment on the cultivar that had significantly lower levels of total volatile emissions and total phenolic acids, suggesting that volatile composition and phenolics may mediate dodder preference. Our results indicate that herbivory can reduce subsequent attachment by a highly damaging parasitic plant, demonstrating the potential importance of early damage for shaping subsequent species interactions.

opencc-zeroMar 2022View details →

Tri-trophic interactions with avian predators: the effect of host plant species and herbivore-induced plant volatiles on recruiting avian predators

<div> Herbivore-induced plant volatiles (HIPVs) are important signaling compounds released by plants upon wounding. These compounds have been shown to mediate tri-trophic interactions in recruiting insect predators and parasitoids. Recent work has begun to show that avian species, which were once thought to have a very limited sense of smell, can cue in on these HIPVs to find insect prey. Here, we test the ability for two general HIPVs, methyl jasmonate and methyl salicylate, to recruit avian predators. We test the recruitment efficacies of these HIPVs across 4 different host plant species (black walnut, red maple, cattail, and wheat) and use clay caterpillars to quantify predation by insectivorous birds. We found no significant differences in predation between treatment groups across any of our host plants. However, there was a nearly-significant effect of methyl salicylate in black-walnut trees. Interestingly, our results did show a significant effect of host plant species on predation levels. The two tree species, particularly black walnut, had higher levels of predation than the herbaceous species. We discuss the implications of these results and suggest a number of ideas and suggestions for future studies investigating the role of HIPVs in attracting insectivorous birds. </div>

publicMar 2022View details →

Tri-trophic interactions with avian predators: the effect of host plant species and herbivore-induced plant volatiles on recruiting avian predators

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publicJul 2018View details →

Data from: Gypsy moth herbivory induced volatiles and reduced parasite attachment to cranberry hosts

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Data from: Selection by parasitoid females among closely related hosts based on volatiles: Identifying relevant chemical cues

Parasitoid fitness is influenced by the ability to overcome host defense strategies and by the ability of parasitoid females to select high-quality host individuals. When females are unable to differentiate among hosts, their fitness will decrease with an increasing abundance of resistant hosts. To understand the effect of mixed host populations on female fitness, it is therefore necessary to investigate the ability of female parasitoids to select among hosts. Here, we used behavioral assays, headspace volatile collection, and electrophysiology to study the ability of Asecodes parviclava to use olfactory cues to select between a susceptible host (Galerucella calmariensis) and a resistant host (Galerucella pusilla) from a distance. Our studies show that parasitoid females have the capacity to distinguish the two hosts and that the selection behavior is acquired through experiences during earlier life stages. Further, we identified two volatiles (α-terpinolene and [E]-β-ocimene) which amounts differ between the two plant–herbivore systems and that caused behavioral and electrophysiological responses. The consequence of this selection behavior is that females have the capacity to avoid laying eggs in G. pusilla, where the egg mortality is higher due to much stronger immune responses toward A. parviclava than in larvae of G. calmariensis.

opencc-zeroDec 2017View details →

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Fig. 1 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 1. Total numbers of Aphis citricola (A) and Harmonia axyridis (B) individuals from 2012 to 2015 in relation to ground cover vegetation. C + FM: catnip (Nepeta cataria) + French marigold (Tagetes patula), A + FM: ageratum (Ageratum houstonianum) + French marigold, C + A: catnip + ageratum; CK: native vegetation.

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Fig. 4 in Behavioral responses of Aphis citricola (Hemiptera: Aphididae) and its natural enemy Harmonia axyridis (Coleoptera: Coccinellidae) to non-host plant volatiles

Fig. 4. Response of Aphis citricola adults to French marigold (Tagetes patula) (A) and catnip (Nepeta cataria) (B). T: Apple trees + aromatic plants; CK: apple trees only. The numbers of asterisks represent the level of significance: ** highly significant (P <0.01); * significant difference (P <0.05).