Investigations of Internal Bark Necrosis in ‘Delicious’ Apple Trees1

in Journal of the American Society for Horticultural Science
Authors:
Timothy E. CrockerDepartment of Horticulture Michigan State University, East Lansing

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A. L. KenworthyDepartment of Horticulture Michigan State University, East Lansing

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Abstract

In 4 experiments conducted to study internal bark necrosis (IBN) in apple, ‘Delicious’ trees were treated with Mn, Fe, Cu, and Al (100 and 200 ppm in nutrient solution), Mn, Fe, Cu, plus Al (50 ppm each) and a minus B treatment. Only trees receiving Mn and minus B developed IBN symptoms. Trees grown under normal and low levels of Ca and receiving variable concentrations of Mn (0, 25, 50, 75, and 100 ppm) developed IBN in proportion to Mn concentration. Spur-type and standard ‘Delicious’ trees did not differ in IBN severity. Bark samples with IBN symptoms, when analyzed on the electron microprobe x-ray analyzer, had greater Mn and Ca concentrations in necrotic tissue areas than in non-necrotic areas. IBN lesions induced with minus B had a higher Ca concentration in necrotic areas than in healthy tissue

Contributor Notes

Received for publication May 25, 1973. Published as Journal Article No. 6387 of the Michigan Agricultural Experiment Station.

Present address: Department of Fruit Crops, University of Florida, Gainesville.

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