Author: Peggy Mauk, Travis Bean, Sonia Rios,, Ben Faber and Oleg Daugovish,

There are currently only 10 herbicide active ingredients registered in California for use in bearing avocado groves. Growers rely heavily on glyphosate, which is under political scrutiny, paraquat is a restricted use herbicide and with probable registration loss of simazine due to significant ground water contamination issues California avocado growers need of alternative herbicides. This study has provided critical, science-based information to the California Avocado Commission and herbicide registrants to pursue additional product labels. The objectives of this study were: 1. Determine the safety and efficacy of herbicides currently registered for citrus for use on bearing avocado. 2. Identify both pre and post emergent alternatives to glyphosate and simazine.