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Cotton Grower Meetings, 2010 Insect Management

Cotton Grower Meetings, 2010 Insect Management . Jack Bacheler Dominic Reisig NCSU. Cotton insect control cost estimates North Carolina, 2009. Foliar treatments for thrips 2003-09 Consultants Survey. % treated. At-planting options: Consultants’ clients, 2009. % selected. 47.3. 39.1.

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Cotton Grower Meetings, 2010 Insect Management

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  1. Cotton Grower Meetings, 2010 Insect Management Jack Bacheler Dominic Reisig NCSU

  2. Cotton insect control cost estimates North Carolina, 2009

  3. Foliar treatments for thrips 2003-09Consultants Survey % treated

  4. At-planting options: Consultants’ clients, 2009 % selected 47.3 39.1 13.6 Seed Temik Seed + Temik

  5. Foliar treatments for thrips planting option Consultants’ clients, 2009 86.7 68.7 % treated 29.3 Seed Temik Seed + Temik

  6. Bottom line: value of thrips control options, 2005-2009 (12 tests) * Temik = 3.25/ lb.; Orthene = $10.00/ lb.; Seed trt. = $15.90/acre ** @ 800 lb./ acre and $0.65/ lb.; 3.5 seed/ft. & 38” rows

  7. Flaring* of selected products on cotton aphids * Flaring : = none; 3.0 = severe Aeris Temik Avicta Bidrin Acephate Pyrethroid

  8. Spider mite and aphid treatments averaged 2 to 10-fold less with Temik vs. seed trt. + foliar (2004-2009). Ave. = 5.1% 1.4%

  9. Thrips control options based on planting date?

  10. Thrips control options based on planting date (Conceptual schematic)

  11. Thrips control options based on planting date (Conceptual schematic)

  12. Thrips control options based on planting date (Conceptual schematic)

  13. High & low temperature April 15 - June 15; Edgecombe Co. 2009 Temperature (*F) May 11 May 20 June 15

  14. Yield difference: Temik or seed trt. + Orthene vs. UT check; Rocky Mount, 2009 (3 tests planted on May 11 & 1 on May 20) +235 +199 +193 +192 +147 Yield gain (lb. lint/acre) +7 - 18 May 11 May 11 May 11 May 20 Temik (5 lb.) Seed trt. + Orthene

  15. Yield difference: Temik or seed trt. + Orthene vs. UT check; Rocky Mount, 2009 (n = 4 tests) +235 This test yielded approx. 100 lb. more lint/acre than ave. of the 1st 3 tests. +199 +193 +192 +147 Yield gain (lb. lint/acre) +7 - 18 May 11 May 11 May 11 May 20 Temik (5 lb.) Seed trt. + Orthene

  16. What have we learned about managing stink bugs?

  17. Declining insecticide use for late season pests in North Carolina apps./ acre Years Era

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

  19. 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

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

  21. Bolls become safe from stink bug damage later in the bloom period

  22. Boll age and size vs. yield loss > 1.25” diam.)

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

  24. Stink bugs damage cotton less: 1) when there are fewer susceptible bolls early in the bloom period 2) when bolls are no longer susceptible to damage late in the bloom period Dynamic threshold (% by week of bloom): 50, 30, 10, 10, 10, 20, 30, 50

  25. 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 If threshold has been met: treatments were with pyrethroid + dicrotophos(e.g., Baythroid @ 0.03 + Bidrin @ 0.25 lb ai/acre)

  26. Stink bug threshold tests (n = 47 total tests; NC, SC, & GA; 2005-2008)

  27. Stink bug levels defined • High/Moderate: 2+ sprays at 20% threshold • Low/Moderate: 1 spray at 20% threshold • Low: 0 spray at 20% threshold

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

  29. Field device for stink bug Scouting in the Southeast

  30. Side 1

  31. Side 2

  32. External boll damage ??

  33. Conventional, BG, WideStrike and BGII against bollworms and stinkbugs, 2005-2009 (n=717 cotton fields) Total damage Stink bug damage Bollworm damage % Boll damage 3.3 0.23 0.12 0.84 BG BG BG WS WS WS BG II BG II BG II Conv. Conv. Conv.

  34. Conventional, BG, WideStrike and BGII against bollworms and stinkbugs, 2005-2009 (n=717 cotton fields) Total damage Stink bug damage Bollworm damage 5.6 5.5 % Boll damage 4.5 3.6 3.3 0.23 0.12 0.84 BG BG BG WS WS WS BG II BG II BG II Conv. Conv. Conv.

  35. Variability in stink bug damage to bolls

  36. Conventional, BG, WideStrike and BGII against bollworms and stinkbugs, 2005-2009 (n=717 cotton fields) Total damage Stink bug damage Bollworm damage (adjusted damage) 4.7 % Boll damage 2.2 2.2 3.3 1.8 2.7 1.4 2.4+ 2.4- 0.23 0.12 0.84 BG BG BG WS WS WS BG II BG II BG II Conv. Conv. Conv.

  37. Cotton Insect Corner (just Google) • 2010 insecticide rating chart (0 to 5) • Managing Stink Bugs in the Southeast

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