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Gloomy Scale

Gloomy Scale

June 4, 2013 Bugs and Crud

Gloomy scale is an armored scale creep that may cause considerable damage to 
red maples. These insects may also be found on; snowbell (Styrax), grape, Chinaberry, hollies, 
mulberry, sweetgum, and buckthorn. The shells, or tests, of gloomy scale appear as small black 
bumps and can be found on the trunk and limbs of trees. These insects feed directly from the 
tree. Over time severe infestations can lead to branch death, and may contribute to over-all tree 
decline. 
 
Control for gloomy scale should target the immature crawler phase (1st generation hatching now!), as the mature scale’s test 
provides protection from contact sprayed insecticides. Soil and trunk applied systemic 
insecticides have not shown to adequately control this insect.

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