Sweetpotato weevil, Cylas formicarius (Fab.) (Coleoptera Brentidae) avoids its host plant when a virulent Metarhizium anisopliae isolate is present

Ronnie Dotaona, Bree A.L. Wilson, Gavin J. Ash, Joanne Holloway, Mark M. Stevens

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Metarhizium anisopliae has a wide range of coleopteran hosts, including weevils. Some susceptible insects are known to modify their behavior to prevent infection, typically detecting virulent strains by olfaction, and avoiding physical contact with sources of infection. Laboratory olfactometer assays were conducted on the sweetpotato weevil Cylas formicarius to test the hypothesis that insects would avoid a more virulent strain of M. anisopliae when presented with a strain of low virulence or an untreated control. When adult weevils were allowed to choose between paired test arenas containing sweetpotato roots and M. anisopliae isolates on agar cores, weevils avoided arenas with the highly virulent isolate QS155, showing a preference for either roots with uninoculated agar cores or cores with the low virulence isolate QS002-3. When roots or whole sweetpotato plants were inoculated with M. anisopliae, the preferences of weevils remained broadly similar; weevils were repelled by the highly virulent isolate QS155 when tested against either QS002-3 or uninoculated roots and plants, however weevils were not repelled by the low virulence isolate QS002-3 tested against uninoculated controls. When single-sex groups of weevils were tested separately in the olfactometer using uninoculated whole plants and plants treated with isolate QS155, males and females responded similarly and statistically identical preferences were found for the untreated plants. When weevils were released singly at different times of the day the response time for males was significantly shorter in the afternoon compared to the morning. Males were always significantly faster to respond to olfactory stimuli than females. Understanding factors that may lead to avoidance of virulent M. anisopliae strains by C. formicarius will be an essential part of developing an ‘attract-and-infect’ strategy for the management of C. formicarius.
Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalJournal of Invertebrate Pathology
Volume148
Early online date17 Jul 2017
DOIs
Publication statusPublished - Sep 2017

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Cylas formicarius
Cylas formicarius elegantulus
Brentidae
Metarhizium anisopliae
Curculionidae
host plant
host plants
Coleoptera
virulence
agar
olfactometers
insect
olfaction
insects
assay
smell
host range
infection
testing

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title = "Sweetpotato weevil, Cylas formicarius (Fab.) (Coleoptera Brentidae) avoids its host plant when a virulent Metarhizium anisopliae isolate is present",
abstract = "Metarhizium anisopliae has a wide range of coleopteran hosts, including weevils. Some susceptible insects are known to modify their behavior to prevent infection, typically detecting virulent strains by olfaction, and avoiding physical contact with sources of infection. Laboratory olfactometer assays were conducted on the sweetpotato weevil Cylas formicarius to test the hypothesis that insects would avoid a more virulent strain of M. anisopliae when presented with a strain of low virulence or an untreated control. When adult weevils were allowed to choose between paired test arenas containing sweetpotato roots and M. anisopliae isolates on agar cores, weevils avoided arenas with the highly virulent isolate QS155, showing a preference for either roots with uninoculated agar cores or cores with the low virulence isolate QS002-3. When roots or whole sweetpotato plants were inoculated with M. anisopliae, the preferences of weevils remained broadly similar; weevils were repelled by the highly virulent isolate QS155 when tested against either QS002-3 or uninoculated roots and plants, however weevils were not repelled by the low virulence isolate QS002-3 tested against uninoculated controls. When single-sex groups of weevils were tested separately in the olfactometer using uninoculated whole plants and plants treated with isolate QS155, males and females responded similarly and statistically identical preferences were found for the untreated plants. When weevils were released singly at different times of the day the response time for males was significantly shorter in the afternoon compared to the morning. Males were always significantly faster to respond to olfactory stimuli than females. Understanding factors that may lead to avoidance of virulent M. anisopliae strains by C. formicarius will be an essential part of developing an ‘attract-and-infect’ strategy for the management of C. formicarius.",
keywords = "Avoidance, Behavior, Cylas formicarius, Metarhizium anisopliae, Olfaction, Sweetpotato, Virulence",
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Sweetpotato weevil, Cylas formicarius (Fab.) (Coleoptera Brentidae) avoids its host plant when a virulent Metarhizium anisopliae isolate is present. / Dotaona, Ronnie; Wilson, Bree A.L.; Ash, Gavin J.; Holloway, Joanne; Stevens, Mark M.

In: Journal of Invertebrate Pathology, Vol. 148, 09.2017, p. 67-72.

Research output: Contribution to journalArticle

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T1 - Sweetpotato weevil, Cylas formicarius (Fab.) (Coleoptera Brentidae) avoids its host plant when a virulent Metarhizium anisopliae isolate is present

AU - Dotaona, Ronnie

AU - Wilson, Bree A.L.

AU - Ash, Gavin J.

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N2 - Metarhizium anisopliae has a wide range of coleopteran hosts, including weevils. Some susceptible insects are known to modify their behavior to prevent infection, typically detecting virulent strains by olfaction, and avoiding physical contact with sources of infection. Laboratory olfactometer assays were conducted on the sweetpotato weevil Cylas formicarius to test the hypothesis that insects would avoid a more virulent strain of M. anisopliae when presented with a strain of low virulence or an untreated control. When adult weevils were allowed to choose between paired test arenas containing sweetpotato roots and M. anisopliae isolates on agar cores, weevils avoided arenas with the highly virulent isolate QS155, showing a preference for either roots with uninoculated agar cores or cores with the low virulence isolate QS002-3. When roots or whole sweetpotato plants were inoculated with M. anisopliae, the preferences of weevils remained broadly similar; weevils were repelled by the highly virulent isolate QS155 when tested against either QS002-3 or uninoculated roots and plants, however weevils were not repelled by the low virulence isolate QS002-3 tested against uninoculated controls. When single-sex groups of weevils were tested separately in the olfactometer using uninoculated whole plants and plants treated with isolate QS155, males and females responded similarly and statistically identical preferences were found for the untreated plants. When weevils were released singly at different times of the day the response time for males was significantly shorter in the afternoon compared to the morning. Males were always significantly faster to respond to olfactory stimuli than females. Understanding factors that may lead to avoidance of virulent M. anisopliae strains by C. formicarius will be an essential part of developing an ‘attract-and-infect’ strategy for the management of C. formicarius.

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