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Title: MANAGEMENT STRATEGIES FOR THE CONTROL OF SILVERLEAF WHITEFLY, BEMISIA ARGENTIFOLII (HOMOPTERA: ALEYRODIDAE)

Author
item TOSCANO, NICK - UNIV OF CA, RIVERSIDE, CA
item PRABHAKER CASTLE, NILIMA - UNIV OF CA, RIVERSIDE, CA
item Henneberry, Thomas
item Castle, Steven

Submitted to: Entomology International Congress Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 8/1/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Imidacloprid provides season-long control in fall vegetables and spring melons and requires fewer treatments than spray insecticides. Resistance management programs are essential for prolonging the life of imidacloprid under field conditions. We are evaluating restriction of imidacloprid treatments, alternation insecticides having different modes of action to delay resistance and effect of immigration of susceptible individuals. A resistant strain of Bemisia tabaci was established by selection with imidacloprid for about 2 years. Stability of resistance in this strain is under evaluation using a rotation regimen of different chemistries and by withdrawal of imidacloprid selection. Susceptibility was monitored using a hydroponic bioassay developed in this laboratory. Resistance remained high with continuous selection. Lower levels of resistance were observed in whiteflies subjected to a rotation regimen with different insecticides. Resistance was slow to decline initially in the absence of selection but declined considerably after a few generations. Resistance declines when treatments are withdrawn. Resistance can be delayed under a rotational scheme in combination with different chemistries thus prolonging the effectiveness of imidacloprid.