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Stink Bug Management in the Southeast 2010 Cotton Incorporated Crop Management Seminar

Stink Bug Management in the Southeast 2010 Cotton Incorporated Crop Management Seminar. Jack Bacheler NCSU. Insecticide Applications per Acre North Carolina Cotton, 1974-2010. Two significant events have changed cotton IPM during the last 37 years. Boll Weevil Era.

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Stink Bug Management in the Southeast 2010 Cotton Incorporated Crop Management Seminar

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  1. Stink Bug Management in the Southeast 2010 Cotton Incorporated Crop Management Seminar Jack Bacheler NCSU

  2. Insecticide Applications per Acre North Carolina Cotton, 1974-2010 Two significant events have changed cotton IPM during the last 37 years. Boll Weevil Era Mean # of insecticide apps. - - - - -- - - - - - - - - - - - Boll Weevil Free - - - - - - - - - - - - - - - - - - - - - - - - Bt Cotton - - - - - - - 1978

  3. Insecticide Applications per Acre Georgia Cotton, 1986-2009 Two significant events have changed cotton IPM during the last 24 years. Boll Weevil Era - Active BWEP- (Doesn’t include BWEP sprays) Mean # of insecticide apps. - - - - - - - - - - - - Boll Weevil Free - - - - - - - - - - - - - - - - - - - - - - Bt Cotton - - - - - - - - - - -

  4. Plant bug treatments 2004-2010 NC cotton insecticide use survey

  5. Treated Untreated

  6. North Carolina’s major boll damaging stink bug species nymph nymph adult adult nymph Green stink bug Brown stink bug

  7. Proportion of green, brown and southern green stink bugs at SE test locations, 2004-2008 =Green = Brown = Southern green = Other N 04 N 05 N 05 N 05 N 05 N 05 N 06 N 06 N 08 N 08 S 06 S 06 S 07 G 05 G 06 G 06 G 08 G 08 G 08

  8. Average number of stink bugs per 6 row feet (n = 8 tests, 2005-2008, GA and NC) Adults Nymphs Number of stink bugs 1 2 3 4 5 6 7 Week of bloom

  9. Stink bug damage to dime-sized boll

  10. Stink bug damage to bolls vs. yield; Wayne Co., 2004 6 7 5 4 3 2 1 Pounds of lint cotton / acre 0 y = -7.076 x + 1870.7 R2 = 0.895 % Boll damage

  11. Quarter-sized boll = 15/16 inch

  12. Bolls become safe from stink bug damage over time, 3.5 weeks is considered a “Safe Boll”

  13. Boll age (>3.5 weeks) and size vs. damage > 1.25” diam.

  14. Stink bugs damage cotton less: 1) when there are fewer susceptible bolls early in the bloom period 2) when bolls are no longer susceptible late in the bloom period

  15. Thresholds evaluated: • UTC: untreated control • Wkly bloom: sprayed weekly from 1st wk of bloom • 10% sprayed at 10% with 1 internal symptom • 20% sprayed at 20% with 1 internal symptom • 30% sprayed at 30% with 1 internal symptom • Dynamic 50, 30, 10, 10, 10, 20, 30, 50% by wk Treated with pyrethroid + dicrotophos(e.g., Baythroid @ 0.03 + Bidrin @ 0.25 lb ai/acre)

  16. Profit difference between use of 20% vs. Dynamic threshold (n = 47 tests; NC, SC & GA)

  17. Characteristics of a good field scouting device: • card must be durable • information must be easily understood • must explain scouting procedure • accommodate variability in state recomm. • thresholds clearly spelled out on card • show images of damage? • self-contained scouting tool

  18. Side 1

  19. Side 2

  20. Lanyard for removing decision aid

  21. Potential Cotton Pest?? Brown marmorated stink bug

  22. VA counties reporting brown marmorated stink bug, 2004.

  23. VA counties reporting brown marmorated stink bug, 2010

  24. Okra images courtesy of Barbara Leach

  25. Acknowledgements: Southeast Cotton Team Cotton Incorporated SRIPM Capstone grants

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