Other species include Armillaria obscura, Armillaria ostoyae , Armillaria bulbosa and Armillaria tabescens . Honey Fungus in a garden originates from a dead stump or the buried lateral roots from a tree that has died from Honey Fungus or been felled some years before. Unfortunately when a tree is removed from a garden, more often than not, it is sawn off across the base rather than pulled over - the roots left being the food supply for the pathogen. Remove dead wood or trees from completely or avoid placing a new garden in a previously wooded area. Gray Mold Gray Mold , Botrytis cinerea , is a fungus that over-winters on decayed rhubarb plant parts.
Spores also are abundant on decayed parts of other plant species and in the air.
The disease can be a problem in the field but is more destructive in forced crops. On older leaves and stems, a powdery gray mold develops under moist conditions. During harvest, packing, and shipping, stems are further infected. Remove all broken root and crown pieces from forcing house. Circulate air through the forcing house to keep leaves dry.