Mar 13, 2017

Crop Protection WCRC Croprotection-australia WCRC1
Abstract                                                                         Back to Table of contents

An extensive analysis of the total burden of endosulfan in cotton growing soils has been conducted over the past three years on four cotton fields in the Namoi valley of northern New South Wales. The study indicates that the maximum total burden of endosulfan residues, for analyses conducted at about 6-weekly intervals through the year, is usually not greater than a single application of endosulfan (750 g a.i./ha). This declines to lower levels at other times and particularly when cotton is rotated with wheat. There is no evidence that endosulfan residues are accumulating with current spraying rates; volatilisation is proposed to be a major cause of dissipation of endosulfan. Despite these findings, the concentrations of endosulfan in soil detected, particularly during the spraying season, are significant and could pose an environmental threat if transported off-farm in return waters.

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