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Blackberry Diagnostic Tool

Fruits Are Small, Deformed, or Crumbly

Tarnish plant bug can feed on and deform berries.

Mature fruit with deformed/mini drupes.

Virus infection can result in deformed berries or complete abortion of druplet development.

Druplets are splitting (occurs after rain when fruit is ripe)

Fruit are either soft and lighter colored or are hard and dried up due to frost or freeze

Fruit have "leaves" emerging from druplets (unknown cause—possibly hormonal deficiency)

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