Optimizing efficacy of acetochlor + atrazine and dicamba at various doses to manage Conyza stricta L. in sugarcane

Arif Hussain,Asif Tanveer,Abdul Aziz Khakwani ,Ejaz Ahmad Khan ,Mohammad Safdar Baloch

doi:10.1590/s0100-83582020380100080

Arif Hussain, Asif Tanveer + Show 3 more

Open Access

https://doi.org/10.1590/s0100-83582020380100080

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Abstract

Abstract Background: Conyza stricta L. (Horse weed) is an annual problematic weed in an agricultural ecosystem and considerably decreases the crop yield and quality. Objective: To determine the most effective pre and post emergence herbicides and their dose to control C. stricta in sugarcane crop. Methods: A two years field study comprised of six herbicides treatments along with weedy check and hand weeding. The design of study was RCBD with three replications. Results: Hand weeding recorded more leaf area index (LAI), crop growth rate (CGR) and net assimilation rate (NAR), biological and stripped yield. However, greater LAI, CGR and NAR, biological and stripped yield were recorded by acetochlor + atrazine at the rate of 2,715 g ha-1 (pre emergence) and dicamba at the rate of 466 g ha-1 (post emergence). All the treatments produced statistically comparable harvest index except weedy check, which produced less harvest index. Minimum C. stricta density and dry weight were recorded for acetochlor + atrazine at the rate of 2,715 g ha-1 and dicamba at the rate of 466 g ha-1. Acetochlor + atrazine at the rate of 2,715 g ha-1 (pre emergence) and dicamba at the rate of 466 g ha-1 (post emergence) gave better C. stricta control with high herbicides efficiency index. Conclusion: Acetochlor + atrazine at the rate of 2,715 g ha-1 (pre emergence) or dicamba at the rate of 466 g ha-1 (post emergence) may be used for efficient control of C. stricta in sugarcane.

Highlights

Sugarcane (Saccharum officinarum L.) is grown successfully in the tropics and subtropics of the world (Zhao and Li, 2015)
Outcomes showed that maximum leaf area index (LAI), crop growth rate (CGR) and net assimilation rate (NAR) of sugarcane were recorded in hand weeding practice while the lowest values were observed in weedy check plots
Pre-emergence herbicide, acetochlor + atrazine at the rate of 2,715 g ha-1 and post emergence significantly improved LAI, CGR and NAR followed by acetochlor + atrazine at the rate of 1,810 g ha-1 and dicamba at the rate of 349.50 g ha-1

Summary

Introduction

Sugarcane (Saccharum officinarum L.) is grown successfully in the tropics and subtropics of the world (Zhao and Li, 2015). In Pakistan, sugarcane is an important cash crop after cotton and it has significant importance for sugar based industries of the country (Anonymous, 2018). Greater LAI, CGR and NAR, biological and stripped yield were recorded by acetochlor + atrazine at the rate of 2,715 g ha-1 (pre emergence) and dicamba at the rate of 466 g ha-1 (post emergence). Acetochlor + atrazine at the rate of 2,715 g ha-1 (pre emergence) and dicamba at the rate of 466 g ha-1 (post emergence) gave better C. stricta control with high herbicides efficiency index. Conclusion: Acetochlor + atrazine at the rate of 2,715 g ha-1 (pre emergence) or dicamba at the rate of 466 g ha-1 (post emergence) may be used for efficient control of C. stricta in sugarcane

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