Generally, plants that are severely infected and showing symptoms throughout
the crown cannot be saved. Plants with less severe symptoms, however, may
To help trees combat this disease, keep them adequately watered throughout
the summer. They need about an inch of water per week in either rainfall
or irrigation. If there is a dry period, place a hose beneath the tree
and let the water trickle gently for several hours so that the water will
soak deep into the ground. Do not allow the water to runoff the surface.
Proper fertilization may help trees fight verticillium wilt in the landscape.
A balanced fertilizer such as a 12-12-12 or 10-10-10 (N:P:K) should be
It is important to apply a fertilizer with
(K) to plants suffering
early stages of Verticillium wilt. Do not apply lawn
fertilizers such as
45-0-0 (Urea) or 27-3-3 since these high
nitrogen products may actually
worsen the wilt problem.
showing early symptoms should be fertilized yearly
in the early spring once the frost is gone from the ground. Do not fertilize
these plants in the summer or fall.
Using an auger drill bit or post hole digger, make holes about 12 inches
deep and in circular patterns around the tree. Start at least about 3 feet
from the trunk to avoid damaging major roots and extend out to the drip
line of the tree. Apply fertilizer at the rate of 6 lbs. of nitrogen per
1,000 square feet of area and refill the holes with peat moss.
Prune out and destroy dead and dying branches but not those that
have recently shown signs of wilting. They may come back the following
Remove dead trees along with as much of their root system as is possible.
Do not bury the debris or use the wood chips from infected plants.