Abstract
CHASE, A. R., and D. E. MUNNECKE. 1980. Control of Acremonium wilt of Shasta daisy. Plant Disease 64:377-379. Shasta daisies (Chrysanthemum maximum) were propagated in vitro using shoot tips (0.5 mm long) from field-grown 'Killian' daisies infected with Acremonium strictum. Viable explants were assayed, and those free from internal fungal and bacterial contaminants were multiplied in vitro. Commercial fumigation of naturally infested fields (sandy loam soil) at the rate of 340 kg per hectare of a 2:1 mixture of methyl bromide and chloropicrin delayed reinfection of pathogen-free plants for as long as 6 mo. Acremonium wilt of Shasta daisy (Chrysanthemum maximum Ram.) was first reported in 1978 (2). Symptoms include vascular browning, chlorosis and necrosis of the lower leaves, wilting, stunting, and overall debilitation of the host. The causal agent, Acremonium strictum W. Gams (3), is a weak pathogen dependent on stress of the host for maximum development in the plant. Elimination of the fungus from the plant Present address of senior author: Agricultural Research Center-Apopka, Route No. 3, Box 580, Apopka, FL 32703.
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