Control of Acremonium Wilt of Shasta Daisy. A. R. Chase, Research Assistant, Department of Plant Pathology, University of California, Riverside 92521. Donald E. Munnecke, Professor, Department of Plant Pathology, University of California, Riverside 92521. Plant Dis. 64:377-379. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-377.

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.