Post-emergent Herbicides for the Control of Wild Radish

Efficacy and crop safety of post-emergent herbicides, in the control of 2-8 leaf Wild Radish

Dumbleyung, WA, 2018

Summary

Wild radish (Raphanusraphanistrum) is a highly competitive broad leafweed (BLW) across the majority of Western Australia’s cropping land. Yieldlosses of up to 90% can be seen in heavily infested crops. A trial site wasestablished in Dumbleyung WA, where BLW weed seeds were spread to emulate ahigh pressure weed burden.

This trial aimed to demonstrate to theextended David Grays network a number of post emergent herbicide options forthe control of various broadleaf weeds (Radish, Canola, Capeweed). BASF’s newproduct Frequency (standalone group H) was compared to its market competitorsTalinor and Velocity. Frequency performed equally as well against Radish andCanola, however lagged behind against Capeweed.

Methodology

Herbicide Treatments

Trial Design

Site, Crop and Application Details

Assessment Methods

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: Combined % control of Radish, Canola & Capeweed

Excellent control was achievedacross the board with Defcon and standalone MCPA the exceptions. The site hasstrong healthy clays and the season was stress free with consistent rainfall.Hence, most products perform well.

Frequency is shown to be lagging behindTalinor and Velocity slightly with both MCPA and Bromxynil tank-mix partners.Please note that this is as a result of poorer capeweed control with 100%control achieved for Radish and Canola and 75% control achieved for capeweed.

The EPE application of Gallery showed promise with not a single weed germinate throughout the season.

Herbicide resistance test

Resistance tests 3 weeks after treatment found a Wild Radish sample to exhibit weak resistance to Ally and Logran (Group B – Sulfonylureas) and no resistance to Brodal and MCPA.

Conclusion

Excellent performance seen across the boarddue to strong soils and conducive seasonal conditions. Frequency performed wellon Radish and Canola however seemed to struggle a bit with capeweed. Possibly aweakness?

Gallery applied EPE proved encouraging especially with the recent uptake of prosulfocarb applied EPE. The combination could provide season long control allowing focus to be shifted to correct application timing of fertilizer and fungicide.

Appendix

Site Rainfall

Photos