Atlanta Pruning and Landscape Service Company
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Designed by The Pruning Guru, Inc. © 2011 
As Defined By: The University of Georgia

The fungusCalonectria pseudonaviculata (syn. Cylindrocladium pseudonaviculatum),
cause of boxwood blight.

This is a serious disease of Dwarf English and American boxwood to a lesser extent Japanese and Korean types.  There is no control once plants are infected!  Infected plants need to be removed from the area by placing in a sealed plastic garbage bag for disposal by burying in a landfill or burning on site.  The pathogen can spread easily by water-splashing and movement on tools (pruners, hedge shears, shovels), clothing (boots, pants, etc.), and hair/feathers (pets and wildlife).  All fallen leaf litter needs to be burned on site with a propane torch or vacuumed as the pathogen can survive within the leaf litter and infect other boxwoods on site or wherever the litter is blown (across yards, nursery beds or off uncovered trucks). 

Fungicide applications can only prevent infection of non-infected plants. 

The most efficacious products are:

Chlorothalonil (Daconil, Spectro 90, etc.)
Fludioxonil (Medallion, Palladium)
Metconazole (Tourney)
Tebuconazole (Torque) 

Do you know what to look for?