Abstract
Root growth of red clover and injury by the clover root curculio ( Sitona hispidula (F.)), the weevil Calomycterus setarius Roelofs and the clover root borer ( Hylastinus obscurus (Marsh.)) and their association with root rot, internal breakdown of crown tissue, and virus were investigated by weekly examinations of plants during two growing seasons. The data indicate that weevil damage, internal breakdown, and associated and independent root rot are the major factors in the lack of persistence of red clover. The interaction of these factors probably contributed to the arrested plant growth during June of the second year and at the end of October had killed two-thirds of the plants in the experimental plot.
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