NIGHTSHADE CONTROL WITH PYRITHIOBAC SODIUM (STAPLE) IN CALIFORNIA COTTON
Mar 10, 2017

Agronomy & physiology WCRC Agro-Physio-north-america WCRC1
Abstract                                                                         Back to Table of contents

The control of nightshade species with pyrithiobac Sodium at rates up to 210 liters/ha with and  without fluazifop, methanearsonate, and surfactants were examined from 1991-1993.  Phytotoxicity  to Acala cotton was also evaluated.

Control of nightshade levels 50 to 60 days after treatment ranged from 90 to 100%, with 100% control normally occurring at the 28.5 to 42.5 g ai/hg rate applied either singly or in a  sequential application.  When pyrithiobac sodium was tank mixed with either fluazifop or  monosodium methanearsonate control remained excellent.  Grass control was unaffected.

Cotton injury was evident four to five days after treatment.  Symptoms included mottled yellowing and  crinkling of leaves, but the cotton plant outgrew these symptoms within 30 to 40 days.  Symptoms  were greater and persist longer with higher rates.  Acala varietal screening indicated no adverse  effect to yield.

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