Addendum to Wine Grape Exemption

Addendum to Wine Grape Exemption

Risk Assessment: Exemption of Wine Grapes from Regulated Status in the Light Brown Apple Moth Federal Quarantine Order Based on Production Practices


Based on production practices, grapes infested with E. postvittana (light brown apple moth, or LBAM) are unlikely to be shipped out of quarantine areas. Furthermore, because wine grapes are highly processed the likelihood of larval survival and escape from the pathway is very low, whether fruit is processed locally or elsewhere in the country. Based on the risk assessment we found that wine grapes could be exempted from the E. postvittana regulated article list with the understanding that producers continue their current IPM, harvesting, and post-harvest practices.

The reasons for this were that low prevalence in the field made larvae unlikely to be harvested, and that processing was likely to kill any remaining larvae. In addition, any larvae surviving processing would still have to survive to adulthood, find mates and find new hosts. Thus, LBAM is highly unlikely to establish in new areas via this pathway. Green waste, the product left after the processing of wine grapes, is simply the next step in the same pathway. The same logic that exempts wine grapes from the LBAM quarantine applies to green waste as well. This was not specified in the original risk assessment, but was assumed by the writers to be included.


Exempt green waste from the LBAM quarantine in California

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