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Title: RESPONSES OF BEMISIA TABACI POPULATIONS IN IMPERIAL VALLEY TO BIFENTHRIN AND ENDOSULFAN IN A VIAL BIOASSAY

Author
item Castle, Steven
item Henneberry, Thomas
item WEDDLE, DICK

Submitted to: Sweetpotato Whitefly Progress Review Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The vial bioassay for contact insecticides is one technique that has been used among different regions for bioassay whitefly adult resistance. The general availability of this procedure was made possible largely through the collaboration of FMC Corporation and their interest in preserving the long-term efficacies of their insecticide products. They provided glass vials coated with either bifenthrin or endosulfan in a series of concentrations to any interested researcher working with B. tabaci or other pest species. Consequently, workers in Florida, Texas, Arizona and California have collected bioassay data for these two insecticides using the same technique. In California's Imperial Valley, monitoring responses of B. tabaci populations to bifenthrin and endosulfan began in March, 1992 and continued through September, 1993. More than a hundred bioassays were conducted with each insecticide on populations collected from various crops sand locations throughout the valley. There was little variation between years or among locations in their responses to bifenthrin. The mean LC50 for bifenthrin in 1992 was 0.043 ul/vial and in 1993 was 0.039. The range of LC50s throughout the two years was 0.008-0.160 ul/vial. For endosulfan, higher LC50s were observed in 1992 than in 1993. The mean and range of LC50s in 1992 was 57.9 and 5.7-254.9 ul/vial, and in 1993 was 35.6 and 10.8-74.4 ul/vial.