A root disease of common alder caused by Phytophthora sp. is widespread in southern Britain. It is estimated that more than 20 000 trees are seriously affected. Une infection racinaire due à Phytophthora sp. est largement disséminée dans le sud de la Grande‐Bretagne. Plus de 20 000 arbres sont estimés gravement atteints.
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J. N. Gibbs (1995) studied this question.
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