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One of the most common disease ascribed to boxwood is decline. Decline refers to the general debilitation of a woody plant. It is manifested by slower than normal growth, small leaves, loss of green color, and dead twigs and branches. Decline usually occurs when the root system of a plant is impaired by parasitic organisms or unfavorable soil environment. Nutrient deficiencies or toxicities also can cause decline.
In some plant species, viruses and/or mycoplasma-like organisms cause decline.
Fungi Attack Both
Root and Crown
Decline of boxwood usually refers to a disease of English boxwood incited by root and crown colonizing fungi. Because the symptoms are similar, decline is often confused with symptoms incited by parasites or environmental factors acting directly on twigs and foliage. A single plant may have both twig blight and root rotting fungus. The only way to determine if the roots are healthy is to wash them free of soil and inspect them for descoloration and decay, or submit roots and soil samples to a diagnostic lab.
English boxwoods exhibiting decline symptons have roots and/or crowns that are colonized by one of several fungi. Root lesion and spiral nematodes also can debilitate roots and cause decline. The fungi and nematodes are not mutually exclusive; that is, they all may occur at the same time in various proportions.
Symptons of decline appear on individual stems or whole plants as a yellow to bronze coloration of foliage. Death of sections of the plant is common. Very often, the basal area of the stem is discolored. The bark must be removed to see this symptom.
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Only Good Practices Can
Sometimes Prevent Problems
Currently, no fungicides or nematicides are recommended for con
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