Kover Trial Proves Effective in Enhancing Pre-Emergent Herbicide Performance

A recent trial conducted in Hastings has delivered promising results for Kover, an adjuvant designed to enhance the efficacy of pre-emergent herbicides.

Overseen by Horticulture Technical Advisor Andre Lubbe and Biolchim Territory Manager, Johan Lubbe (Andre’s son), the trial demonstrated Kover’s ability to significantly improve the effectiveness of Stomp (pendimethalin), a pre-emergent herbicide supplied by BASF Agricultural Solutions.

Trial Overview

The trial took place in a leek crop grown by Gourmet Blueberries in Hastings, with the aim of assessing the impact of Kover on the performance of Stomp. The study applied Kover at three different rates in conjunction with Stomp, alongside a control treatment of Stomp alone. Results showed that Kover significantly extended the herbicide’s efficacy across different soil types.

Key Findings

The combination of Kover and Stomp Xtra (pendimethalin) proved effective in reducing weed counts across both peat and sedimentary/sandy soils. Specific observations included:

• Peat Soil: The higher organic matter content likely enhanced the treatment’s effectiveness, with increased soil moisture and nutrient availability supporting improved herbicide action.

• Sedimentary/Sandy Soil: While the results were more moderate, the combination still provided notable reductions in weed populations, demonstrating its broad applicability across different soil types.

Kover improved herbicide retention, reduced the potential for leaching, and alleviated weed stress, making it a valuable addition to pre-emergence herbicide applications..

Recommended Application

For general use across all soil types, a 1.5L Kover rate is recommended. This rate delivered the most consistent weed reduction, offering a balanced approach that ensured effective weed control without the risk of overapplication.

The success of this trial highlights the potential of Kover in improving weed management strategies, and ongoing trials will continue to build knowledge around its use in New Zealand horticulture.  

Talk to your local Farmlands Technical Advisor to see if Kover is right for your crop.