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Soil Sickness
Apples, peaches, grapes, cherries and plums are prone to suffer from soil sickness if replanted in the same soil successively. They however, recover from sickness if replanted in new soils. The symptoms differ from plant to plant and the disease syndrome has been frequently reported from Ger­many, Canada and U.S.A. Such plant disorders may be attributed to nutri­tional deficiency, pathogenic microorganisms whose identity is yet to be established and phytotoxins secreted by roots of plants or by microbial decomposition of plant residues. A cumulative effect of one or more factors may also be responsible for the disease syndrome, in fruit orchards.