scholarly journals Effect of host instar on host discrimination of heterospecific-parasitised hosts by sympatric parasitoids

2017 ◽  
Vol 43 (2) ◽  
pp. 137-145
Author(s):  
RUTH CEBOLLA ◽  
PABLO BRU ◽  
ALBERTO URBANEJA ◽  
ALEJANDRO TENA
Keyword(s):  
Host Discrimination ◽  
Host Instar

scholarly journals Volatile metabolites of willows determining host discrimination by adult Plagiodera versicolora

2021 ◽  
Author(s):  
Jiahao Ling ◽  
Xiaoping Li ◽  
Guo Yang ◽  
Tongming Yin
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Insect Pests ◽  
Leaf Beetle ◽  
Gas Chromatography Mass Spectrometry ◽  
Host Discrimination ◽  
Plagiodera Versicolora ◽  
Volatile Metabolites ◽  
Hexenyl Acetate ◽  
Volatile Organic

AbstractPlagiodera versicolora Laicharting is a highly damaging leaf beetle foraging on willow leaves. In willow germplasm collections, observation has shown that Salix suchowensis Cheng was severely foraged by this leaf beetle while Salix triandra L. was damage free or only slightly damaged. Results of olfactometer bioassays show that the headspace volatiles from leaves of S. triandra significantly repelled adult beetles, suggesting that this species produces volatile repellents against P. versicolora. S. suchowensis had no effect on the beetles. Gas chromatography-mass spectrometry was carried out to profile the headspace volatile organic compounds and 23 compounds from leaves of the alternate species in significantly different concentrations were detected. The effects of 20 chemical analogs on host discrimination were examined. Olfactory response to these chemicals showed that o-cymene, a S. suchowensis specific constituent, significantly attracted adult P. versicolora. In contrast, cis-3-hexenyl acetate, a constituent concentrated more in S. triandra than in S. suchowensis, significantly repelled beetles. Mixing o-cymene and cis-3-hexenyl acetate in comparable concentrations as in the volatiles of S. suchowensis demonstrated that the latter could mask the attracting effect of the former, causing a neutral response by adult beetles to leaves of S. suchowensis against clean air. In addition, chemical analogs have the same effect as plants when resembling volatile organic compounds in real samples. Two volatile metabolites were detected triggering host discrimination by one of the most damaging insect pests to host and non-host willows. The two metabolites are of considerable potential for use as olfactory signs in managing the beetles.

Plant-Inhabiting Ant Utilizes Chemical Cues for Host Discrimination

Biotropica ◽  
2011 ◽  
Vol 44 (2) ◽  
pp. 246-253 ◽  
Author(s):  
Tiffany L. Weir ◽  
Scott Newbold ◽  
Jorge M. Vivanco ◽  
Megan van Haren ◽  
Christopher Fritchman ◽  
...  
Keyword(s):  
Chemical Cues ◽  
Host Discrimination

scholarly journals Insects Can Count: Sensory Basis of Host Discrimination in Parasitoid Wasps Revealed

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0138045 ◽  
Author(s):  
Sara Ruschioni ◽  
Joop J. A. van Loon ◽  
Hans M. Smid ◽  
Joop C. van Lenteren
Keyword(s):  
Parasitoid Wasps ◽  
Host Discrimination

CONSPECIFIC SUPERPARASITISM IN TWO PARASITOID WASPS, APHIDIUS ERVI HALIDAY AND APHELINUS ASYCHIS WALKER: REPRODUCTIVE STRATEGIES INFLUENCE HOST DISCRIMINATION

1991 ◽  
Vol 123 (6) ◽  
pp. 1229-1237 ◽  
Author(s):  
B. Bai
Keyword(s):  
Reproductive Strategies ◽  
Acyrthosiphon Pisum ◽  
Aphidius Ervi ◽  
Parasitoid Wasps ◽  
Host Discrimination ◽  
Larval Competition ◽  
Parasitoid Species ◽  
Aphid Parasitoid ◽  
Aphelinus Asychis ◽  
Physiological Suppression

AbstractConspecific host discrimination and larval competition in two aphid parasitoid species were studied in the laboratory using the pea aphid, Acyrthosiphon pisum (Harris) (Homoptera: Aphididae), as a host. Aphidius ervi Haliday (Hymenoptera: Aphidiidae) used internal host cues to discriminate between unparasitized and conspecific parasitized hosts. When only parasitized hosts were available, females oviposited into recently parasitized ones where their progeny had a good chance to survive, but rejected those parasitized ≥24 h earlier where their offspring normally died. Competitions occurred only after both eggs had hatched. Larvae eliminated supernumeraries by means of physical combat and physiological suppression. In Aphelinus asychis Walker (Hymenoptera: Aphelinidae), factors, or changes in host internal condition, associated with hatching of the first egg resulted in suppression of conspecific competitors which could be in either larval or egg stage. The older larvae always won competitions through physiological means. A wasp’s oviposition decision is shown to be influenced by the probability of its progeny’s survival. Species that have different reproductive strategies may respond differently to identical host conditions.

How to analyse host discrimination

1978 ◽  
Vol 3 (1) ◽  
pp. 71-75 ◽  
Author(s):  
J. C. van LENTEREN ◽  
K. BAKKER ◽  
J. J. M. van ALPHEN
Keyword(s):  
Host Discrimination

Host discrimination, superparasitism and infanticide by a gregarious endoparasitoid

2008 ◽  
Vol 76 (3) ◽  
pp. 789-799 ◽  
Author(s):  
Alejandro Tena ◽  
Apostolos Kapranas ◽  
Ferran Garcia-Marí ◽  
Robert F. Luck
Keyword(s):  
Host Discrimination
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