Journal of Insect Science (2008) 8 (4), p. 41 (Roditakis et al.)

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Emmanouil Roditakis, Nikos E. Roditakis, Maria Grispou, John Vontas and Anastasia Tsagkarakou (2008)
Imidacloprid resistance of Bemisia tabaci in Crete, Greece
Journal of Insect Science 8 (4), 41-41
in P. A. Stansly and C.L. McKenzie, organizers: Fourth International Bemisia Workshop - International Whitefly Genomics Workshop, December 3-8, 2006, Duck Key, Florida, USA
Abstract: Bemisia tabaci (Homoptera: Aleyrodidae) is considered a major pest of both vegetable and flower crops in Crete, Greece. The first severe pest management problems were reported after repeated failures to control the pest during a sudden TYLSV outbreak in 2001. In a survey during 2002-03, high resistance levels were recorded against pyrethroids and neonicotinoids in whitefly populations (Biotype Q) collected from greenhouses practicing conventional pest management. In 2005 and 2006, during an extensive resistance monitoring survey for imidacloprid resistance, toxicological bioassays were preformed on 41 whitefly populations, collected from greenhouses located in the main vegetable producing areas in southern Crete at the end of the growing season (May - June). LC50 ranged from 14 to 267 mg a.i./l in 2005 and from 24 to 705 mg a.i./lt in 2006, indicating a rapid progress of the resistance problem in the B. tabaci populations of Crete. Studies on the mechanisms of resistance to imidacloprid showed that P450 monooxygenase activity with the substrate ethoxycoumarine was substantially elevated in a highly resistant strain, compared to the susceptible strain SUD-S. Using the metabolic inhibitors piperonyl butoxide (PBO) and S,S,S-tributyl phosphorotrithioate (DEF) the implication of cytochrome P450-dependent monooxygenases was confirmed; however, the mortality was still lower than that of the susceptible strain, suggesting the possible involvement of additional resistance mechanisms.
Database assignments for author(s): Emmanouil Roditakis, John Vontas, Anastasia Tsagkarakou

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest


Pest and/or beneficial records:

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


Bemisia tabaci biotype MED Greece