Extension and Research Programs Addressing the Threat of Tropical Spiderwort in Georgia E.P. Prostko*, J.T. Flanders, A.S. Culpepper, T. M. Webster, T.L.

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Presentation transcript:

Extension and Research Programs Addressing the Threat of Tropical Spiderwort in Georgia E.P. Prostko*, J.T. Flanders, A.S. Culpepper, T. M. Webster, T.L. Grey, W.K. Vencill, and J. R. Carter UGA/USDA-ARS/VSU WSSA 2006

Tropical spiderwort (a.k.a. Benghal dayflower, wandering jew, airweed) Commelina benghalensis  tropical Africa native  annual or perennial  seeds and rhizomes  above and below ground flowers  1,600 seeds/plant  alternate host of southern root-knot nematode  Reservoir for southern stem blight (white mold)  #31 in World’s Worst Weeds (Holm’s)

Why? (textbook example of a weed shift)  Increases in glyphosate use  Decreases in soil applied herbicides such a Cotoran  Increases in reduced tillage  Decreases in cultivation  Delayed emergence in early planted field corn  Lag phase

TSW in Georgia * confirmed in 29 counties by GA Dept. of Ag and UGA in 2004 (blue) * identified in 5 more counties in 2005 (black)

How do we distinguish TSW from other common members of family?  common spiderwort (Tradescantia ohiensis)  Asiatic dayflower (C. communis)  spreading dayflower (C. diffusa)  marsh dayflower (Murdannia keisak)  doveweed (Murdannia nudiflora)

TSW seedling with filamentous cotyledonary stalk

Leaf Sheaths Red Hairs On Stems

Leaf Length: Leaf Width ~ 1.5 (Less than 3:1) Mike Burton, NCSU

Dayflower/Spiderwort Flowers (Commelina spp.) Asiatic Dayflower Spreading Dayflower Tropical spiderwort From SWSS Weed ID Guide Stanley Culpepper, UGA

What have we done? Research Trials (since 2000)  cotton (36)  corn (2)  soybeans (3)  peanuts (10)  fallow/post-harvest (5)  biology (28)  physiology (4)  Total (88)

What have we done? Publications  refereed journal articles (4)  abstracts (15)  popular press articles (3)  extension bulletins (1)  research-extension reports (6)  newsletter articles (7)  Slide sets (9) (  Total (45)

Getting the Word Out  At least 60 county meetings a year –360 total (since 2000’)  specific presentations about TSW at other meetings –30 total (since 2000’)

Learning From Australians  Invited by Peanut Company of Australia (PCA) to visit country to discuss this weed problem (Feb 2004)

Biology/Ecology Discoveries  60% emergence after June 1  May planting less cotton yield loss than June planting ( 45%)  Season-long interference eliminates peanut pod production  1570 seeds, 352 aerial spathes, 6 subterranean spathes in 19 weeks  underground spathes 2 weeks before aerial

Weed-free Peanuts Weedy Peanuts No peanuts to harvest!!

Herbicides  s-metolachlor (Dual Magnum)  2,4-D, paraquat (Gramoxone), carfentrazone (Aim)  diclosulam (Strongarm), imazapic (Cadre), imazethapyr (Pursuit), MSMA, bentazon (Basagran), clomazone (Command)

Tropical Spiderwort Control in Peanut PE-07B-04 June 23, DAP Untreated Gramoxone 5.5 ozs/A + Dual 11 ozs/A (13 DAP) fb 1.44 ozs/A + Dual 11 ozs/A ( 28 DAP) (83% control on August 5, 2004)

Tropical Spiderwort Control in RR Soybeans pts/A ($16/A) (Glyphosate + Dual Magnum) 3 pts/A ($12/A) (Glyphosate + Pursuit) 33 DAT Applied 20 DAP

Tropical Spiderwort Control in Field Corn Untreated (166 bu/A) Aim 1.5 ozs/A Dual Magnum 1.33 pt/A 1% v/v (168 bu/A) 34 DAT $24/A treatment cost (excluding application)

Have our programs been successful??  Growers have been receptive to our information and have adopted many of our recommendations.  However, spiderwort continues to spread at an alarming rate!!!