Effects of selected pre-emergence herbicide-treated oil palm residues on goosegrass emergence and growth

Tse-Seng Chuah,Win-Kent Lim

doi:10.51694/advweedsci/2021;39:00008

Abstract

Background Goosegrass, one of the problematic weeds in the world. Various herbicides have been widely employed for goosegrass control. However, heavy reliance upon the herbicides has led to the evolution of herbicide-resistant biotypes of goosegrass. Diversified approach is needed for sustainable management of goosegrass. Objective Evaluate the phytotoxicity of selected preemergence herbicide-treated oil palm residue powders on goosegrass emergence and growth. Methods A glasshouse experiment was arranged as complete randomized design with five replications. The oil palm residue powders; [...]

Highlights

Goosegrass (Eleusine indica) is one of the most troublesome weeds in the world (Holm et al, 1997) and is commonly found in vegetable farms, orchards, immature oil palm plantations (Chuah and Ismail, 2010) and aerobic rice fields (Chauhan, 2012)
This study aimed to evaluate the effect of oil palm residues incorporated with selected preemergence herbicides on seedling emergence and growth of goosegrass
When the rate of oil palm residue powder was increased from 1.5 to 3.0 t ha-1, the seedling emergence was inhibited by 60-70%

Summary

Introduction

Goosegrass (Eleusine indica) is one of the most troublesome weeds in the world (Holm et al, 1997) and is commonly found in vegetable farms, orchards, immature oil palm plantations (Chuah and Ismail, 2010) and aerobic rice fields (Chauhan, 2012). Objective: Evaluate the phytotoxicity of selected preemergence herbicidetreated oil palm residue powders on goosegrass emergence and growth. The oil palm residue powders; leaflet (OPL), rachis (OPR) or frond (OPF, leaflet + rachis) were treated with preemergence herbicides, viz S-metolachlor, oxyfluorfen or thiobencarb at their respective ED50 rates (rate that gives 50% inhibition) and applied as mulches. Results: The ED97 value (rate that causes 97% inhibition) of S-metolachlor for growth of goosegrass was reduced by more than 90% when being mixed with the oil palm residue powders. The oxyfluorfen-treated oil palm residue powders and thiobencarb-treated OPL or OPR powders provided lower inhibitory effect on the goosegrass. Conclusions: Oil palm residues of leaflets, rachis and fronds have potential to reduce rate of preemergence herbicide to inhibit goosegrass seedling emergence and growth depending on herbicide choice and parts of oil palm frond used

Objectives

Methods

Results