Brown scale Parthenolecanium corni

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The female scale, measuring up to 6 mm, is tortoise shaped (see Figure 14.11) and has a very thick cuticle. It may be a serious pest

Figure 14.12 (a) Bud blaston rhododendron transmitted by a leafhopper (b) Capsid damage on apple.(c) Capsid damage on potato leaf

Figure 14.12 (a) Bud blaston rhododendron transmitted by a leafhopper (b) Capsid damage on apple.(c) Capsid damage on potato leaf outdoors on vines, currants, top fruit and cotoneasters, sucking phloem sugars out of the plants. It is also found in greenhouses on vines, peaches and Amaryllis, causing stunted growth and leaf defoliation. The nymphs are mobile, but do not spread far. Transport of infested plant material is the main cause of outbreaks in greenhouses. As with mealy-bug, control is made more difficult because of the thick cuticle, but products containing fatty acids give good control. A recently reported scale problem is soft brown scale (Coccus hesperidum) in greenhouses.

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