Agents That Can Elicit Induced Resistance

Lyon, G. D.

doi:10.1002/9780470995983.ch2

Cited by 39 publications

(3 citation statements)

References 122 publications

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“…The active components of Actigard and Employ are known to elicit plant responses by manipulating the salicylate signalling pathways. In many other plants, ASM (Actigard) ‘mimics’ salicylic acid and activates signalling cascades downstream of salicylic acid, whereas harpin protein (Employ) leads to indigenous accumulation of salicylic acid in plants (Lyon, ). The signalling pathways leading to elevated defenses following chitosan applications are unknown, but chitosan treatment elicits plant responses similar to those caused by foliar applications of salicylic acid (Mejia‐Teniente et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…The signalling pathways leading to elevated defenses following chitosan applications are unknown, but chitosan treatment elicits plant responses similar to those caused by foliar applications of salicylic acid (Mejia‐Teniente et al., ). Each of these elicitors (ASM, harpin protein, and chitosan) reportedly activates defenses against plant pathogens in numerous other plants (Lyon, ), and appears to be involved in defenses against aphids (Cooper et al., ; Dong et al., ; Cooper & Goggin, ; Boughton et al., ; Li et al., ; Gao et al., ; Zhang et al., ). Because aphids and psyllids share similar feeding mechanisms, it seems likely that the same general plant responses to elicitors that reduce aphid performance may have contributed to the observed reduction in C. pyricola performance.…”

Section: Discussionmentioning

confidence: 99%

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Effects of elicitors of host plant defenses on pear psylla, Cacopsylla pyricola

Cooper¹,

Horton²

2015

Entomologia Exp Applicata

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Pear psylla, Cacopsylla pyricola (Foerster) (Hemiptera: Psyllidae), is a key pest of cultivated pear [Pyrus communis L. (Rosaceae)] in North America and Europe. We examined the effects of foliar applications of three commercially available chemical elicitors of host-plant defenses -Actigard (acibenzolar-S-methyl), Employ (harpin protein), and ODC (chitosan) -on survival, development, feeding, and egg laying of C. pyricola. All three defense elicitors reduced the number of nymphs present on pear (cvs. Bartlett or D'Anjou) 30 days after releasing 10 adults on the trees. Choice assays showed that females settled and oviposited on untreated trees more often than on trees treated with any of the three defense elicitors. Results of no-choice assays confirmed that the effects of Actigard, Employ, and ODC on C. pyricola were due to activation of systemic plant responses that led to reduced oviposition preference and nymph survival. However, results did not provide evidence that plant responses to elicitors led to reduced nymphal feeding rates or development. Results of our laboratory studies suggest that commercial defense elicitors may be useful in the integrated management of pear psylla once the effects of elicitors at an ecological scale are better understood.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of elicitors of host plant defenses on pear psylla, Cacopsylla pyricola

Cooper¹,

Horton²

2015

Entomologia Exp Applicata

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“…Induced defenses rely on signaling compounds known as 'elicitors' to initiate the plant's defense response pathways. Elicitors include a wide variety of molecules, such as proteins, lipids, and carbohydrates found in various plant, microbial, and insect products (Lyon, 2007;Reignault and Walters, 2007;Meena et al, 2022). Once a plant interacts with an elicitor, one or more signal-transduction pathways are activated.…”

Section: Introductionmentioning

confidence: 99%

Elicitors of plant defenses as a standalone tactic failed to provide sufficient protection to fruits against spotted-wing drosophila

Quadrel,

Urbaneja-Bernat,

Holdcraft

et al. 2024

Front. Agron.

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Spotted-wing drosophila, Drosophila suzukii (Matsumura), is a globally important invasive pest of soft-skinned fruits including raspberries, blueberries, and strawberries. Current control measures for this pest primarily rely on calendar-based insecticide sprays; therefore, more sustainable methods are desirable. Adults of D. suzukii use cues derived from fruits and symbiotic microbes to identify optimal sites for feeding, mating, and oviposition. We hypothesized that modifying any of these cues could influence D. suzukii adult behavior, making them less likely to select suitable fruits. One approach involves applying synthetic elicitors of the salicylic acid (SA) and jasmonic acid (JA) plant defense pathways, which are associated with defenses against pathogens and herbivores, respectively, or the use of crop sterilants, employed for microbial control, to reduce D. suzukii attraction, oviposition, and larval performance in fruits. Here, the preference and performance of D. suzukii was investigated in blueberry fruits treated exogenously with four commercial elicitors of plant defenses – three that primarily activate SA-related defenses (Actigard, LifeGard, and Regalia) and one activator of JA-related defenses (Blush) – and the crop sterilant OxiDate. A series of choice and no-choice experiments were conducted in laboratory, semi-field, and field settings that were performed at various time intervals to assess the residual effects of each treatment. Our results showed no consistent repellent, oviposition deterrent, or larval toxicity activity for any of the products tested. As a result, our findings do not provide sufficient support to recommend the use of these elicitors or the crop sterilant as viable standalone options for D. suzukii management.

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Discursive Strategies of a Sociotechnical Network

2024

Pesticides

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Agents That Can Elicit Induced Resistance

Cited by 39 publications

References 122 publications

Effects of elicitors of host plant defenses on pear psylla, Cacopsylla pyricola

Effects of elicitors of host plant defenses on pear psylla, Cacopsylla pyricola

Elicitors of plant defenses as a standalone tactic failed to provide sufficient protection to fruits against spotted-wing drosophila

Discursive Strategies of a Sociotechnical Network

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