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


2011 beltwide tillage impacts reflex control of palmer amaranth

Irrigated

or

Dryland


2011 beltwide tillage impacts reflex control of palmer amaranth

Macon Co. = X % in 2010


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


2011 beltwide tillage impacts reflex control of palmer amaranth

  • Strip tillage rig


Rainfall irrigation

Rainfall/Irrigation

Planted May 14

Irrigated May 13 (0.5 inch)

Irrigated May 19 (0.5 inch)


2011 beltwide tillage impacts reflex control of palmer amaranth

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


2011 beltwide tillage impacts reflex control of palmer amaranth

Nontreated – 11 DAT


2011 beltwide tillage impacts reflex control of palmer amaranth

Prowl 1 pt + Reflex 1 pt: PRE – 11 DAT


2011 beltwide tillage impacts reflex control of palmer amaranth

Prowl 1 pt + Reflex 1 pt: PPI with rototiller – 11 DAT


2011 beltwide tillage impacts reflex control of palmer amaranth

Prowl 1 pt + Reflex 1 pt: PPI with disk – 11 DAT


2011 beltwide tillage impacts reflex control of palmer amaranth

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


2011 beltwide tillage impacts reflex control of palmer amaranth

Ho Herbicide


2011 beltwide tillage impacts reflex control of palmer amaranth

PRE

PPI-Rototiller

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment


2011 beltwide tillage impacts reflex control of palmer amaranth

PRE

PPI-Disk

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment


2011 beltwide tillage impacts reflex control of palmer amaranth

Cotton injury from Reflex can be severe if rainfall occurs during emergence.


2011 beltwide tillage impacts reflex control of palmer amaranth

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


2011 beltwide tillage impacts reflex control of palmer amaranth

None

Prowl + Reflex PRE

Planted May 14

Irrigated May 13

Irrigated May 19 during emergence

Prowl + Reflex PPI - Rototill


2011 beltwide tillage impacts reflex control of palmer amaranth

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


2011 beltwide tillage impacts reflex control of palmer amaranth

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


2011 beltwide tillage impacts reflex control of palmer amaranth

Reflex

PRE

PPI


2011 beltwide tillage impacts reflex control of palmer amaranth

Experiment 3: Very dry soil, first rain 7 DAT.


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


2011 beltwide tillage impacts reflex control of palmer amaranth

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


2011 beltwide tillage impacts reflex control of palmer amaranth

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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