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Rice Stink Bug Management : A program in transition Michael Stout, Bryce Blackman, Jason Hamm & Natalie Hummel.

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Presentation on theme: "Rice Stink Bug Management : A program in transition Michael Stout, Bryce Blackman, Jason Hamm & Natalie Hummel."— Presentation transcript:

1 Rice Stink Bug Management : A program in transition Michael Stout, Bryce Blackman, Jason Hamm & Natalie Hummel

2 Life Cycle and Biology Adults begin overwintering in October and emerge from overwintering in March/April Populations in spring and early summer build up on alternate grass hosts Sprangletop Signalgrass Crabgrass Barnyard grass

3 Life Cycle and Biology Females lay rows of eggs Laid over 900 in lab tests Eggs turn black as they age

4 Life Cycle and Biology Nymphs hatch in 4-11 daysNymphs hatch in 4-11 days Five instars before adulthoodFive instars before adulthood

5 Life Cycle and Biology Adults and nymphs suck fluid from developing grainsAdults and nymphs suck fluid from developing grains

6 Economic Importance Potential for yield lossesPotential for yield losses Feeding introduces fungi that causes peckFeeding introduces fungi that causes peck Leads to discoloration and broken kernelsLeads to discoloration and broken kernels Reduces grade and overall value of grainReduces grade and overall value of grain

7 Current Research Information System Item No. 1 of 1 ACCESSION NO: SUBFILE: CRIS PROJ NO: LAB03993 AGENCY: NIFA LA.B PROJ TYPE: SPECIAL GRANT PROJ STATUS: NEW CONTRACT/GRANT/AGREEMENT NO: PROPOSAL NO: START: 01 SEP 2009 TERM: 31 AUG 2012 FY: 2009 GRANT YR: 2009 GRANT AMT: $60,898 INVESTIGATOR: Stout, M.; Hummel, N.; Groth, D.; Machtmes, K.; Bernhardt, J.; Tindall, K.; Way, M. PERFORMING INSTITUTION: Entomology LOUISIANA STATE UNIVERSITY BATON ROUGE, LOUISIANA REVISING MANAGEMENT PROGRAMS FOR THE RICE STINK BUG IN SOUTHERN RICE

8 Survey work – Dr. Hummel

9 Insecticide used to control rice stink bug in 2009 in Louisiana and Texas Percenta ge (%) LA Percenta ge (%) TX Malathion57% EC 298 Sevin 80S 00 Sevin 4F 00 Methyl 4 EC 1936 KarateZ 6748 Mustang Max 3856 Prolex 30 Proaxis 00 Tenchu 20SG 140 Other 012

10 Components of a RSB management program Scouting and population monitoring Thresholds for insecticide applications Insecticide applications Alternative management tactics

11 For each component of the RSB management program… What is the current practice? What are the weaknesses of the current practice? What are we doing about it? What should we be doing about it?

12 Components of a RSB Management Program Scouting: Thresholds: Insecticides: Alternatives to insecticides:

13 Scouting / population monitoring Begin at 50 – 75% heading Begin at 50 – 75% heading Sweep net inch diameter Sweep net inch diameter 180˚ every step, at least 10 sweeps at 10 locations 180˚ every step, at least 10 sweeps at 10 locations

14 What are the weaknesses of this scouting method? Standardization / consistency among samplers Labor intensive How efficient?

15 Description: Dr. Roger Leonard demonstrates how to effectively use a sweep net in a soybean field for insect scouting. Primary Audience: General Resource Updated: 5/4/2010 8:52:14 AM FileType Using a Sweep Net-Dial-UpWMV Using a Sweep Net-BroadbandWMVTo save, right click on file and select "Save Target As..." Using a Sweep Net for Insect Scouting

16 Number of RSB seeded in 20 ft plot Number of RSB recaptured

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19 % Response Methyl Salicylate Caryophyllene Linalool Limonene Control * P < 0.05 Control * Odor Source

20 Prospective Technology Electronic nose – Handheld volatile analysis computer – Tested on stink bugs in cotton

21 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Insecticides: Alternatives to insecticides:

22 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Insecticides: Alternatives to insecticides:

23

24 Current Thresholds First two weeks of heading: 3 bugs per 10 sweeps (30 per 100) After first two weeks: 10 bugs per 10 sweeps (100 per 100)

25 Potential weaknesses of these thresholds Origin of thresholds unknown; has not been updated for 25+ years to account for new varieties, etc Thresholds in TX recently increased Growers satisfied with thresholds, but are we spraying too much? Thresholds for different varieties, ratoon?

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27 RSB Cage Study Four replications Cages infested with RSB at 50-75% heading Cages removed after 11 days Plots sprayed biweekly thereafter until grain hardening

28 RSB Cage Study Treatments: 0, 1, 2, 5, or 10 stink bugs per 6.67 sq ft cage Corresponds (roughly) to 0.8, 1.6, 4, and 8 x threshold

29 RSB Cage Study 2010-Cage Study Yield (grams) Rep 1Rep 2Rep

30 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Revise thresholds Insecticides: Alternatives to insecticides:

31 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Revise thresholds Insecticides: Alternatives to insecticides:

32 Currently registered insecticides Pyrethroids (Karate, Mustang Max, Declare, Prolex) Pyrethroids (Karate, Mustang Max, Declare, Prolex) Organophosphates (malathion, methyl parathion) Organophosphates (malathion, methyl parathion) Sevin (carbaryl) Sevin (carbaryl) Neonicotinoids (dinotefuran – Section 18 in Texas) Neonicotinoids (dinotefuran – Section 18 in Texas)

33 What are the shortcomings of our current arsenal of insecticides? Some options ineffective Short residual activities Loss of methyl parathion Concerns about resistance

34 EPA has received requests from the registrants to voluntarily cancel all product registrations containing methyl parathion, a restricted use organophosphate insecticide and acaricide used primarily on cotton, corn, and rice, as well as on other agricultural crops. These requests would terminate the last methyl parathion products registered for use in the U.S., effective December 31, End-use products will not be sold after August 31, 2013, and end-use products cannot legally be used after December 31, 2013.

35 LocationLC50 (μg)95% CI LA TX Round Mott3.51 Ganado2.80 East Bernard1.05 Beaumont0.67 AR LA MO

36 LocationLC50 (μg)95% CI LA Arkansas Amagon Gus – 1 st collection John Bernhardt Mississippi Location Location Missouri Wardell Lee Farm Marsh Farm Louisiana Texas Beaumont Gandado Kendelton0.50N/A Round Mott

37 New alternatives Declare, generic pyrethroids Tenchu (dinotefuran), Section 18 submitted for Louisiana 2011 Other neonicotinoids and pyrethroid/neonic mixes Some of these new products expected to have longer residual activities, but no evidence for this yet Tank mixes with fungicides?

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39 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Revise thresholds Insecticides: Evaluate new insecticides and cooperate in registration efforts Alternatives to insecticides:

40 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Revise thresholds Insecticides: Evaluate new insecticides and cooperate in registration efforts Alternatives to insecticides:

41 RSB vs Weed Density

42 RSB Variety Tolerance Trials four experiments planted at different times, each with 4 reps – 1 CL 151, 2 CL161, 3 Cocodrie, 4 CL 131 Top 4 long grain varieties in 2009 – 5 Neptune, 6 Jupiter (replaced w/ Bengal) Medium grain varieties – 7 CLXL723 Hybrid – 8 Kaybonnet and 9 Lagrue Displayed tolerance in previous tests

43 RSB Variety Tolerance Trials

44 Components of a RSB Management Program Scouting: Extension efforts to standardize sampling methods; research on attractants Thresholds: Revise thresholds Insecticides: Evaluate new insecticides and cooperate in registration efforts Alternatives to insecticides: Host-plant resistance and cultural practices

45 Questions and comments: What should we be doing? Scouting video? New sampling approaches? Scouting video? New sampling approaches? Revise thresholds? Revise thresholds? Evaluation of insecticides? Evaluation of insecticides? Host-plant resistance research? Cultural practices? Host-plant resistance research? Cultural practices?

46 Author Michael Stout


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