White Prunicola Scale (Pseudaulacaspis prunicola), Family Diaspididae
Plants Damaged: This scale is commonly found on Prunus species but can also be seen on magnolia, ligustrum, rhododendron, forsythia, boxwood, and lilac.
Damage Symptoms: Dieback of twigs and yellowing of foliage
Life Cycle: Crawlers are present in May. A second generation occurs in July and a third in September. Crawlers appear about 2 weeks earlier than white peach scale. Crawlers are out in early May to June. Second generation crawlers are out from mid-July to mid-August. The third generation crawlers are out in September.
Monitoring: Both male and female crawlers are salmon colored.
Control: When crawlers are out, Distance mixed with 1% horticultural oil gives excellent control.
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