PublisherThe University of Arizona.
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AbstractThe sweetpotato whitefly (Bemisia tabaci) is a destructive agricultural pest worldwide and in Arizona. Currently, in Arizona, the dominant population in field crops (such as cotton) is comprised exclusively of biotype B, whereas greenhouse populations (on ornamental plants, such as poinsettia) are comprised of biotype B, haplotype 1 of the Q1 subclade (Q1H2) of biotype Q, and haplotype 45 of the Q2 subclade (Q2H45) of biotype Q. To determine the potential field invasiveness of the Q1H2 and Q2H45, mixed cohorts were established on pesticide-free cotton containing either B/Q1H2, B/Q2H45, or Q1H2/Q2H45 competitions. The biotype composition of each cohort was monitored via periodic sampling and biotype determination. As expected, the B biotype dominated the Q biotype; unexpectedly, however, the Q2H45 biotype lasted longer than Q1H2 (B biotype dominance occurred at the 3rd and 2nd generations, respectively). Also unexpectedly, the Q2H45 biotype is maintaining ~95% dominance over Q1H2 (currently at the 3rd generation). The local Q2H45 haplotype of whitefly, compared to global strains, seems to exhibit a greater level of invasiveness relative to the local Q1H2 haplotype, though the B biotype out-competes both Q strains in a selection-free environment.
Degree ProgramHonors College
Molecular and Cellular Biology