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Summer 2009

Stewardship of Chlorpyrifos to Avoid Water Quality Issues

The following is a press release issued by Kandi Manhart, Outreach and Education, Colusa-Glenn Subwatershed Program.

Spring is gone.  Summer is here.  Therefore, the Colusa Glenn Subwatershed Program knows that it is time to use Chlorpyrifos (trade names include Dursban, Lorsban 4E, Lorsban 4E-HF, Whirlwind, Nufos 4E, Govern 4E, Chlorpyrifos 4E) on agricultural crops.  Application of these products may be by ground or air and include most tree crops and alfalfa.

For those of you who may not know, although hopefully you do, the Colusa Glenn Subwatershed Program is the local subwatershed program to help irrigated landowners meet requirements of the Irrigated Lands Regulatory Program (ILRP).  The ILRP is a mandated program through the California Regional Water Quality Control Board, Central Valley Region for growers within the Central Valley who have irrigation water and/or stormwater leaving their irrigated lands.

In an effort to keep our water quality issues at a minimum, we strongly encourage that handling and applications of this insecticide are according to the label.  Also, please utilize any and all Best Management Practices (BMPs) that are available.  For example, control drift when applied, do not over-apply, and most of all be aware that if an exceedance in run-off waters occur, then the local subwatershed program will be forced to conduct additional outreach to its participants using membership fees and will possibly encourage restrictive use of Chlorpyrifos

There were two exceedances of this nature in Glenn County within the Walker Creek Watershed area in 2007.  In response to the exceedances, we held a grower workshop in January 2008 and as required by the ILRP we have prepared a management plan.  Although in 2008 there were no exceedances, we still want to remind everyone of the importance to be very aware of the water quality issues this insecticide may cause if not handled or applied according to the label.

For more information in using Chlorpyrifos appropriately to reduce chances of an exceedance, please contact our office at (530) 934-8036 or your local Ag Commissioners office to receive Best Management Practice ideas. ■

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