Effect of Method of Application, Herbicide Rate and Cultivar on Processing Pea Tolerance to Saflufenacil

Darren E Robinson,Kristen Mcnaughton

doi:10.5539/jas.v13n8p46

Abstract

The purpose of this work was to determine the effect of method of application, herbicide rate and cultivar on tolerance of processing pea tolerance to saflufenacil. Two field experiments were established to address this&mdash;each experiment was conducted over a 3-year period. The first experiment, conducted in 2014, 2015 and 2016, was arranged in a split-plot design with method of application (pre-plant incorporation (PPI) or preemergence (PRE)) as the main plot factor, and saflufenacil rate (0, 75 and 150 g ai ha-1) as the subplot factor. Pea (Pisum sativum L.) was not injured, and dry matter, pea tenderness and yield were not less than the untreated check when saflufenacil was applied either PPI or PRE, at 75 and 150 g ai ha-1 of the herbicide. The second experiment was conducted from 2017 to 2019, at two locations each year; each repetition of this experiment was arranged in a factorial design to determine the effect of two factors on processing pea: saflufenacil rate (0, 75 and 150 g ai ha-1) and cultivar. Saflufenacil did not cause more than 5% visible injury to pea, nor did it reduce pea dry matter, tenderness or marketable yield of the eight cultivars included in the experiment. Application method, saflufenacil rate and cultivar did not affect pea tolerance across a wide range of soil and environmental conditions. Registration of saflufenacil in processing pea would significantly improve growers&rsquo; options for control of Group 2 resistant broadleaf weeds such as common lamb&rsquo;s-quarters (Chenopodium album L.), eastern black nightshade (Solanum ptycanthum Dunal.) and common ragweed (Ambrosia artemisiifolia L.).

Highlights

In the province of Ontario, succulent field pea (Pisum sativum L.) grown for the canning and frozen pea markets offers field crop growers an opportunity to diversify farm operations and increase overall profit on farm
Pea response to soil applications of saflufenacil was combined over years and locations, as there were no interactions between random effects of year and fixed effects of application method or herbicide rate
The purpose of this work was to determine how method of application, saflufenacil rate, and pea cultivar affected the tolerance of processing pea to saflufenacil

Summary

Introduction

In the province of Ontario, succulent field pea (Pisum sativum L.) grown for the canning and frozen pea markets offers field crop growers an opportunity to diversify farm operations and increase overall profit on farm. The most problematic weeds pea growers must control are annual broadleaf weed species This includes species such as eastern black nightshade (Solanum ptycanthum Dunal.), common lamb’s-quarters (Chenopodium album L.) and common ragweed (Ambrosia artemisiifolia L.). These weeds can reduce yield of pea as much as 67%, interfere with harvest, and in extreme circumstances result in results in not harvesting some fields (Lutman et al, 1994; Townley-Smith & Wright, 1994). The prevalence of annual broadleaf weed species resistant to ALS-inhibiting herbicides (i.e., Group 2 herbicides) provides a basis for including herbicides with alternate modes-of-action that are capable of controlling these problematic weeds as part of a management strategy

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