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Title: EVALUATION OF INSECTICIDE ROTATIONS AND MIXTURES AS A RESISTANCE MANAGEMENT STRATEGY FOR WHITEFLIES

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

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: Insecticide rotations and insecticide mixtures have been studied in both greenhouse and field settings to delay resistance development. Bifenthrin, endosulfan and chlorpyrifos under continuous selection increased resistance pressure. Low levels of resistance occurred in colonies exposed to similar insecticide pressure, but in a rotational scheme using the same three insecticides or mixtures of two insecticides over single compounds. Field trials to evaluate insecticide rotations and mixtures as resistance management strategies for whiteflies showed similar results. We investigated continuous treatment with single insecticides, rotation plots with 4 insecticides, a mixture treatment with bifenthrin and endosulfan, and untreated control plots. Bioassay results failed to yield discernible differences in the treatment regimens. There appeared to be a general trend of decreasing LC50s through time. Differences among various treatments were eobserved in densities of whiteflies infestations and in yield of cotton. Continuous treatment of bifenthrin and bifenthrin + endosulfan mixture had fewer whiteflies during mid- and late experiment compared to other treatments and highest yields of cotton. Although densities in rotation plots were marginally higher than bifenthrin or bifenthrin + endosulfan plots, rotation regimen produced lower densities and higher cotton yield than control plots or single treatment plots of endosulfan, chlorpyrifos or amitraz.