There is one generation per year with crawlers active from May 25-June 25. When necessary, treat June l5 and 20. Fletcher Scale Mature scales are shiny, dark brown, and very convex. They are similar in appearance to European fruit lecanium and oak lecanium which are close relatives. Arborvitae and yew are the most frequently attacked hosts, but pachysandra and Eastern Red cedar are also susceptible.
Honeydew excreted by the scales supports unsightly, sooty molds.
There is one generation per year with crawlers active June 5-25. When necessary, treat between June l0-l5. Hemispherical scale does not overwinter outdoors at our latitude and is, therefore, primarily a pest of houseplants and greenhouse plants. Among the most commonly attacked host plants are ferns, palms, avocado, begonia, citrus, chrysanthemum, fig, lily, orchids, and many others. In a constant indoor environment, reproduction is continuous and generations overlap.