shell scale and
This type of scale is known as the
apple mussel scale
you can control their infestation on
lilac plants by pruning the branches that have been infested heavily. In the
next spring, you should apply a dormant-oil spray before the emergence of new
leaves. You need to undertake this treatment prior to the bud break and
essentially on an arid, sunlit, mild morning. In order to avoid harming the
lilac plant, ensure that you do not apply the dormant-oil spray when the
temperature is below 39°F (4°C) or 48 hours before or after a frost.
Preferably, you should undertake the treatment on a calm morning when there no
frost is anticipated that night and the atmospheric temperature is over 60°F
You can also eliminate scale by painting the
lilac branches with a solution of lime-sulfur using a paint brush. Alternatively, you can directly spray a soap water solution on the plants to kill scale.
Add one teaspoon (5 ml) of any liquid dish soap that is additive free (such as
Ivory) to one quart (1 liter) water and spray the solution on the plants. In
fact, the soap water solution is most effectual when sprayed in the later part
of spring or the beginning of summer - the time when these pests are in the
crawler stage. Continue spraying the soap solution till the foliage seeps.
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