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 transcript:

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

Herbert, 2006 Avg. lint loss potential to thrips in Virginia 2001= = = = =655

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

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

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

Cotton thrips sampling 10 seedlings/plot

The plant coverage issue!

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

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

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

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

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

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 lbSingle b1268 a Temik 5 lbHilldrop a1135 a Gaucho Grande mg ai/seedSingle a1264 a Gaucho Grande mg ai/seedHilldrop a1384 a UntreatedSingle b849 b UntreatedHilldrop 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.

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

THP 4 Virginia Tech 2006

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

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

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

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

THP 6 Virginia Tech 2006

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

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

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

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

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

Lint yield summary—VA, Lint yield (lb/acre) Herbert & Bacheler, 2006 n =

Lint yield summary—NC, Lint yield (lb/acre) Herbert & Bacheler, 2006 n =

Herbert, 2005 Mean thrips injury rating—CT05THP4 Mean injury rating With Orthene 97 4 oz BC lb5 lb lb5 lb

Overall yield comparisons—2005 tests MaterialAlone+ Orthene Orthene Δ Gaucho Grande Avicta Pak Temik Overall Orthene oz/A Herbert, 2005

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

NC acreage treated for cotton aphids ( 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

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

NC acreage treated for spider mites ( 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