Treatment Plan

Please Note: Glyphosate Injury can easily be confused with Eutypa Dieback. Review of both factsheets is encouraged to confirm your diagnosis.

Glyphosate labels typically contain statements prohibiting application when “green shoots, canes, or foliage” are in the spray zone.  In many areas of the country, applications must be made prior to the end of grape bloom to avoid injury, although later applications (within 14 days of harvest) can be made with shielded sprayers or wiper equipment.  Dormant applications are allowed since there is no uptake through mature, exfoliating bark or through dormant buds.  Spray or drift mist contact with immature foliage usually results in chlorosis (yellowing) or necrosis (browning) of contacted tissue, and can be translocated towards the shoot tip, resulting in malformed leaves.  Similar contact with mature foliage is absorbed into the vine and moves with the flow of carbohydrates to photosynthetic sinks such as fruit and roots.  Late season applications can result in carryover damage the following year, or vine death.