The 2005 ESA Annual Meeting and Exhibition
December 15-18, 2005
Ft. Lauderdale, FL

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Thursday, December 15, 2005 - 11:42 AM

First detection of the Q biotype of Bemisia tabaci (Gennadius) in the Americas: Evidence, ramifications and response

Timothy J. Dennehy, tdennehy@ag.arizona.edu1, Judith K. Brown, jbrown@ag.arizona.edu1, Benjamin DeGain, degain@ag.arizona.edu1, Marni Zaborac, zabo14@hotmail.com1, Frank J. Byrne, frank.byrne@ucr.edu2, Donald M. Rogan, rogand@email.arizona.edu1, Shai Morin,, Jeffrey A. Fabrick,, and Robert L. Nichols, BNichols@cottoninc.com5. (1) University of Arizona, Extension Arthropod Resistance Mgmt Laboratory, Department of Entomology, Tucson, AZ, (2) University of California, Riverside, Department of Entomology, Chapman 101, Riverside, CA, (3) Hebrew University of Jerusalem, Department of Entomology, Jerusalem, Israel, (4) USDA-ARS, Western Cotton Research Laboratory, 4135 E. Broadway, Phoenix, AZ, (5) Cotton Incorporated, 6399 Weston Parkway, Cary, NC

A biotype of Bemisia tabaci previously not reported from the Americas was collected in December, 2004, on poinsettia plants in Tucson, Arizona. This strain was strikingly less susceptible to a broad range of insecticides, relative to Arizona whiteflies. Three laboratories concluded independently that the strain, Poinsettia’04, was the Q biotype, using native polyacrylamide gel electrophoresis of non-specific esterases or sequencing of polymerase chain reaction products of a portion of the mitochondrial oxidase I gene. The Q biotype originates from the Northern Mediterranean region, where it has been associated with control problems, especially in greenhouses. Producers of commodities impacted by B. tabaci have responded aggressively to this finding, due to the economic losses that resulted from the introduction of the B biotype in the 1980’s. However, the rate at which the Q biotype will spread in the U.S. and its impact on production systems is unknown. Surveys conducted in the spring of 2005 by regulatory agencies in Arizona and California yielded four additional isolations of Q biotypes: three in California and one in Arizona. Biotype evaluations conducted from throughout Arizona field and row crops in 2001, 2003, and 2004 yielded no Q biotypes. Thus, it appears that this new biotype has been detected early in the course of its spread in the New World. We will discuss the potential pest management ramifications of this new finding, and summarize the current responses of regulatory, research, and extension sectors.

Species 1: Hemiptera Aleyrodidae Bemisia tabaci (Sweetpotato Whitefly)
Keywords: Whitefly, Biotype