Re: Lilacs and horticultaral oil

Bob, I have no clue on proportions for your oil spray - maybe you can
Google the name/manufacturer and find some info. on line. 
Alternatively, you can get some SunSpray or similar hort oil that can
be applied to non-dormant plants.  If your spray has been sitting
around for a long time, it would likely be best for you to get
something new anyway.   I have also used Safer's Insecticidal Soap
with good effect on scale and that can be applied anytime within the
temp. guidelines on the package.

As with all these remedies, check the label to make sure it's OK for
what you intend to spray - some plants are more sensitive to oil and
soap sprays and can exhibit signs of Phytotoxicity if you use them. 
It's important to follow mgf. directions ref. mix, application temps.
and frequency of application.

You might also check Bayer Tree and Shrub Insect Control to see if
it's rated for scale.  It's a systemic that's applied to the ground
around the plant you're trying to treat.  Prime ingredient is
Imidacloprid.  I know it's effective on many sucking insects, but do
not know if it's specifically rated for scale.

Marge Talt, zone 7 Maryland
mtalt@hort.net
Shadyside Garden Designs


----------
> From: Robert Steele <samstee@tds.net>
> 
> I have a infestation of scale on my lilacs and I understand that
now is the 
> time to spray them with horticultural oil. I have Gordon's Dormant
Oil Spray 
> that is 97% petroleum oil but I have lost the directions. How much
should I 
> use per gallon of water?
> 
> Also what other measures should I adopt to control the infesation 
> especiallya fter they bud out and the leaves are on?
> 
> Thanks,
> Bob

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