Pest Management Science (2010) 66, 949-955

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J. Cristian Vidal-Quist, Pedro Castañera and Joel González-Cabrera (2010)
Cyt1Aa protein from Bacillus thuringiensis (Berliner) serovar israelensis is active against the Mediterranean fruit fly, Ceratitis capitata (Wiedemann)
Pest Management Science 66 (9), 949-955
Abstract: BACKGROUND: Ceratitis capitata (Wiedemann) is one of the world's most destructive fruit pests. The aim of this study was to ascertain insecticidal activity of Bacillus thuringiensis (Berliner) delta-endotoxins to C. capitata.
RESULTS: Among 42 selected Bacillus strains, only B. thuringiensis serovar israelensis (Bti) solubilised protoxins showed biological activity against C. capitata neonate larvae, whereas Bti spore and crystal mixture was inactive. Insecticidal activity of Bti protoxins was significantly enhanced by incubation with Culex pipiens L. gut extracts. Overdigestion of Bti protoxins with Sesamia nonagrioides (Lefebvre) gut extracts suppressed biological activity against C. capitata, and this correlated with degradation of Cyt toxins. Cyt1Aa solubilised protoxin showed the highest toxicity, LC50 after 7 days of 4.93 µg cm-2, while proteolytical processing of Cyt1Aa protoxins by larval gut extracts did not enhance insecticidal activity.
CONCLUSION: The present study provides evidence for the first time of the insecticidal activity of a B. thuringiensis strain against C. capitata and identifies a single delta-endotoxin with potential for controlling this pest.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Joel Gonzalez-Cabrera

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
control - general
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Ceratitis capitata
Bacillus thuringiensis Cyt1A-toxin (entomopathogen) Ceratitis capitata
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