Education For Environmental Responsibility

Diazinon Insecticides

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Diazinon insecticides have been the standard practice for years to protect orchards from numerous overwintering pests. However, periods of heavy winter rainfall soon after dormant spray applications can potentially transport diazinon off-site to nearby streams and rivers, posing a risk to aquatic organisms.

Water quality monitoring throughout Central Valley waterways after winter storm events has detected diazinon at levels that exceed state standards.

In an effort to protect aquatic species and mitigate off-site movement, diazinon registrants have developed a series of management practices for use during dormant spray applications. The practices outlined in this publication are intended for use in counties and portions of counties located in the Sacramento and San Joaquin valleys below 1,000 feet elevation.

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