1 / 22

Evaluation of K4 for Weed Control in Sandland Sugarcane

Evaluation of K4 for Weed Control in Sandland Sugarcane. C. Rainbolt, L. Baucum, and I. Ezenwa. Introduction. K4 herbicide is a commercial mixture of hexazinone and diuron Preemergence herbicide with some post activity Registered for use in Florida sugarcane in 2005

kaden-craft
Download Presentation

Evaluation of K4 for Weed Control in Sandland Sugarcane

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Evaluation of K4 for Weed Control in Sandland Sugarcane C. Rainbolt, L. Baucum, and I. Ezenwa

  2. Introduction • K4 herbicide is a commercial mixture of hexazinone and diuron • Preemergence herbicide with some post activity • Registered for use in Florida sugarcane in 2005 • From the label “Do not use DuPont™ K-4™ on gravelly or rocky soils, thinly covered subsoils, or coarse-textured soils (sands to sandy loams) with less than 1% organic matter”

  3. Situation and Objective • Previous research with K4 in FL has focused on muck soils • Based on chemical and soil properties, ideal use rates will likely differ • Objective: determine optimum use patterns and rates for weed control and crop safety on sandland sugarcane

  4. Methods • 5 trials were established on sandland cane in 2005 • Trial 1- Duda, CP84-1198 ratoon • Trial 2- Paige Farms, CP84-1198 ratoon • Trial 3- ALICO, CP84-1198 plant • Trials 4 & 5- USSC, CL88-4730 ratoon • Plots were 4 rows wide x 40 ft long

  5. Treatments

  6. Duda Moore Haven • Application information • Preemergence: December 29, 2005 • Crop stage: emerging • Weeds: emerging • Postemergence: February 1, 2006 • Crop stage: 3-4 inch TVD • Weeds: common ragweed, purple nutsedge, spiny amaranth, dayflower, torpedograss, and bermudagrass

  7. Duda Moore HavenPRE Results • 14 days after PRE treatment (DAPRE), crop injury was 3 to 5% with all Valor and K4 treatments • 34 DAPRE control of tropical crabgrass was 84 to 94% with all PRE treatments except Valor • 34 DAPRE all treatments controlled spiny amaranth 83 to 95%

  8. Duda Moore Haven Results- 26 days after post treatments (DAPO) • Control of tropical crabgrass was 85 to 95% with K4 and Prowl H2O + Aatrex applied PRE • Treatments with K4 at 2 or 3 lbs/A POST controlled tropical crabgrass 95% or better • Crop injury was 20% or higher with Valor applied POST and 5 to 15% with K4 applied POST • Control of spiny amaranth was 90% or greater with all treatments except K4 at 1 lb/A PRE and Prowl H2O alone

  9. Control K4 at 3 lbs/A 26 DAPOST

  10. Paige Farms • Application information • Preemergence: January 31, 2006 • Crop stage: emerging • Weeds: emerging • Postemergence: March 1, 2006 • Crop stage: 3-4 inch TVD • Weeds: fall panicum, American black nightshade, and common ragweed

  11. Paige FarmsPRE Results – 27 DAPRE • Control of fall panicum was 60, 78, and 90% with K4 1, 2, and 3 lbs/A, respectively • Control of fall panicum with Prowl H2O was 79% • Crop injury with K4 ranged from 0 to 10% and increased with higher rates • American black nightshade and common ragweed control were not significantly different between treatments

  12. Paige Farms Results- 41 DAPO • Control of fall panicum with PRE treatments was highest (85%) with K4 at 2 and 3 lbs/A • Fall panicum control with POST treatments was highest with treatments containing K4 at 2 and 3 lbs/A • Crop injury averaged 10% with treatments containing 3 lbs of K4 and 5% with 2 lbs of K4

  13. Paige Farms 41 DAPO Control POST- K4 at 3 lb/A + Surfix POST- Aatrex at 4 lbs/A PRE- K4 at 3 lbs/A + NIS

  14. ALICO • Application information • Preemergence: March 1, 2006 • Crop stage: emerging • Weeds: emerging • Postemergence: March 27, 2006 • Crop stage: 4-5 inch TVD • Weeds: southern crabgrass and common purslane

  15. ALICOResults – 26 DAPRE • Control of southern crabgrass was highest (88 to 89%) with K4 at 2 and 3 lbs/A and Prowl H2O+ Aatrex • Common purslane control was 80% or better with all treatments except Valor • Crop injury averaged 5 to 9% with K4 at 2 and 3 lbs/A and Valor

  16. ALICO Results- 15 DAPO • Control of southern crabgrass was still above 80% with PRE applications of K4 at 2 and 3 lbs/A and Prowl H2O + Aatrex • POST treatments were too late for successful southern crabgrass control (best control was 65% with K4 at 3 lbs/A alone and + Unison • Crop injury was 11 to 20% with all K4 treatments

  17. USSC • Application information • Preemergence: April 14, 2006 • Crop stage: emerging • Weeds: emerging • Postemergence: May 1, 2006 • Crop stage: 4-5 inch TVD • Weeds: fall panicum, purple nutsedge, spiny amaranth • Two trials were conducted in adjacent fields • PRE herbicide performance is negatively impacted by dry soils • One trial was irrigated with ~1 inch within 1 week of herbicide application

  18. USSC Results • Data collection and analysis not completed in time for presentation • A report including a full analysis of results from all locations will follow in late summer

  19. Conclusions • Crop injury tends to be more severe in plant cane and larger cane (>4” to TVD) • Crop injury may be more severe in warmer conditions when cane is growing faster • Results indicate that 2-3 lbs applied PRE or very early POST provides weed control similar or better than standard treatments

  20. Acknowledgements • Many thanks to: • Paige Farms • Duda • USSC • ALICO • DuPont

More Related