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Summer 2011

BMPs for Chlorpyrifos... Use Them!

Spring has come and 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 by now, 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. Most of all be aware that if additional exceedances in run-off waters occur, then the local subwatershed program may…

~ be forced to conduct additional outreach to its participants using membership fees which could increase future membership fees
~ be forced to require individual farm management plans that could include individual water sampling
~ be forced to seek restrictions on the use of Chlorpyrifos in Glenn County

There were two exceedances of Chlorpyrifos within the Walker Creek Watershed area in 2007. And, there was another exceedance of Chlorpyrifos in July 2009. In response to these exceedances, grower workshops have been held, a management plan created, and outreach performed as it is required by the ILRP. The Colusa Glenn Subwatershed Program will continue 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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