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Use of Lorsban

If you’ve been paying attention towards the EPA’s attitude towards Chlorpyrifos (Lorsban) the announcement that it is now banned is not too surprising. Chlorpyrifos is allowed to be used on crops up to February 28, 2022. After that, the tolerances for it expire. Effectively this means that Chlorpyrifos will not be available for the 2022 season.

The recommended treatment for grape root borers in lieu of Chlorpyrifos is pheromone-based mating disruption. The pheromone dispensers should be put out prior to GRB adult emergence (approximately late June in North GA; more information here https://site.extension.uga.edu/viticulture/2020/06/preparation-for-grape-root-borer-2020/). Also, look on the soil for empty pupal skins and use traps to monitor for GRB. If you have questions about the use of Chlorpyrifos or pheromone-based traps, contact your County Extension Agent.

Here is the link to the EPA FAQ on Chlorpyrifos.

https://www.epa.gov/ingredients-used-pesticide-products/frequent-questions-about-chlorpyrifos-2021-final-rule