The Q&A Archives: Red galls on grape leaves

Question: Last year I had tiny, pea shaped, brownish red galls on the undersides of my Remaily grape leaves. What were they? Bill Gross Nashville, TN

Answer: Your problem is grape phylloxera, a small, aphidlike insect that feeds on the roots and leaves of grape varieties. This pest almost destroyed the grape crop in France in the 1800s, says Mary Howell Martens, assistant grape breeding specialist at the New York State Agricultural Experiment Station in Geneva. Phylloxera adults feed mostly on grape roots, but in midsummer the insects emerge from the soil and lay eggs on leaves. The eggs hatch and larvae feed on the leaves, forming galls. The larvae emergehe adds. In that case a single spray of carbaryl (Sevin) at grape bloom time should do the trick.

« Click to go to the homepage

» Ask a question of your own

Q&A Library Searching Tips

  • When singular and plural spellings differ, as in peony and peonies, try both.
  • Search terms are not case sensitive.

Today's site banner is by mcash70 and is called "Moss on a log"