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Herbert, 2006 Thrips Control in VA/NC: Overview, Insights and Options A. Herbert & S. Malone, Virginia Tech and Jack Bacheler & D. Mott, NC State.

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Presentation on theme: "Herbert, 2006 Thrips Control in VA/NC: Overview, Insights and Options A. Herbert & S. Malone, Virginia Tech and Jack Bacheler & D. Mott, NC State."— Presentation transcript:

1 Herbert, 2006 Thrips Control in VA/NC: Overview, Insights and Options A. Herbert & S. Malone, Virginia Tech and Jack Bacheler & D. Mott, NC State

2 Herbert, 2006 Avg. lint loss potential to thrips in Virginia 2001=352 2003=279 2004=341 2005=543 2006=655

3 Excellent 1112 lb Moderate 888 lb Poor 469 lb Thrips Control Levels

4 1254 lb lint 598 lb lint Herbert, Virginia Tech, 2006

5 Thrips injury rating scale 0 = no injury, 5 = dead plants 4.750.25

6 Cotton thrips sampling 10 seedlings/plot

7 The plant coverage issue!

8 Nozzle study—TAREC, VA, 2006 Herbert, 2006 Spray tipTip sizePSI TeeJet XR Flat Fan11001525 TeeJet XR Flat Fan1100217 Turbo Teejet1100160 Turbo Teejet11001526 Turbo Teejet1100217 Greenleaf Air-Mix1100150 Greenleaf Air-Mix11001525 Greenleaf Air-Mix1100217 Conejet Hollow ConeTX-644 Standard (w/o insecticide)8002VS18 CT06THP7 Roundup OriginalMAX @ 22 oz/A tank mixed with Orthene 97 @ 0.36 lb ai/A (= 6 oz/A) @ 1st tl & 2-3 tl (May 22 & 30), 10 gpa. Variety = DP 434 RR.

9 Nozzle study—adult thrips Herbert, 2006CT06THP7 Mean no. adult thrips/10 plants NS=no difference among treatments Significantly different (P=0.05) * * NS *

10 Nozzle study—immature thrips Herbert, 2006CT06THP7 Mean no. immature thrips/10 plants NS=no difference among treatments Significantly different (P=0.05) * * NS * *

11 Nozzle study—thrips injury ratings Herbert, 2006CT06THP7 NS=no difference among treatments Significantly different (P=0.05) * * NS Mean plant injury rating NS **

12 Nozzle study—lint yield Lint yield (lb/acre) a a a a a a a b a Herbert, 2006 a

13 Hilldrop vs. single seed—TAREC, 2006 Herbert, 2006 ProductPlate Mean thrips injury 1 Stand count per 80 row ft Yield lb lint/A Temik 5 lbSingle0.78231 b1268 a Temik 5 lbHilldrop0.74249 a1135 a Gaucho Grande 0.375 mg ai/seedSingle0.58253 a1264 a Gaucho Grande 0.375 mg ai/seedHilldrop0.56255 a1384 a UntreatedSingle3.25224 b849 b UntreatedHilldrop3.27233 b837 b CT06THP11 DP 444 BG/RR 1 Based on a scale of 0 (no injury) to 5 (dead plants), averaged over 4 sample dates.

14 Improvements in seed treatment technology Gaucho 0.23 0.375 Cruiser 0.300.34 mg ai/seed Thiamethoxam 0.34 + Abamectin 0.15 (Avicta Complete Pak) Imidacloprid + Thiodicarb (Aris)

15 THP 4 Virginia Tech 2006

16 Thrips counts—adults Herbert, 2006CT06THP8 Mean no. adult thrips/10 plants

17 Thrips counts—immatures Herbert, 2006CT06THP8 Mean no. immature thrips/10 plants

18 Herbert, 2006CT06THP8 Mean plant injury rating * * * * * NS NS=no difference among treatments Significantly different (P=0.05) * Thrips injury ratings

19 Lint yields--CT06THP4 Lint yield (lb/acre) b a c Herbert, 2006 b

20 THP 6 Virginia Tech 2006

21 Thrips counts—adults Herbert, 2006CT06THP6 Mean no. adult thrips/10 plants

22 Thrips counts—immatures Herbert, 2006CT06THP6 Mean no. immature thrips/10 plants

23 Thrips injury ratings Herbert, 2006CT06THP6 Mean plant injury rating NS=no difference among treatments Significantly different (P=0.05) * * * *

24 Lint yields—CT06THP6 Lint yield (lb/acre) b a a a a a a Herbert, 2006

25 Lint yields—CT06THP6 Lint yield (lb/acre) a a a a a a Herbert, 2006

26 Lint yield summary—VA, 2005-2006 Lint yield (lb/acre) Herbert & Bacheler, 2006 n = 14 88163324

27 Lint yield summary—NC, 2005-2006 Lint yield (lb/acre) Herbert & Bacheler, 2006 n = 3 41352451

28 Herbert, 2005 Mean thrips injury rating—CT05THP4 Mean injury rating 0.375 With Orthene 97 4 oz BC 0.34 0.15 3.5 lb5 lb0.3750.34 0.15 3.5 lb5 lb

29 Overall yield comparisons—2005 tests MaterialAlone+ Orthene Orthene Δ Gaucho Grande1563159532 Avicta Pak1564163975 Temik 5.01638168345 Overall--- 60 Orthene 97 broadcast @ 4.0 oz/A Herbert, 2005

30 Cotton aphid treatments may be less with Temik vs. seed trt. + foliar Bacheler, NC State

31 NC acreage treated for cotton aphids (2004-2005 Consultants’ Survey) Usage pattern % acres treated Odds of treatment High Temik (100%) 6.751/15 Low Temik (25.5%) 15.71/6 Difference: 2.3-fold Bacheler, NC State

32 Spider mite treatments may be less with Temik vs. seed trt. + foliar Bacheler, NC State

33 NC acreage treated for spider mites (2004-2005 Consultants’ Survey) Usage pattern % acres treated Odds of treatment High Temik (100%) 0.581/170 Low Temik (25.5%) 5.31/19 Difference: 9.1-fold Bacheler, NC State

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