James Tumlinson

James Tumlinson
Pennsylvania State University | Penn State · Department of Entomology

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351
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Publications

Publications (351)
Article
Full-text available
Several herbivorous caterpillars contain effectors in their oral secretions that alter the emission of green leaf volatiles (GLVs) produced by the plants upon which the caterpillars are feeding. These effectors include an isomerase, a fatty acid dehydratase (FHD), and a heat-stable hexenal trapping (HALT) molecule. GLVs serve as signaling compounds...
Article
Full-text available
Key Message This review provides an overview, analysis, and reflection on insect elicitors and effectors (particularly from oral secretions) in the context of the ‘arms race’ with host plants. Abstract Following injury by an insect herbivore, plants rapidly activate induced defenses that may directly or indirectly affect the insect. Such defense p...
Article
Specific cues used by emerald ash borer (EAB, Agrilus planipennis) to select hosts are largely unknown. Attractants are likely general and the use of novel host plants provides an opportunity to investigate the commonality of these cues. We examined volatile profiles emitted by five plants that can host EAB and estimated their importance in explain...
Article
Full-text available
Plants produce species‐specific herbivore‐induced plant volatiles (HIPVs) after damage. We tested the hypothesis that herbivore‐specific HIPVs prime neighboring plants to induce defenses specific to the priming herbivore. Since Manduca sexta (specialist) and Heliothis virescens (generalist) herbivory induced unique HIPV profiles in Nicotiana bentha...
Article
Green plants emit green leaf volatiles (GLVs) as a general damage response. These compounds act as signals for the emitter plant, neighboring plants, and even for insects in the ecosystem. However, when oral secretions from certain caterpillars are applied to wounded leaves, GLV emissions are significantly decreased or modified. We examined four ca...
Article
Evidence that plants can respond to volatile organic compounds (VOCs) was first presented 35 years ago. Since then, over 40 VOCs have been found to induce plant responses. These include VOCs that are produced not only by plants, but also by microbes and insects. Here, we summarize what is known about how these VOCs are produced, and how plants dete...
Article
The last two decades have witnessed a sustained increase in the study of plant-emitted volatiles and their role in plant-insect, plant-microbe and plant-plant interactions. While each of these binary systems involves complex chemical and biochemical processes between two organisms, the progression of increasing complexity of a ternary system (i.e.,...
Article
Full-text available
Emerald ash borer (EAB; Agrilus planipennis) is a devastating pest of ash (Fraxinus spp.) in its invaded range in North America. Its coevolved Asian hosts are more resistant and less preferred for oviposition than susceptible North American species. We compared EAB oviposition preferences and bark and canopy volatile organic compound (VOC) emission...
Article
Full-text available
There has been a long-standing interest in developing approaches to maximize honey production by Kenyan beekeepers. Since honey bees in Kenya are passively managed, the main decision beekeepers make is which hive type to use: traditional Log hives, Langstroth hives, and Kenyan top-bar hives. We found Langstroth hives to be the most attractive to mi...
Article
Full-text available
Terpene volatiles produced by sweet corn (Zea mays) upon infestation with pests such as beet armyworm (Spodoptera exigua) function as part of an indirect defense mechanism by attracting parasitoid wasps; yet little is known about the impact of climate change on this form of plant defense. To investigate how a central component of climate change aff...
Article
Menthol is a vasoactive compound that is widely used in topical analgesic agents. Menthol induces cutaneous vasodilation, however the underlying mechanisms are unknown. Determining the rates of appearance and clearance of menthol in the skin is important for optimizing topical treatment formulation and dosing. The purpose of this study was to deter...
Article
Full-text available
The direct negative effects of invasive plant species on agriculture and biodiversity are well known, but their indirect effects on human health, and particularly their interactions with disease-transmitting vectors, remains poorly explored. This study sought to investigate the impact of the invasive Neotropical weed Parthenium hysterophorus and it...
Article
Main conclusion: Of the three functional FPPS identified in maize, fpps3 is induced by herbivory to produce FDP important for the formation of the volatile sesquiterpenes of plant defense. Sesquiterpenes are not only crucial for the growth and development of a plant but also for its interaction with the environment. The biosynthesis of sesquiterpe...
Article
Plants attacked by insect herbivores release a blend of volatile organic compounds (VOCs) that serve as chemical cues for host location by parasitic wasps, natural enemies of the herbivores. Volicitin, N-(17-hydroxylinolenoyl)-L-glutamine, is one of the most active VOC elicitors found in herbivore regurgitants. Our previous study revealed that hydr...
Data
MS2 spectra of hydroxylinolenoyl-l-glutamine (OH-18:3-Gln) from Manduca sexta (A), Acherontia styx (B) and 17OH-volicitin from Spodoptera litura larval gut contents (C). Larval gut content of wild A. styx was prepared in the same way.
Data
GC/MS chromatogram of methyl acetoxylinolenate (M + 1-CH3COOH, m/z 291) derived from (A) 17OH-volicitin purified from Spodoptera litura larval gut contents, (B) 18OH-volicitin from Manduca sexta, and (C) synthesized 18OH-volicitin.
Article
Full-text available
In East Africa, honey bees (Apis mellifera) provide critical pollination services and income for small-holder farmers and rural families. While honey bee populations in North America and Europe are in decline, little is known about the status of honey bee populations in Africa. We initiated a nationwide survey encompassing 24 locations across Kenya...
Article
Maize seedlings emit sesquiterpenes during the day in response to insect herbivory. Parasitoids and predators use induced volatile blends to find their hosts or prey. To investigate the diurnal regulation of biosynthesis and emission of induced sesquiterpenes we applied linolenoyl-L-glutamine (LG) to maize seedlings in the morning or evening using...
Article
Full-text available
Fatty acid amino acid conjugates (FACs), first identified in lepidopteran caterpillar spit as elicitors of plant volatile emission, also have been reported as major components in gut tracts of Drosophila melanogaster and cricket Teleogryllus taiwanemma. The profile of FAC analogs in these two insects was similar to that of tobacco hornworm Manduca...
Article
Plasmodium parasites are known to manipulate the behavior of their vectors so as to enhance transmission [1-4]. From an evolutionary standpoint, behavior manipulation by the parasite should expose the vector to limited risk of early mortality while ensuring sufficient energy supply for both it and the vector [5, 6]. However, it is unknown whether t...
Article
Herbivores elicit a complex indirect and direct defense response in plants, but little is known about how defenses are expressed throughout a plant's life cycle. Here we report the characterization of direct and indirect defense profiles for two vegetative stages of maize, v1 and v3. Indirect defense expression was evaluated by measuring plant head...
Article
Plants respond to insect herbivory by ramping up the production of defence-related jasmonic acid (JA). The pea aphid, Acyrthosiphon pisum, is able to avoid triggering JA as it feeds. The aim of our study was to examine whether or not aphids simply avoid triggering plant defence signalling or whether they are able to manipulate plant signalling in a...
Article
Full-text available
Trap cropping and biological control can provide a sustainable means of controlling insect pests. Insects in the genus Lygus (Hemiptera: Miridae) are major pests on cotton and horticultural crops throughout the United States, and pesticide resistance within Lygus populations necessitates more sustainable long-term management techniques. Here, we ex...
Article
Full-text available
Using sticky traps, we compared the efficacy of chemical and visual lures, both alone and in combination, for improving the detection of populations of the emerald ash borer (EAB), Agrilus planipennis. Ash leaflets to which EAB visual decoys were pinned and coated with sticky material were able to trap EAB with as high a rate of detection as large...
Conference Paper
Hemipteran insects are understudied in terms of their chemical ecology even though many Hemipterans are major insect pests in agricultural ecosystems. A greater understanding of chemical cues that mediate interactions among host plants, Hemipterans, and their natural enemies would benefit control efforts. A common field edge weed, Erigeron annuus,...
Conference Paper
Honey bees (Apis mellifera L.) are frequently exposed to pesticides both within the hive and while foraging. The magnitude of impact from pesticide exposure on honey bee queen chemistry, pheromone-mediated queen-worker interactions and worker gene expression is relatively unknown. In our study, we examined the role of commonly encountered pesticide...
Article
Full-text available
Background Sugar feeding is critical for survival of malaria vectors and, although discriminative plant feeding previously has been shown to occur in Anopheles gambiae s.s., little is known about the cues mediating attraction to these plants. In this study, we investigated the role of olfaction in An. gambiae discriminative feeding behaviour. Meth...
Data
Full-text available
Olfactometer release rates of synthetic standards Olfactometer release rates for optimal doses of individual EAD-active synthetic standards.
Data
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Olfactometer release rates of blend components Olfactometer release rates of EAD-active synthetic components of blend A, B and C.
Article
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Insect herbivores often induce plant volatile compounds that can attract natural enemies. Cotesia marginiventris (Hymenoptera: Braconidae) is a generalist parasitoid wasp of noctuid caterpillars and is highly attracted to Spodoptera exigua-induced plant volatiles. The plasticity of C. marginiventris associative learning to volatile blends of variou...
Article
Fatty acid amino acid conjugates (FACs) in the oral secretions of Lepidopteran larvae are responsible for eliciting plant defense responses. FACs are present despite fitness costs which suggests that they are important for larval survival. In previous work, an aminoacylase (L-ACY-1) was identified as the enzyme responsible for hydrolysis of FACs wi...
Article
Full-text available
Sirex noctilio females are known to be attracted to stem sections of stressed pine trees for oviposition. The volatile profiles and attractiveness of Eastern white pine (Pinus strobus) and two chemotypes of Scots pine (P. sylvestris) were compared after stem injection with herbicide. In general, trap captures on herbicide-treated trees were higher...
Article
Full-text available
A male-produced pheromone that attracts both males and females was identified for the European woodwasp, Sirex noctilio, a serious pest of pine trees. Males displayed excitatory behaviors when placed in groups, and were attracted to the odors from males that were 2-5-d-old, but not to odors from males that were 0-1-d-old. An unsaturated short-chain...
Conference Paper
Fatty acid amino acid conjugates (FACs) have been identified in Lepidopteran larvae as elicitors of plant defense. Plant responses include the production of primary defense compounds and induction of secondary defense strategies including attraction of parasitoid wasps. These elicitors are present despite fitness costs, suggesting that they are imp...
Conference Paper
Generalist and Hemipteran insects are both understudied in terms of their chemical ecology even though many Hemipterans are major insect pests in agricultural ecosystems. A greater understanding of chemical cues that mediate interactions among host plants, Hemipterans, and their natural enemies would benefit control efforts. A common field edge wee...
Article
Fatty acid-amino acid conjugates (FACs) have been identified in Lepidopteran larvae as elicitors of plant defenses. Plant responses include the production of primary defense compounds and induction of secondary defense strategies including attraction of parasitoid wasps. These elicitors are present despite fitness costs, suggesting that they are im...
Chapter
Full-text available
The recent detection of an established Sirex noctilio F. (Hymenoptera: Siricidae) population in New York, USA highlighted an urgent need to develop a trapping system so that the wasp’s distribution and density can be monitored effectively. This review is of research that has been done on the insect’s biology and chemical ecology towards this goal....
Article
Full-text available
Nous étudions le comportement de recherche de partenaire chez Agrilus subcinctus Gory et A grilus cyanescens Ratzeburg (Coleoptera : Buprestidae) dans des peuplements de frênes (Fraxinus L. (Oleaceae)) dans la région des Grands Lacs aux États-Unis. Nous avons fixé des spécimens morts des deux espèces à du feuillage de frênes pour servir de modèles...
Article
Plants defend themselves against herbivory through several means, including the production of airborne volatile organic compounds (VOCs). These VOCs benefit plants by attracting natural enemies of their herbivores. The pea aphid, Acyrthosiphon pisum, is able to feed on its host plant, Vicia faba, without inducing detectable changes in plant VOC emi...
Conference Paper
Insect herbivores often induce plant volatile compounds that can attract natural enemies. Cotesia marginiventris (Hymenoptera: Braconidae) is a generalist parasitoid wasp of Noctuid caterpillars and is highly attracted to Spodoptera exigua-induced plant volatiles. The plasticity of C. marginiventris associative learning to volatile blends of variou...
Conference Paper
Honey bees Apis mellifera L. are frequently exposed to the miticides coumaphos and tau-fluvalinate, commonly used for varroa mite control, in the hive. These miticide residues are slow to break down and persist within the hive for several years. The sub-lethal impact of coumaphos and tau-fluvalinate on honey bee health is unclear. In our study, we...
Article
N-Linolenoyl-L-glutamine is one of several structurally similar fatty acid-amino acid conjugate (FAC) elicitors found in the oral secretions of Lepidopterous caterpillars and its biosynthesis is catalyzed by membrane-associated alimentary tissue enzyme(s). FAC elicitors comprise 17-hydroxylated or non-hydroxylated linolenic acid coupled with L-glut...
Conference Paper
Background/Question/Methods Plants are able to defend themselves against herbivory through several means, including the production of airborne volatile organic compounds (VOCs). These VOCs benefit plants by attracting natural enemies of their herbivores. In addition to airborne VOC signals that are dispersed into the environment, plants also respon...
Conference Paper
Background/Question/Methods Both generalist and Hemipteran insects are understudied in terms of their chemical ecology even though many are major agricultural pests. A greater understanding of chemical cues that mediate interactions among plants, Hemipterans, and their natural enemies would contribute to a basic understanding of plant-insect intera...
Article
Full-text available
This study was conducted to determine if constitutive levels of jasmonic acid (JA) and other octadecanoid compounds were elevated prior to herbivory in a maize genotype with documented resistance to fall armyworm (Spodoptera frugiperda) and other lepidopteran pests. The resistant inbred Mp708 had approximately 3-fold higher levels of jasmonic acid...
Article
Full-text available
Fatty acid amino acid conjugates (FACs) have been found in noctuid as well as sphingid caterpillar oral secretions; in particular, volicitin [N-(17-hydroxylinolenoyl)-L-glutamine] and its biochemical precursor, N-linolenoyl-L-glutamine, are known elicitors of induced volatile emissions in corn plants. These induced volatiles, in turn, attract natur...
Conference Paper
Priming potentially alters the dynamic of plant-herbivore interactions. Rather than a static plant with induced defenses upon herbivory, a pseudo-induction may precede herbivore damage via an intra- or interplant signaling system. This may provide the plant with a strategy to pre-arm itself before herbivore infestation. Priming occurs when an undam...
Conference Paper
Several fatty-acid amide compounds (FACs) in caterpillar oral secretions enhance plant defense responses during herbivory. The most common FACs contain a fatty acid moiety either linolenic or linolenic acids that is obtained from the plant, while the amino acid moiety is almost exclusively endogenous glutamine. The levels of these FAC elicitors wit...
Article
Full-text available
In choice tests, beet armyworm (BAW), Spodoptera exigua, larvae feed preferentially on leaves from peanut plants, Arachis hypogaea L., previously infected by the white mold fungus, Sclerotium rolfsii Saccodes (mitosporic fungi) (Cardoza et al. 2002). In this study we determined that third instar BAW caterpillars allowed to feed on S. rolfsii-infect...
Article
Full-text available
A pheromone on the cuticle of females of the woodwasp Sirex noctilio, a recently introduced pest of pines in North America, induces conspecific males to attempt copulation. Dead females washed with hexane did not elicit copulation attempts from males, whereas reapplication of a female hexane body wash onto the cuticle of dead females elicited copul...
Article
Full-text available
Social insects that live in large colonies are vulnerable to disease transmission due to relatively high genetic relatedness among individuals and high rates of contact within and across generations. While individual insects rely on innate immune responses, groups of individuals also have evolved social immunity. Hygienic behavior, in which individ...
Article
In tests on Rhagoletis pomonella flies, we compared previously-reported laboratory approaches used in assaying behavioral responses of tephritid flies to host marking pheromone with new approaches described here. The foremost criterion used in choosing the most effective assay approach was that of a very high degree of fly discrimination between ph...
Article
Full-text available
The cuticular hydrocarbon profiles of emerald ash borers, Agrilus planipennis, were examined to determine if there are differences in these compounds between the sexes. We also assessed feral male EAB in the field for behavioral changes based on the application of a female-specific compound to dead, solvent-washed beetles. Males in the field spent...
Article
Full-text available
In response to insect attack, many plants exhibit dynamic biochemical changes, resulting in the induced production of direct and indirect defenses. Elicitors present in herbivore oral secretions are believed to positively regulate many inducible plant defenses; however, little is known about the specificity of elicitor recognition in plants. To inv...
Conference Paper
C. marginiventris is a generalist parasitoid wasp of Noctuid caterpillars and an effective biological control agent. It has been reported that one of its hosts, T. ni, is more heavily parasitized while in the presence of another host, S. exigua. The attraction of C. marginiventris to S. exigua via herbivore induced plant volatiles has been widely d...
Conference Paper
The tarnished plant bug, Lygus lineolaris is an important generalist Hemipteran pest in a number of fruit and agricultural systems. Both generalist insects and Hemipiterans are understudied in terms of their chemical ecology, and a greater understanding of L. lineolaris would benefit biological control efforts and contribute to basic knowledge of p...