Oyster shell scale and Lepidosaphesulmi of Lilac

Disease Information

Oyster 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 (15°C).
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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