2011 beltwide tillage impacts reflex control of palmer amaranth
Sponsored Links
This presentation is the property of its rightful owner.
1 / 33

2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth. PowerPoint PPT Presentation


  • 83 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth.

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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

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

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

  • Reflex 1 pt + Prowl 1 pt

  • None

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


Application Methods

PRE after planting

PPI rototiller before planting

PPI field cultivator before planting

PPI disk harrow before planting

Spray immediately before strip till


  • Strip tillage rig


Rainfall/Irrigation

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


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


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


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


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


PRE

PPI-Rototiller

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment


PRE

PPI-Disk

Prowl (1 pt) + Reflex (1 pt)

30 days after treatment


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


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

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.

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

PRE

PPI


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


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

  • 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


  • Login