Host-plant green-leaf volatiles synergize the synthetic sex pheromones of the corn earworm and codling moth (Lepidoptera)

Chemoecology ◽  
1993 ◽  
Vol 4 (3-4) ◽  
pp. 145-152 ◽  
Author(s):  
Douglas M. Light ◽  
Robert A. Flath ◽  
Ronald G. Buttery ◽  
Frank G. Zalom ◽  
Richard E. Rice ◽  
...  
eLife ◽  
2013 ◽  
Vol 2 ◽  
Author(s):  
Silke Allmann ◽  
Anna Späthe ◽  
Sonja Bisch-Knaden ◽  
Mario Kallenbach ◽  
Andreas Reinecke ◽  
...  

The ability to decrypt volatile plant signals is essential if herbivorous insects are to optimize their choice of host plants for their offspring. Green leaf volatiles (GLVs) constitute a widespread group of defensive plant volatiles that convey a herbivory-specific message via their isomeric composition: feeding of the tobacco hornworm Manduca sexta converts (Z)-3- to (E)-2-GLVs thereby attracting predatory insects. Here we show that this isomer-coded message is monitored by ovipositing M. sexta females. We detected the isomeric shift in the host plant Datura wrightii and performed functional imaging in the primary olfactory center of M. sexta females with GLV structural isomers. We identified two isomer-specific regions responding to either (Z)-3- or (E)-2-hexenyl acetate. Field experiments demonstrated that ovipositing Manduca moths preferred (Z)-3-perfumed D. wrightii over (E)-2-perfumed plants. These results show that (E)-2-GLVs and/or specific (Z)-3/(E)-2-ratios provide information regarding host plant attack by conspecifics that ovipositing hawkmoths use for host plant selection.


2013 ◽  
Vol 37 (3) ◽  
pp. 268-275
Author(s):  
Hai-Feng SUN ◽  
Zhen-Yu LI ◽  
Bin WU ◽  
Xue-Mei QIN

Author(s):  
Etienne Cardinal ◽  
Brenda Shepherd ◽  
Jodie Krakowski ◽  
Carl James Schwarz ◽  
John Stirrett-Wood

This is the first study testing effectiveness of semiochemical treatments to protect individual trees from a range-expanding mountain pine beetle (MPB, Dendroctonus ponderosae Hopkins) attack into newly exposed host populations of endangered whitebark pine (Pinus albicaulis Engelmann). We investigated the effectiveness of a combination of verbenone and Green-Leaf Volatiles (GLV) to protect rare and valuable disease-resistant trees during a MPB epidemic from 2015 to 2018 in Jasper National Park, Canada. Treatments reduced the proportion of trees attacked by MPB for all diameter classes, across all stands, from 46 to 60%. We also evaluated the effect of the exotic disease white pine blister rust (caused by the fungus Cronartium ribicola J.C. Fisch), the species’ other main regional threat. MPB were less likely to attack large, rust infected trees than healthy trees, emphasizing the value of the semiochemical treatment. Protecting large, cone-bearing disease-resistant whitebark pine trees is fundamental to whitebark pine recovery. Maintaining reproductive trees on the landscape increases the frequency and diversity of rust-resistant genotypes more effectively than just planting seedlings to replace MPB-killed trees, because this slow-growing species takes over 80 years to reproduce. Our study confirmed protecting large rust-resistant trees with verbenone and GLV is a proactive and effective treatment against MPB for whitebark pine in naïve populations.


2003 ◽  
Vol 93 (4) ◽  
pp. 335-342 ◽  
Author(s):  
D. Natale ◽  
L. Mattiacci ◽  
A. Hern ◽  
E. Pasqualini ◽  
S. Dorn

AbstractPeach shoot volatiles were attractive to mated female oriental fruit moth, Cydia molesta (Busck), in a dual choice arena. No preference was observed between leaf odours from the principle host plant, peach, and the secondary host plant, apple. Twenty-two compounds were identified in headspace volatiles of peach shoots using gas chromatography–mass spectrometry. Green leaf volatiles accounted for more than 50% of the total emitted volatiles. A bioassay-assisted fractionation using different sorbent polymers indicated an attractant effect of compounds with a chain length of 6–8 carbon atoms. The major compounds of this fraction were tested either singly or in combinations for behavioural response of females. Significant bioactivity was found for a three-component mixture of (Z)-3-hexen-1-yl acetate, (Z)-3-hexen-1-ol and benzaldehyde in a 4:1:1 ratio. This synthetic mixture elicited a similar attractant effect as the full natural blend from peach shoots as well as the bioactive fraction.


The Analyst ◽  
2012 ◽  
Vol 137 (13) ◽  
pp. 3138 ◽  
Author(s):  
Yogeswaran Umasankar ◽  
Glen C. Rains ◽  
Ramaraja P. Ramasamy

2020 ◽  
Vol 174 ◽  
pp. 112334 ◽  
Author(s):  
Yongming He ◽  
Eli J. Borrego ◽  
Zachary Gorman ◽  
Pei-Cheng Huang ◽  
Michael V. Kolomiets

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