The Q&A Archives: scale

Question: My boxwood shrubs are showing signs of scale. They are about 5 years old and this spring it has been very humid with little sun. I need to know what to treat them with.

Answer: If the scale population is small, scraping them off with your fingernail is the best solution. If scales become too numerous, a well-timed and thorough spray using horticultural (narrow-range) oil applied either during the dormant season or soon after scale crawlers are active in late winter to early summer should provide good control. Complete spray coverage of infested plants (such as the underside of leaves) is needed to obtain good control. Be sure to read the product label and follow the directions - oils can suffocate plant leaves if applied at the wrong time of the year. Best wishes with your landscape!

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