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Simazine Residue Levels in Irrigation Water after Ditchbank Application for Weed Control¹

ABSTRACT

A field study was conducted to determine the amount of simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] likely to be found in irrigation water after ditchbank treatment for weed control. Resulting data are useful in evaluating the potential impact of simazine on crops irrigated from sprayed canals. Canals were selected in California, Colorado, and Washington for the application of simazine to both watered and dewatered sites at rates of 2.25 to 7.43 kg/ha. Simazine levels in flowing canal water immediately after herbicide application did not exceed 60 µg/liter. In first-flow samples collected in the spring from the sites that were dewatered at application, simazine levels peaked at about 250 µg/liter within the treated section but decreased rapidly to <5 µg/liter.

Key Words: aquatic weeds • herbicide dissipation • gas chromatography

¹ Contribution from the Aquatic Weed Control Res. Lab., SEA, Fed. Res., USDA, Denver, CO 80225. This paper reports the results of research only. Mention of a pesticide in this paper does not constitute a recommendation by the USDA nor does it imply registration under FIFRA. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the USDA and does not imply its approval to the exclusion of other products that may also be suitable.

² Plant Physiologist, Botanist, Biological Sciences Technician, and Chemist, respectively.

Received for publication March 13, 1978.