Determining the Cause and Extent of Apple, Cherry, and Pear Replant Diseases Under Controlled Conditions

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Abstract
A replant disease of fruit trees was reproduced under growth chamber conditions. Apple, pear and cherry seedlings, grown in nontreated apple, pear, or cherry orchard soils with histories of replant disease, were stunted and their roots were discolored and reduced in size. Although pretreatment of the soil with dichloropropene-dichloropropane and related C3 hydrocarbons (DD) resulted in an improvement in plant growth and development over the nontreated check, it was inferior to the chloropicrin and steam treatments. Growth response of apple, pear and cherry seedlings to soil treatments was greatest in the apple replant soil. This soil contained high populations of Pratylenchus penetrans and Paratylenchus projectus. The apple, pear and cherry orchard soils were, respectively, sandy loam, loam and loamy sand with pH values of 7.2,5.5 and 5.7. The replant disease of fruit trees in New York [USA] is nonspecific; biological agents in addition to plant parasitic nematodes (principally P. penetrans) are involved.

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