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Apple proliferation phytoplasma

Witches broom symptoms on apple trees infected with Candidatus Phytoplasma mali

Apple proliferation phytoplasma (Candidatus Phytoplasma mali ['Ca. P. mali']) is a virus-like plant pest of apple trees that affects fruit quality and the overall viability of a tree. This pest is considered to be a quarantine pest by Canada and the United States.

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