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    Relative Susceptibility of Whiteflies to Danital® + Orthone® Over a 5-year Period

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    Author
    Castle, S. J.
    Ellsworth, P. C.
    Prabhaker, N.
    Toscano, N. C.
    Henneberry, T. J.
    Affiliation
    USDA-ARS Western Cotton Research Laboratory, Phoenix
    The University of Arizona, Department of Entomology & Maricopa Agricultural Center
    University of California, Riverside, Department of Entomology
    Issue Date
    2001
    Keywords
    Agriculture -- Arizona
    Cotton -- Arizona
    Cotton -- Insect investigations
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Cotton: A College of Agriculture Report
    Abstract
    As part of a program to assess differences in susceptibility to insecticides among regional populations of Bemisia tabaci, insecticide resistance monitoring was carried out at the Maricopa Agricultural Center from fall, 1995 through 1999. Monitoring efforts were concentrated on Danitol®+Orthene® following reports of control problems and documentation of resistance to this mixture in 1995. We were interested in the longer-term dynamics of resistance in light of radically altered treatment regimens beginning with the use of IGRs in 1996. Although the frequency of susceptible individuals to Danitol+Orthene tended to increase in the later years, highly resistant individuals were still present 5 years after the resistance episode of 1995. Whitefly adults collected from various insecticide treatment plots other than Danitol+Orthene were generally uniform in their responses from the time of initial whitefly infestation until defoliation. However, a dramatic shift in susceptibility occurred following a single application of Danitol+Orthene in 1997 and 1999. The increased frequency of resistant individuals following treatment suggests that any large scale return to the use of Danitol+Orthene could rapidly select for proportionally higher numbers of resistant whiteflies and perhaps reduced control in cotton fields.
    Series/Report no.
    AZ1224
    Series P-125
    Collections
    Cotton Report 2001

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