Sunday, May 29, 2011

Mysterious spots on tunnel raspberries

An Extension agent found these spots on tunnel raspberries last week. The fruit has been sent to the clinic for identification. We have a couple of theories on what it may be, and will let you know what it is as soon as we receive confirmation.


  1. Hi,
    the results just came in from our clinic in Clemson. Cladosporium and Botrytis were found on stamen tissue on the fruit surface. This complex of plant tissue and fungus likely caused the discoloration. The Botrytis (causes gray mold) concerns me for obvious reasons.

  2. Hi,
    We have found this same issue in tunnel raspberries in Tasmania. Have only seem to be affecting fruit late in the season, has not spread out of the block since it was first sighted about 5-6 weeks ago. damaging about 35% of the ripened fruit. Any information would be greatly appreciated.

    Kind Regards

  3. There was a similar problem, a grower had flower petals adhering to the ripe fruit and turning black. They think it was related to high RH and lack of air movement in the tunnel, so petals did not drop.