Bumps on Old Grape Vine Leaves: Phylloxera Galls

Bumps on grape leaves, whole vine affected, slight yellowing = likely grape phylloxera (aphid-like insect forming galls). Cut a gall open: hollow with eggs inside confirms it.

Sanitation

• Rake and destroy all fallen galled leaves in fall/winter.
• This reduces overwintering population for next year.
• If unsure, send close-up photo for confirmation.

Phylloxera on grape is different from root phylloxera (which kills vines); leaf form is manageable.