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Cottony Maple Scale Update
This article was published originally on 6/17/1994The cottony maple scale outbreak described in last weeks newsletter seems to be very limited in distribution. So far, the noticeable presence of the scales fluffy white egg cases on the twigs of silver maple trees has been reported in the relatively small triangular area of NW Iowa between Kossuth, Greene and Sac counties, and in Black Hawk County. Other isolated infestations are certainly possible.
The following points recap the highlights of this pest.
Insecticidal soap is available from garden center, hardware and department stores under various trade names. Look for a product that lists as the active ingredient "potassium or sodium salts of fatty acids." Mix and apply commercial products according to label directions.
You may substitute ordinary dishwashing detergents for the commercial products with little risk of injury to maple trees. To make your own insecticidal soap spray solution, mix 5 tablespoons of liquid dishwashing detergent in 1 gallon of water.
Soap sprays have no residual activity and only control insects that are contacted directly. Thorough spraying of leaf undersides is important for control.
Year of Publication:
IC-467(15) -- June 17, 1994