Weed Management Practices Utilized by “Top” Peanut

Producers in Georgia (2005-2006)

E. P. Prostko and J.P. BeasleyThe University of Georgia

Cooperative ExtensionWSSA-2008

1,230,000 acres planted in US43.1% in GA

Peanut Weed Problems in GeorgiaTop 10 Most Troublesome Weeds (1-5)

SWSS

SWSS

1 23

4

5

5

Peanut Weed Problems in GeorgiaTop 10 Most Troublesome Weeds (6-10)

SWSS

SWSS

6 7 8

9 10

Fungicides are applied 4-7 times/year.Fungicides are applied 4-7 times/year.

Will Duffie, 2006

Peanut Harvesting (2 step process)Digging/Inverting

Peanut Harvesting (2 step process)Combining

Georgia Peanut Achievement Club

• UGA Cooperative Extension

• Syngenta

• Since 1950

• Educational/recreational program to recognize top peanut growers in the state.

• Also known as…… One Ton Per Acre

Peanut Club Peanut Money

Maker Club

Information Obtained from Growers

• Acres/yield• Rotation• Varieties• Row pattern• Seeding rate• Planting date• Nematodes• Thrips• Soil/Foliar insects• Tillage• Weed control• Fungicides• Irrigation

Georgia Peanut Achievement Club

Year

Growers (#)

Total Peanut Acres

Average Peanut Acres

2005 21 10,279 490

2006 12 5,593 466

How good are these growers?Peanut Yields

4356

5109

2840 27502989 2874

0

1000

2000

3000

4000

5000

6000

2005 2006

Year

Yie

ld (

lbs/

A)

PAC GA US

+1516 +2359+1367 +2235

Tillage Methods

• Conventional 2005 – 91% 2006 – 92%

• Strip-Tillage 2005 – 9% 2006 – 8%

• Associated Problems weed shifts reduced

performance of DNA herbicides

Tropical spiderwort(Bengal dayflower)

Palmer Amaranth

Row Patterns

• Single Row 2005 – 33% 2006 - 8%

• Twin Row 2005 – 67% 2006 – 92%

• Why?? 10-15% increase in weed

control associated with row patterns

300-500 lb/A yield increases

1-2% increase in grade ($10/ton)

Reductions in TSWV

Single Row Twin Row

Ethalfluralin (Sonalan) or Pendimethalin (Prowl)

• 2005 Sonalan – 86% Prowl – 10%

• 2006 Sonalan – 83% Prowl – 8%

Other Herbicides Used - %Common name

Trade Name 2005 2006

bentazon Basagran 10 17

bentazon + acifluorfen

Storm 10 25

chlorimuron Classic 5 0

clethodim/

sethoxydim

Select/Poast 5 8

diclosulam Strongarm 38 58

flumioxazin Valor 38 50

imazapic Cadre 76 75

metolachlor Dual Magnum

14 25

paraquat Gramoxone 24 25

2,4-DB Butoxone 52 58

How do the “top” peanut growers in Georgia manage weeds?

• conventional tillage

• twin-rows

• ethalfluralin (Sonalan)

• diclosulam (Strongarm) and/or flumioxazin (Valor)

• imazapic (Cadre/Impose)

• 2,4-DB (Butyrac/Butoxone)

www.gaweed.com