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OTHER THINGS



Pearl glands can be confused with guttation or mite eggs
Pearl glands can be confused with guttation or mite eggs
Photo credit: Peter Bailey
Look For Look For Notes

   LOOK FOR

    Look for in shoots
  • FASCIATION - affected shoots may be flattened, enlarged or otherwise distorted.

    Look for in leaves
  • VARIEGATION - the most common form. Parts of leaves turn white or yellow.

    Look for in bunches
  • HEN AND CHICKEN - bunches with small berries scattered among normal sized-berries. This is common in some clones. Poor fruit set following cold or wet weather may cause similar symptoms.

   CONDITIONS

  • MUTATIONS
  • Caused by genetic changes within the grapevine bud
  • Also called bud sports or chimeras. At least three types of change may occur but often only a single shoot is affected.
  • OTHER THINGS
  • Occasionally some strange symptoms may appear
  • PEARL GLANDS - Tiny balls of vine cells on stems, tendrils, petioles or leaf veins on vigorous vines in warm, humid conditions. Not harmful.
  • GUTATION (SAP BALLS) - Minute white drops of sap exude from the saw-tooth edges of leaves of vigorous vines after some dewy mornings. Not harmful.

OTHER OTHER THINGS IMAGES

Variegation, showing leaves with yellow and white sectors Fasciation, showing distorted leaves on single shoots 'Hen and chicken' grape bunch from a mutation in the bud Slime mould may grow on leaves or shoots kept wet for long periods neat the ground. It causes no damage Poor fruit set (right) compared to normal (left) can be caused by wet weather at flowering, poor vine nutrition or by other factors Shaded leaves inside dense canopies may turn yellow

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