Author
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TOSCANO, NICK - UNIV OF CA, RIVERSIDE, CA |
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PRABHAKER, NILIMA - UNIV OF CA, RIVERSIDE, CA |
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CASTLE, STEVE - PREVIOUS WCRL, BRAWLEY,CA |
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Henneberry, Thomas |
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BALLMER, G - UNIV OF CA, RIVERSIDE, CA |
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NATWICK, ERIC - UCCE EXT, BRAWLEY, CA |
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KALLENBACH, R - UCC PALO VERDE, BLYTHE,CA |
Submitted to: Silverleaf Whitefly: 1997 Supplement to the Five Year National Research and
Publication Type: Abstract Only Publication Acceptance Date: 8/1/1997 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Control of the sweetpotato and silverleaf whitefly in CA is dependent upon year-round insecticide use. Overlapping of crops which host whiteflies throughout the annual cropping cycle encourages high whitefly densities. There is a potentially high selection pressure for resistance development in Bemisia spp. A resistance monitoring technique using yellow sticky cards ssprayed with insecticides efficiently and sensitively detected resistance in whitefly field populations. In 1993-1994, the insecticide-coated yellow sticky card technique was used for monitoring resistance in B. argentifolii populations in Imperial, Palo Verde, and San Joaquin Valleys, CA. Considerable differences in RR for bifenthrin, endosulfan, chlorprifos, and methomyl treatments were observed among whitefly populations from the three geographic regions. Bioassays indicated in 1993-1994 that methomyl was effective against adults in all locations. In 1994, a grower supported resistance monitoring program was initiated using the yellow sticky card technique sprayed with grower available insecticides. This program provides baseline data for a number of insecticides used for control of B. argentifolii in CA. Continuous monitoring of the whitefly populations for changes in resistance frequencies in large regions allowed decisions regarding effective whitefly management strategies to be formed. Whitefly insecticide resistance monitoring data and management strategies were communicated to farmers and pest-control advisors. |