Current industry LW survey update and control strategy
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1 Current industry LW survey update and control strategy Jonathan Crane, Tropical Fruit Crop Specialist Tropical Research and Education Center Homestead, FL Don Pybas, LW Coordinator Florida Avocado Administrative Committee Homestead, FL
2 Aerial survey October 2013 April 2014 Date Quadrant No. suspect trees Oct. 7 NE* 64 Oct. 8 SW* 5 Oct. 10 NW 5 Oct. 11 SE 3 Nov. 19 NE 37 Nov. 20 NW 15 Nov. 21 SW 6 Dec. 5 SE 2 *, Spectral survey Date Quadrant No. suspect trees Feb. 17 NE* 3 Feb. 18 NE/SE 5 Feb. 20 NW 23 Feb. 21 SW 4 Apr. 7 NE 20 Apr. 8 NW 23 Apr. 10 SW 2 Apr. 11 SE* 4 Source: Don Pybas, Laurel Wilt Coordinator in collaboration with Alan Flinn, Administrator for the Avocado Administrative Committee
3 Number of LW detections by month (based on LW molecular sample results) No. samples taken No. LW positives 30 Number of samples F M A M J J A S O N D J F M A M J J A S O N D J F M A M
4 Update: number of avocado tree samples taken and number of LW positives (based on molecular testing) September of 2011 to May 2014, TREC Diagnostic Clinic 461 samples submitted; 216 LW positive (47%) However, >3,600 trees (~36 acres) have been destroyed and attributed to LW (includes LW positives and symptomatic adjacent trees) (~0.51% of an estimated 700,000 trees) *, Dr. A. Palmateer, Assoc. Prof., Plant Pathology, TREC Plant Diagnostic Clinic, personal communication
5 Commercial area laurel wilt positive site map as of May 2014 ~143 sites, not all active
6 Cultivars susceptible (positive) for LW Brevard/Martin Counties Homestead Brogdon (complex hybrid) Beta (GxWI) Nadir (GxWI) Choquette (GxWI) Booth 8 (GxWI) Nesbitt (GxWI) Day (GxWI) Brooks Late (GxWI) Pollock (WI) Hall (GxWI) Choquette (GxWI) Simmonds (WI) Jim Lappeck (GxWI) Donnie (WI) Tonnage (G) Lula (GxWI) Hall (GxWI) Tower 2 (WI) Marcus Pumpkin (GxWI) Hardee(WI) Waldin (WI) Monroe (GxWI) Loretta (GxWI) Pollock (WI) Lula (GxWI) Russell (WI) Miguel (GxWI) Winter Mexican (GxM) Monroe (GxWI)
7 Current strategy and recommendations
8 Current strategy for control of RAB-LW Visual aerial survey Ground truth Molecular testing Take action to remove infested/infected trees Removing tree Chipping Burning Intensify ground scouting RAB control Chip infested wood Spray chips with insecticide + Vaporgard or NuFilm Air-blast insecticide + adjuvant Insecticides Malathion or Danitol
9 Current strategy for control of RAB-LW LW control Sanitation: complete removal (all above ground and as much of below ground wood as possible) and destruction of infested/infected trees Spray the infested area for ambrosia beetles Infuse/inject propiconazole in trees adjacent to LW positive trees yz y, some producers have implemented injection of trees z, under current testing and continued development
10 Some key issues 1. Non-RAB ambrosia beetles transmitting LW a. Non-RAB are attracted to stressed trees (e.g., lightning, Phytophthora, etc.) 2. In LW positive groves (sites) a. Killing ambrosia beetles inside trees and wood b. Killing ambrosia beetles trying to bore into trees and wood c. Killing ambrosia beetles in the LW positive area 3. Root transmission of LW among avocado trees 4. Rapid identification of LW positive trees 5. Trees not being removed and destroyed promptly 6. Funding avenues to continue the tree removal/ mitigation and research
11 Industry needs/future research Ambrosia beetle grove trapping (trap/kill system) and surveying More rapid identification of trees infested with the LW pathogen and/or RAB Continued RAB repellent research To what extent non-rab are infecting avocado with LW Continued investigations on entomopathogens On-going testing new fungicide formulations for efficacy and cost On-going infusion/ injection methodology testing Spot treatments Whole grove treatment
12 Extension-Outreach Jonathan H. Crane, UF/IFAS Tropical Research and Education Center Denise Feiber, Public Information Director, FDACS, DPI
13 Event Sponsors Title No. participants Field demonstration Workshop Workshop Workshop Infusion handson training Dr. DeEtta Mills, FIU Dr. Jonathan Crane, UF Dr. Jonathan Crane, UF Mr. Jeff Wasielweski, MD Coop. Ext. Dr. Jonathan Crane, UF Mr. Jeff Wasielweski, MD Coop. Ext. Mr. Jeff Wasielweski, MD. Coop. Ext. Potential of UA vehicles for agriculture (e.g., LW, scouting) Stop LW from spreading with infusion Update and recommendations for control of AB and LW Avocado Pests 65 Dr. Jonathan Crane, UF Two commercial growers 5 Post workshop survey response: After this presentation are you more likely to use infusion to control the spread of LW? Yes, 79%-93%
14 Registration of Tilt Worked with FDACS, Syngenta, FFVA, and IR-4 to submit and obtain new Section 18. Finished first half of 2014 Tilt residue trial (first trial completed 2013). Assisted California and Puerto Rico conduct their Tilt residue trials.
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