Treatment for Root Rot in a Weeping Willow

Soil

• Management of root rot starts with giving the tree a good start in a well prepared site. Avoid planting in very compact or poorly drained soils. A number of root rot pathogens infect plant roots in waterlogged soil. Root rot organisms are not active during spring and summer, as cited by the Ohio State University Extension.

Site and Plant Selection

• It is best not to plant in areas with known prior cases of root rot as the fungus lingers for extended periods in the soil. Try to use resistant tree varieties, if available, as this reduces chances of infection.

Vertical Mulch

• Applying vertical mulch, also referred to as core aeration, helps to control root rot by improving drainage around roots and leading to formation of fine feeder roots. Create 18-inch deep, 2-inch wide holes in the soil surrounding the trees close to branch drip lines. Use equal part of coarse aggregate and peat to fill holes.

Chemicals

• The use of chemicals, such as soil drenches, is not recommended for landscape trees, as cited by the Ohio State University Extension. This is because it is hard to apply the products to plant roots hence reducing efficacy in treating already infected plants. Cultural practices are often sufficient to treat root rots.