Last week John Roncoroni, a Napa County UC Cooperative Extension weed science advisor, held a field demonstration about the efficacy of herbicides newly registered for vineyard application. He had laid out 25 treatment plots and rated the herbicides for weed control in vineyards.

The trials demonstrated that some new herbicides are very effective, especially if a mix of more than one is applied. But they also showed how ineffective some herbicides were against troublesome, newly arrived weeds.

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