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Internal Breakdown and Persistence of Red Clover¹

Field and greenhouse experiments have implicated internal breakdown (IB), a necrosis of the pith of the crown, as a major factor limiting the persistence of red clover. Less persistence in early-flowering types appears to be related to reduced capacity of the plants to survive the effects of IB. Survival of plants with IB appears to be a function of the extent to which an adventitious root system develops. Various treatments failed to affect the incidence of IB. No pathogen was consistently isolated from early stages of IB. Histological studies also failed to reveal any pathogen. A histological description, including the occurence of nuclear anomalies, is presented.

Key Words: survival • histology • dterioration • malignancy • cytological anomalies

² Plant Physiologist, Crops Research Division, ARS, USDA, Prosser, Wash.; present address: Department of Plant Pathology, University of Minnesota, St. Paul.

Received for publication February 8, 1967.

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