2011 beltwide tillage impacts reflex control of palmer amaranth
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2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth. Kichler, Culpepper, Sosnoskie, and York University of Georgia and N. C. State University. Irrigated or Dryland. Macon Co. = X % in 2010. OBJECTIVE.

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2011 beltwide tillage impacts reflex control of palmer amaranth

2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth.

Kichler, Culpepper, Sosnoskie, and York

University of Georgia and N. C. State University

slide3

Irrigated

or

Dryland

objective
OBJECTIVE

Determine the impact of a rototiller, a field cultivator, and a disk harrow on the activity of Reflex.

Three scenarios:

Activating rainfall (irrigated production)

Moist soil but no activating rain

Bone dry

experiment 1 irrigated
Experiment 1: Irrigated

Tift County: Palmer response study

Tift County: Weed free tolerance study

Plot Size – 6 by 70 feet

Three Replications, RCBD

PHY 375 WRF

Weed free study using Ignite

herbicide treatments and rates
Herbicide Treatments and Rates
  • Reflex 1 pt + Prowl 1 pt
  • None

Reflex is only currently labeled as a PRE application in Georgia cotton.

application methods
Application Methods

PRE after planting

PPI rototiller before planting

PPI field cultivator before planting

PPI disk harrow before planting

Spray immediately before strip till

rainfall irrigation
Rainfall/Irrigation

Planted May 14

Irrigated May 13 (0.5 inch)

Irrigated May 19 (0.5 inch)

slide14

Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 DAP.*

99 a

95 ab

89 bc

85 c

71 d

rototiller

field cultivator

disk

strip-till

PRE

Prowl 1 pt/A + Reflex 1 pt/A

slide19

Percent control of Palmer amaranth by Reflex as impacted by tillage. 38 DAP.*

99 a

91 b

80 c

75 c

3 d

rototiller

field cultivator

disk

strip-till

PRE

Prowl 1 pt/A + Reflex 1 pt/A

slide21

PRE

PPI-Rototiller

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment

slide22

PRE

PPI-Disk

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment

slide24

Percent cotton injury by Reflex as impacted by tillage. 10 DAP.*

20 a

9 b

6 bc

4 bc

0 c

rototiller

field cultivator

disk

strip-till

PRE

Prowl 1 pt/A + Reflex 1 pt/A

slide25

None

Prowl + Reflex PRE

Planted May 14

Irrigated May 13

Irrigated May 19 during emergence

Prowl + Reflex PPI - Rototill

slide26

Experiment 2: Soil moist but no limited activating moisture.

←Cotton Emergence April 29

April 15 – 0.75 inches

April 21 – 0.2 inches

April 23 – 0.4 inches

May 5 – 0.25 inches

May 6 – 0.75 inches

May 7 – 0.25 inches

May 10 – 0.75 inches

May 17 – 0.75 inches

May 28 – 1.4 inches

← Planted April 23

experiment 2 soil moist but no limited activating moisture
Experiment 2: Soil moist but no limited activating moisture.

Herbicide options = none or Reflex 1 pt/a

  • Tillage: PRE or Rototill
slide28

Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 and 28 DAP.*

14 DAP

28 DAP

95 a

93 a

87 b

79 b

PPI

PRE

PPI

PRE

Reflex 1 pt/A

slide29

Reflex

PRE

PPI

experiment 2 soil moist but no limited activating moisture1
Experiment 2: Soil moist but no limited activating moisture.

Herbicide options = none or Reflex 1 pt/a

  • Tillage: PRE or Rototill
slide32

Percent control of Palmer amaranth by Reflex as impacted by tillage. 17 and 29 DAP.*

14 DAP

35 DAP

98

96

98

92

PPI

PRE

PPI

PRE

Reflex 1 pt/A

slide33

Conclusions

  • Irrigated/Rainfall timely: PRE applications are the most effective option; however, crop injury could be reduced with a shallow incorporation that only reduced control 9%.
  • Moist soil/no activating rainfall: PPI shallow incorporation more effective than PRE application.
  • Bone dry soil: Control was similar with PRE or PPI applciation because Palmer did not emerge until it rained.
  • Rototiller > Field Cultivator > Strip till > Disk
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