Citrograph article on Fuller Rose Beetle - Citrus Research Board

ifenthrin efficacy data we will havequite soon.The first two applications of 0.25 lbAI/acre or the first application of 0.5 lbAI/acre are legal under the 2ee label.If a 24c Special Local Needs label isgranted, an application of the second0.5 lb AI/acre would be allowed (a totalof 1.0 lb AI/acre, which is the amountshown by research to be effective).It is critical that bifenthrin trunksprays do not contact foliage and fruitbecause the current tolerance, whichwas originally established for a soil application,is quite low.Concurrently, we are working withthe IR-4 program to register a morepractical method of bifenthrin applicationthat we hope would allow contactwith fruit and foliage; if successful, thiswill take 3 or more years.At present, applications must be appliedusing a homemade “wand” similarto that depicted in Figures 5-7. This willbe required on the 24c label, if it is approved.Each grower or PCA may haveideas on how to build their own wandapplicator and/or to power the spray.The key features of this strategySummary of the Bifenthrin Trunk Spray Strategy:1. Build a model wand sprayer by early May so you can test it and consider modifications.2. Skirt-prune to a minimum height of 24” by early June.3. Treat with either 4 applications of 0.25 lb AI/acre bifenthrin spaced out every 6weeks or 2 applications of 0.5 lb AI/acre applied 12 weeks apart. (Stay tuned for aCalifornia Citrus Quality Council [CCQC] advisory by early May advising which strategyis most effective).4. 0.5 lb AI/acre is allowed under the Brigade WSB 2ee label. Legal use of the second0.5 lb AI/acre (total of 1.0 lb AI/acre) depends on approval of CCQC’s 24c application(CCQC advisory expected early August).5. The trunk spray must be hand-applied using a home-built u-shaped wand. Trunksprays cannot be applied with a weed sprayer or other device that would allow thespray to contact foliage and/or fruit.6. It is critical the first bifenthrin trunk spray be applied BEFORE significant emergenceof adult beetles out of the soil occurs – get the spray on by early June.7. The grove must be patrolled every 4-6 weeks to make sure that weeds growingunder trees or suckers/branches do not allow FRB adults to bypass the trunk.are: (1) the spray must contact onlythe trunk (soil runoff is ok but applicationto the trunk provides the bestcontrol); (2) the spray cannot contactthe foliage or fruit; (3) to be effectiveand persistent, a high spray concentrationis needed (5-10 gpa or less is ideal)applied to 12”–18” of trunk height allthe way around the trunk; (4) it maybe necessary to move irrigation emittersaway from the trunk so they do notwash bifenthrin off the trunk (shouldknow by the time of the April 22 FRBmeeting at Lindcove); (5) at this con-www.citrustreesource.com32 <strong>Citrograph</strong> March/April 2013SuperCitrus Trees559-592-2304Container grown ininsect resistant structuresUnique pot design growsmassive root systemDelivered in special “sock”for easy handlingStronger Rootsmake SuperCitrus Trees

centration, the bifenthrin will be a thickslurry – agitation of the spray solutionis important; and (6) we suggest growersand/or PCAs build their own wandapplicator well in advance (by earlyMay) and test it out so as to considerpossible changes or improvements.Stay tuned for future developmentswhich will be posted on thefollowing two web sites: http://ucanr.org/sites/KACCitrusEntomology/ andhttp://www.calcitrusquality.org/.AcknowledgementsWe would like to thank MichaelRust and the many pest control advisorsand growers who contributedideas that led to the trunk treatmentstrategy for Fuller rose beetle control.Thanks are also due Alan Urena, LindsayRobinson, Rachael Craig, and JanineAlmanzor (in the Morse lab) andSara Scott, Jennifer Ruvalcaba, and JamieNemecek (Grafton-Cardwell staff)who collected much of the data andhelped put on trials that contributed tothis evolving approach.Thanks are also due Jim Cranneyand the California Citrus QualityCouncil for setting up meetings dealingwith Fuller rose beetle where the industryprovided feedback and for helpin exploring ways to register bifenthrintrunk sprays.Also, appreciation goes to DanSeymore of the Lindcove Research andExtension Center who built the handwand application devices that wereused in our field trials, and to the staffat UC Riverside Agricultural Operationswho were of great assistance withskirt pruning trees used in trunk treatmentevaluations.We thank FMC Corp., NovaSource,Syngenta, and Gowan for providingchemicals that were used in field trials,the IR-4 Program (especially BeckySisko) for input into fruit residue studies,and the Citrus Research Boardwhich funds our research in part.Dr. Joseph Morse is a Professorof Entomology and Dr. Beth Grafton-Cardwell is an Extension Specialist andResearch Entomologist. Both are membersof the Department of Entomology,University of California, Riverside.Further ReadingCranney, J. 2011. Renewed Focuson Fuller Rose Beetle Control. <strong>Citrograph</strong>July/Aug 2(4): 20.Magarey, R.D., G.A. Buchanan,P.R. Franz, and G.S. Roberts. 1993.Evaluation of Lamdacyhalothrin andDeltamethrin Trunk Treatments forControl of Fuller’s Rose Weevil, Asynonychusgodmani (Boheman) (Coleoptera:Curculionidae), on Citrus. PlantProtection Quarterly 8(4): 123-126.Morse, J.G. and K.R. Lakin. 1987.A Degree-Day Model for Fuller RoseBeetle. <strong>Citrograph</strong> 72: O-P.Morse, J.G. and J.E. Lindegren.1996. Suppression of Fuller Rose Beetle(Coleoptera: Curculionidae) onCitrus with Steinernema carpocapsae(Rhabditia: Steinernematidae). FloridaEntomologist 79(3): 373-384.Morse, J.G., P.A. Phillips, P.B.Goodell, D.L. Flaherty, C.J. Adams,and S.I. Frommer. 1987. MonitoringFuller Rose Beetle Populations in CitrusGroves and Egg Mass Levels onFruit. Sunkist Pest Control Circular547: 1-8.l“GREAT NEWS”Metropolitan Water Districtwill help pay for your Ecoflow System!• MWD recognizes all the tests and studies that we’ve done.• MWD will pay 50% of the cost, including installation of the Ecoflow and related irrigation parts and equipment.Currently Installed in 120+ Citrus Groves!Typical installed results have been:• 25% Water Usage Reduction • 40% Root Zone Chlorides Reduction • 15% Additional YieldFOR MORE INFORMATION & HOW TO APPLY FOR THE MWD SUBSIDYContact Earl Coleman at 951-587-8375 or earlcoleman288@msn.comManufactured exclusively in the U.S.A. by Morrill Industries, Inc.March/April 2013 <strong>Citrograph</strong> 33