White County
 Gardening
Podcast
January 21, 2009
Dormant Spraying of Fruit Trees and Deciduous Shrubs (2:24 minutes)
Audio/Video Script:
Sherri Sanders
County Extension Agent - Agriculture
Hello this is Sherri Sanders, County Extension Agent – Agriculture in White
county. Dormant spraying helps to keep destructive insect populations as well as
potentially deadly fungal infections under control. Dormant spray should be
applied to all deciduous trees and shrubs which had insect infestations or
disease during the prior year. This is especially important for fruit trees and
roses.
Dormant oil spraying should be done on a clear day when there is little or no
breeze. The ideal temperature for application is between 40 and 70 degrees F.,
preferably temperatures should remain over 50 degrees F. for at least twenty
four hours in order to get the oil to spread out over the tree and cover all
crooks and crevices. Complete coverage is required for effective control of all
over wintering pests. Apply this spray under pressure with a pump sprayer, or
with a hose‑ end sprayer two times; when all of the leaves have fallen (late
November or early December), and again in early February before buds begin to
swell. In some instances, gardeners are successful with only one application
during the period of early December through late January. But if the infestation
or disease was very bad during the previous season, two sprayings would be the
best bet.
These oils will smother insect eggs over wintering in the same places as the
fungal spores. These products can be mixed together with lime sulphur for
excellent control of insects and disease. Because these products are oil based,
be sure to shake, not stir, them to ensure complete blending.
Caution! It is essential that you always follow the manufacturer's
recommendations when using any chemical product. Limit your spraying to the
plants which have had infestations during the prior year. Widespread spraying
can have the adverse effect of killing many beneficial insects. Always wear a
mask when spraying your plants with chemicals. These products should never be
used on evergreens because they are much too strong and caustic, and can cause
damage. The use of a dormant oil mixture may destroy many annual flowers growing
under or near plants being treated. Completely cover such tender vegetation
BEFORE spraying. Fungus spores can also over winter on fallen leaves. Be sure to
rake and dispose of leaves if you know you have a disease problem.
For additional information contact your local Cooperative Extension Service.
This has been Sherri Sanders in Searcy.
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