Callisto Performance Callisto Performance in Georgia - 2001in Georgia - 2001

Eric P. ProstkoEric P. Prostko

Extension Weed SpecialistExtension Weed Specialist

University of GeorgiaUniversity of Georgia

Corn Production in GeorgiaCorn Production in Georgia

345,000 A harvested345,000 A harvested 57% irrigated57% irrigated 43% dryland43% dryland 1993-2000 Avg yields1993-2000 Avg yields

* 137 Bu/A - irrigated* 137 Bu/A - irrigated

* 64 Bu/A - dryland* 64 Bu/A - dryland

* 14 tons/A - silage* 14 tons/A - silage

Source: GASS

Top 10 Most Troublesome Top 10 Most Troublesome Weeds in Georgia CornWeeds in Georgia Corn

Texas panicumTexas panicum sicklepodsicklepod morninggloriesmorningglories pigweedspigweeds nutsedgesnutsedges

cockleburcocklebur beggarweedbeggarweed crabgrasscrabgrass johnsongrass johnsongrass PA smartweedPA smartweed

Webster and MacDonald, 1999

2001 Callisto Trials in Georgia2001 Callisto Trials in Georgia

2 locations2 locations small plot small plot

techniquestechniques crop injurycrop injury weed efficacyweed efficacy corn yieldscorn yields

RESULTSRESULTSTest 1Test 1TiftonTifton

Sicklepod Control with CallistoSicklepod Control with Callisto (3 oz/A) Applied POST - 8 DAT (3 oz/A) Applied POST - 8 DAT

66

90

0

20

40

60

80

100

Callisto + COC + UAN Atrazine + Accent + COC

Treatment

Con

trol

(%

)

Planted: April 9 (Pioneer 3163)Applied: April 23CASOB = 0.5”

b

aP = 0.05

Texas Panicum Control with CallistoTexas Panicum Control with Callisto (3 oz/A) Applied POST (3 oz/A) Applied POST

5158

13

65

0

20

40

60

80

Callisto + COC + UAN Atrazine + Accent + COC

Treatment

Con

trol

(%

)

8 DAT

51 DAT

P = 0.05

Planted: April 9 (Pioneer 3163)Applied: April 23PANTE = 0.5”

abab a

b

Corn Yield with Callisto (3 oz/A) Corn Yield with Callisto (3 oz/A) Applied POSTApplied POST

106

137

165

0

30

60

90

120

150

180

Untreated Callisto + COC + UAN Atrazine + Accent +COC

Treatment

Con

trol

(%

)

Planted: April 9 (Pioneer 3163)Applied: April 23Harvested: August 23

P = 0.1011

RESULTSRESULTSTest 2Test 2

AttapulgusAttapulgus

Texas Panicum Control with Callisto Texas Panicum Control with Callisto (6 oz/A) Applied PRE (6 oz/A) Applied PRE

78 74

59

5

8190

63

50

20

40

60

80

100

18 DAT 25 DAT 39 DAT 73 DAT

Inju

ry (

%)

Dual+Callisto Dual+Callisto+Atrazine

Planted: April 2 (DK 662RR)PRE: April 2

(LSD 0.05 = 7) (LSD 0.05 = 10) (LSD 0.05 = 10) (LSD 0.05 = 21)

Corn Yield with Callisto (6 oz/A) Corn Yield with Callisto (6 oz/A) Applied PRE Applied PRE

10394

109

134

0

40

80

120

160

Untreated Dual + Callisto Dual + Callisto+ Atrazine

Atrazine +Accent (POST)

Treatment

Bu/

A

Planted: April 2 (DK 662RR)PRE: April 2POST: April 20Harvested: August 27

LSD 0.10 = 29

Texas Panicum Control with CallistoTexas Panicum Control with Callisto(3 oz/A) Applied POST(3 oz/A) Applied POST

94

73

18

94

65

8

97

74

23

55

79

49

0

20

40

60

80

100

120

7 DAT 21 DAT 49 DAT

Inju

ry (

%)

Dual fb Callisto Bicep fb Callisto

Dual fb Callisto + Atrazine Atrazine + Accent

Planted: April 2 (DK 662RR)PRE: April 2 POST: April 20PANTE: 1-3”

(LSD 0.05 = 10) (LSD 0.05 = 10) (LSD 0.05 = 21)

Corn Yield with Callisto (3 oz/A) Corn Yield with Callisto (3 oz/A) Applied POST Applied POST

103116

102 100

134

0

30

60

90

120

150

Untreated Dual fbCallisto

Dual fbCallisto +Atrazine

Bicep fbCallisto

Atrazine +Accent

Treatment

Bu/

A

Planted: April 2 (DK 662RR)PRE: April 2POST: April 20Harvested: August 27

LSD 0.10 = 29

Callisto Summary - 2001Callisto Summary - 2001

no significant crop injury was no significant crop injury was observedobserved

Callisto did not provide acceptable Callisto did not provide acceptable control of Texas panicum and control of Texas panicum and sicklepod in Georgia.sicklepod in Georgia.

University ofGeorgia

ExtensionWeed Science

(gaweed.com)