Dormant spraying involves
applying a preventative spray early in the spring while the tree is still
dormant. Dormant spray is typically comprised of two products which can be
applied together or separately.
One product is dormant oil and the other
product is lime sulfur.
Dormant oils are highly refined oils that act to
suffocate scale, aphids, mites and other insects which seek out shelter from
the winter in the bark of trees. Spraying
now greatly reduces the impact these insects can have later in spring. Lime
sulfur is a fungicide which kills dormant fungus spores on plants.
For example
if you have aspen trees which suffered from black spot or roses with rust and/or
black spot, now would be the time to apply dormant sprays to help control both
of these situations.
Ideal conditions for dormant spraying would be on a day in
late February through March when the temperature will be above 40°F for at
least 24 hours, there’s little or no wind and no rain or snow. Wind will carry
the oil away from the plant you’re trying to protect. You’ll want to spray
early in the morning so the plant will be dry by evening. Spray just enough to
cover the tree or shrub thoroughly. Dormant oil and lime sulfur can be applied
with a hose-end sprayer, tank sprayer or hand held mister bottle. Mix with
water according to label instructions.
For large jobs, get a no-mix hose end applicator.
You set the dial to the right mix number, fill the jar and attach the hose and
spray.
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