2012: How Tillage and Application Timing of Reflex Affects Palmer Amaranth Control J. M. Kichler 1, and A. S. Culpepper 1 1 University of Georgia Cooperative.

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Presentation transcript:

2012: How Tillage and Application Timing of Reflex Affects Palmer Amaranth Control J. M. Kichler 1, and A. S. Culpepper 1 1 University of Georgia Cooperative Extension

Tillage is now a common scene

Percent control of Palmer amaranth by Reflex as impacted by tillage. 38 DAP.* 80 B 91 A 3 C Prowl 1 pt/A + Reflex 1 pt/A strip-tillfield cultivator rototiller 75 B disk

PPI- shallow incorporation Prowl (1 pt) + Reflex (1 pt) 30 days after treatment PPI-Disk

Tillage in Cotton During 2010 %PPI tillageGA Counties # Worth, Pulaski, Tift, Berrien, Echols, Turner, Brooks, Pierce, Marion, Grady, Emanual, Montgomery, Atkins, Coffee, Lowndes, Dooly, Wilcox, Thomas, Crisp, Schley, Webster, Colquitt Bullock, Jefferson, Treutlen, Wheeler, Daugherty Effingham, Telfair, Tattnall, Dodge, Toombs, Jeff Davis, Bleckly, Early, Lanier, Irwin, Lee, Macon 13 >50Jenkins, Johnson, Washington, Screven, Wayne, Laurens, Randolf, Decatur, Seminole, Miller, Taylor Ben Hill 12

Percent Palmer Amaranth control with Reflex PPI and PRE in A 79 B 98 A Irrigated Dryland

Reflex: Soil moist at planting; rainfall 13 DAT. PPIPRE

Cotton injury is a big concern for growers!!

Irrigated May 13 Planted May 14 Irrigated May 19 during emergence NoneProwl + Reflex PRE Prowl + Reflex PPI - Rototill

Objective To determine if PRE, PPI or PRE and PPI split applications (PPI fb PRE) of Reflex has an impact on Palmer amaranth control.

Materials and Methods Tift County Plot Size 6 by 25 feet Replicated 4 times Randomized Complete Block Design DP 1050 BRF 10 Treatments

Application Methods PPI with a field cultivator before planting PRE immediately after planting Irrigated (no irrigation or rainfall for 7 DAT)

Herbicide Treatments: Comparison 1 PPI Options: – Prowl + Reflex 1 pt/A – Prowl + Reflex 1.5 pt/A PRE Options: – Prowl + Reflex 1 pt/A – Prowl + Relfex 1.5 pt/A Split (PPI fb PRE) – Prowl + Reflex 0.5 pt/A fb Reflex 0.5 pt/A – Prowl + Reflex 0.75 pt/A fb Reflex 0.75 pt/A

Percent cotton injury with Reflex PPI, PRE, or Split Applied at 12 DAT. 2 D Prowl H2O 2 pts/A included with all treatments. 5 C 15 A 5 C

Percent Palmer Amaranth control with Reflex PPI, PRE, or Split Applied at 35 DAT. 60 D 72 C 81 B Prowl H2O 2 pts/A included with all treatments. 98 A 95 A

Non-treated

Prowl + Reflex 1 pt PPI

Prowl + Reflex 1 pt PRE

Prowl + Reflex ½ pt fb ½ pt Split Application

Herbicide Treatments: Comparison 2 Split (PPI fb PRE) – Prowl + Reflex 0.75 pt/A fb Reflex 0.5 pt/A – Prowl + Reflex 0.75 pt/A fb Reflex 0.75 pt/A – Prowl + Reflex 1 pt/A fb Reflex 0.5 pt/A – Prowl + Reflex 0.75 pt/A fb Reflex 0.5 pt/A + diuron

Percent cotton injury with Reflex Split Applied at 12 DAT. 0 B Prowl H2O 2 pts/A included with all treatments.

Percent Palmer control with Reflex Split Applied at 35 DAT. 95 A96 A 99 A Prowl H2O 2 pts/A included with all treatments.

Percent Palmer control with Reflex Split Applied at 35 DAT. 95 A96 A 99 A Prowl H2O 2 pts/A included with all treatments.

Conclusions In irrigated production, PRE applications are more effective if injury is not a concern. In dryland production, the split applications give you the best of both worlds.

Any Questions?