California acts to prohibit chlorpyrifos - May 8, 2019
On May 8, CalEPA and the Department of Pesticide Regulation issued a press release that said California is initiating cancellation of the pesticide chlorpyrifos. The move is designed to protect workers, public health and the environment. 

UC IPM director Jim Farrar issues a statement regarding the California ban on chlorpyrifos - May 14, 2019

UC scientists help clarify use of insecticide chlorpyrifos - Nov. 17, 2014
The UC Statewide Integrated Pest Management Program issues a comprehensive report on the critically important uses of chlorpyrifos in alfalfa, almonds, citrus and cotton.

Critical uses of chlorpyrifos - November 2014
UC Statewide Integrated Pest Management Program convened industry leaders to work together to create commodity-specific guidelines regarding chlorpyrifos use in four important California crops. Executive summary.