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Title: ASSESSMENT OF TWO BIOASSAY TECHNIQUES FOR RESISTANCE MONITORING OF SILVERLEAF WHITEFLY (HOMOPTERA: ALEYRODIDAE) IN CALIFORNIA

Author
item PRABHAKER, NILIMA - UNIV OF CA, RIVERSIDE
item TOSCANO, NICK - UNIV OF CA, RIVERSIDE
item Henneberry, Thomas
item Castle, Steven
item WEDDLE, DICK - IMP CO. AG. COMM. OFF.

Submitted to: Journal of Economic Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/1/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: The relative toxicities of bifenthrin and endosulfan to silverleaf whiteflies were compared by 2 methods-treated glass vials and insecticide-coated yellow sticky cards-in tests in 4 field populations from cotton. Techniques detected relative susceptibilities of B. argentifolii adults to bifenthrin and endosulfan. The LC50s of bifenthrin ranged from 0.007 to 0.07 ug/vial for the 4 populations with the vial technique and from 0.77 to 3.55 ug(Al)/ml with the yellow sticky card technique. Relative tolerance levels to bifenthrin ranged from 2.2- to 10.1-fold were observed in the 4 populations with the yellow sticky card technique. The vial technique showed lower relative response levels. With endosulfan, the range was similar for both techniques. The frequency of resistance to 4 insecticides compared with a greenhouse susceptible strain was evaluated with the vial system against 11 populations of silverleaf whiteflies collected from various crops. Resistance to endosulfan was substantial, bu relative tolerance was considerably lower to bifenthrin. The insecticide-coated yellow sticky card technique was used for monitoring in the following year. Considerable differences in resistance ratios for the 4 insecticide treatments were observed among whitefly populations from the 3 geographic regions. Bioassays indicated that methomyl was effective against adults in all locations.

Technical Abstract: The relative toxicities of bifenthrin and endosulfan to silverleaf whiteflies were compared by 2 methods-treated glass vials and insecticide-coated yellow sticky cards-in tests in 4 field populations from cotton. Techniques detected relative susceptibilities of B. argentifolii adults to bifenthrin and endosulfan. The LC50s of bifenthrin ranged from 0.007 to 0.07 ug/vial for the 4 populations with the vial technique and from 0.77 to 3.55 ug(Al)/ml with the yellow sticky card technique. Relative tolerance levels to bifenthrin ranged from 2.2- to 10.1-fold were observed in the 4 populations with the yellow sticky card technique. The vial technique showed lower relative response levels. With endosulfan, the range was similar for both techniques. The frequency of resistance to 4 insecticides compared with a greenhouse susceptible strain was evaluated with the vial system against 11 populations of silverleaf whiteflies collected from various crops. Resistance to endosulfan was substantial, bu relative tolerance was considerably lower to bifenthrin. The insecticide-coated yellow sticky card technique was used for monitoring in the following year. Considerable differences in resistance ratios for the 4 insecticide treatments were observed among whitefly populations from the 3 geographic regions. Bioassays indicated that methomyl was effective against adults in all locations.