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  • Author or Editor: Michael Meiners x
  • HortScience x
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Macrophylla decline was observed primarily in lemons on the macrophylla rootstock (Citrus macrophylla, Wester). This disorder is characterized by foliar zinc deficiency symptoms with zinc accumulation in trunk phloem above the bud union. Trees show symptoms of twig dieback and are less thrifty in appearance compared to the same cultivars on other rootstocks. These characteristics are very similar to a citrus disorder of humid citrus production regions, citrus blight. Citrus blight affects the more vigorous rootstocks (a characteristic of Macrophylla) such as the extremely blight susceptible rough lemon rootstock. In the humid regions, macrophylla is considered somewhat susceptible to blight. Experiments are currently underway to assess the water conductivity of xylem in trees on macrophylla and to screen for the presence of citrus blight specific proteins.

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