MONITORING INSECTICIDE RESISTANCE IN THE SILVERLEAF WHITEFLY (BEMISIA ARGENTIFOLII) POPULATIONS

Authors: TOSCANO, NICK - UNIV OF CA, RIVERSIDE; PRABHAKER-CASTLE, NILIMA - UNIV OF CA, RIVERSIDE; Castle, Steven; 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: Development of insecticide resistance is a particular concern with Bemisia sp., when applications of a single insecticide are repeatedly made for control. High levels of resistance to both organophosphates and pyrethroids were documented in Bemisia sp. in the US and elsewhere in the world. Development of insecticide resistance in Bemisia sp. has highlighted need for an effective resistance management strategy. Resistance monitoring can be an effective component of a resistance management program by contributing information on response to insecticides in the target population. Detection of changes in field resistance can facilitate use of alternative control measures, including use of synergists, rotation to a different insecticide or reduction in number of insecticide applications. Successful insecticide resistance monitoring depends on availability of simple and reliable methods of monitoring. A resistance monitoring technique developed by Prabhaker et al. using yellow sticky cards sprayed with insecticides efficiently and sensitively detected resistance in field populations. Distribution of resistance in the silverleaf whitefly, B. argentifolii, in CA was determined with this technique. Field populations of adult whiteflies exhibited various levels of resistance or lack of resistance to bifenthrin, endosulfan, chlorpyrifos, methomyl and fenpropathrin. Whitefly population responses to various insecticides was distributed to clientele through newsletters and newspapers.