Responses of Four Types of Winter Wheat to Fenoxaprop-p-ethyl

Kimberly D Belfry,Peter H Sikkema

doi:10.4236/as.2015.62018

Abstract

Fenoxaprop-p-ethyl is a selective grass herbicide that if registered will provide winter wheat growers with an additional weed control option. Field experiments were established in the fall of 2011, 2012 and 2013 at Ridgetown and Exeter, Ontario, to determine the sensitivity of four market classes of winter wheat [Soft white winter wheat (SWWW), soft red winter wheat (SRWW), hard white winter wheat (HWWW) and hard red winter wheat (HRWW)] to 1X and 2X fenoxaprop-p-ethyl/safener at early-(EPOST) or late-post emergence (LPOST) application timings. Fenoxaprop-p-ethyl/safener applied LPOST at 1X and 2X the manufacturer’s proposed label rate caused 4% and 5% injury 1 week after application (WAA), respectively. The injury observed was transient with 1% injury 2 WAA. Winter wheat height ranged from 91 to 95, 76 to 77, 76 to 79 and 90 to 93 cm while grain yield was 6.2 to 6.4, 6.1 to 7.1, 5.5 to 5.8 and 5.6 to 6.2 t?ha?1 for SWWW, SRWW, HRWW and HRWW, respectively. Exeter sites were not affected by fenoxaprop-p-ethyl/ safener treatment. At Ridgetown and Exeter, no market class-specific response was identified for the cultivars evaluated. Based on this study, fenoxaprop-p-ethyl/safener has the potential to cause only minor and transient injury in winter wheat that will not decrease yield. Furthermore, this research supports the registration of fenoxaprop-p-ethyl/safener for spring POST application in winter wheat in Ontario.

Highlights

With over 700,000 hectares seeded annually, winter wheat (Triticum aestivum L.) is one of Canada’s most im-How to cite this paper: Belfry, K.D. and Sikkema, P.H. (2015) Responses of Four Types of Winter Wheat to Fenoxaprop-pethyl
The objective of this study was to assess the tolerance of Soft white winter wheat (SWWW), soft red winter wheat (SRWW), hard white winter wheat (HWWW) and hard red winter wheat (HRWW) to fenoxaprop-p-ethyl/safener applied at 1X and 2X rates at early- and late-post emergence (POST) application timings, under Ontario growing conditions
Ridgetown and Exeter locations were analyzed separately due to a significant environment by main effect interaction

Summary

Introduction

With over 700,000 hectares seeded annually, winter wheat (Triticum aestivum L.) is one of Canada’s most im-How to cite this paper: Belfry, K.D. and Sikkema, P.H. (2015) Responses of Four Types of Winter Wheat to Fenoxaprop-pethyl. Winter wheat is seeded in the fall in narrowly spaced rows that enable this competitive crop to suppress weeds, while its fibrous roots help to maintain soil structure and prevent erosion due to wind and water [3]. This sustainable crop fits well into reduced- and no-till systems and has the potential to produce yields that are upwards of 30% higher than spring wheat if managed properly [4]. Given the potential of this fall-seeded cereal, market class and cultivar selection are important considerations when trying to maximize winter survival, quality, yield and profitability

Objectives

Methods

Results

Conclusion