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


Irrigated amaranth.

or

Dryland



Objective
OBJECTIVE amaranth.

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 amaranth.

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 amaranth.

  • Reflex 1 pt + Prowl 1 pt

  • None

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


Application methods
Application Methods amaranth.

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 amaranth.

Planted May 14

Irrigated May 13 (0.5 inch)

Irrigated May 19 (0.5 inch)


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


Nontreated – 11 DAT tillage. 14 DAP.*





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


Ho Herbicide tillage. 38 DAP.*


PRE tillage. 38 DAP.*

PPI-Rototiller

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment


PRE tillage. 38 DAP.*

PPI-Disk

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment



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


None DAP.*

Prowl + Reflex PRE

Planted May 14

Irrigated May 13

Irrigated May 19 during emergence

Prowl + Reflex PPI - Rototill


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


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


Reflex tillage. 14 and 28 DAP.*

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


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


Conclusions tillage. 17 and 29 DAP.*

  • 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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