Post-emergent Demonstration Report

Demonstration and evaluation of new and existing against Post-emergent broadleaf weed herbicides in wheat.

Hines Hill, WA, 2019

INTRODUCTION

A demonstration site was sown in Hines Hill on the 16th of May 2019, to demonstrate to the extended David Grays Aglink network the efficacy of new and existing post-emergent broadleaf weed herbicides in wheat. The break of season was on the 7th of June with 16mm rain, treatments were applied on the 22nd of July, radish at 4-6 leaf stage (Zadok GS 13-15).

Objective

Demonstrate and evaluate the efficacy and crop safety of new and existing post-emergent herbicides in wheat.

METHODOLOGY

Data Analysis

All data analysis in this report was conducted using Microsoft Excel. Simple means, analysis of variance was used to determine statistical significance using the least significant difference method with a 95% confidence interval.

RESULTS

Figure 1. Average percentage brownout for post-emergent treatments across 3 assessment dates.

7, 14 and 57 DAT indicated brownout percentages of 60%, 68% and 97% respectively.

Statistical analysis using a standard ANOVA, indicated there was significant difference between treatments (P< 0.001).

Figure 2. Phytotoxicity percentage leaf area incidence, 14 DAT.

Figure 3. Yield data, harvested 11th November 2019. Expressed as kg/ha.

DISCUSSION/CONCLUSION

All post-emergent treatments achieved adequate brownout of radish.

Velocity + LVE provided excellent radish control. Assessments at 7, 14 and 57 DAT indicated brownout percentages of 68%, 65% and 97% respectively. The results seen in the demonstration are in line with current data and infield confirmations of how well Velocity performs. Precept had lower brownout ratingsachieving 60% brownout by 57 DAT assessments.

Phytotoxicity incidence were below 5% leaf area affected for both Velocity + LVE and Precept, effects were transient and subsided by the 57 DAT assessment.

The late start and dry year, lead to lower than average yields. There was no significant difference between treatments, however; there were numerical variances. The average highest yields were Condor, Flight, and Talinor + LVE, averaging 667, 639 and 611kg/ha respectively. Due to the dry season, in this demonstration rain was a limiting factor, thus results are not conclusive and only act as a representation of the seasons conditions and not as a solid foundation for recommendations.

APPENDICES

Growing season rainfall for Hines Hill

Pre spray pressure 22 July 2019

7 DAT

57 DAT