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Brown Scale



P_brownscale

Brown Scale

Usually appear in

Spring and Summer


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Caused By:-     The Scale Insect Parthenolecanium corni

Description

Brown scale insects up to 5mm long attach themselves to the stems and leaves of several plants and shrubs, especially in sheltered growing areas. The sap feeding insects excrete honeydew which makes the leaves sticky and allow other moulds and fungus to grow.
See these other Scale insects Azalea Bark, Azalea Cottony, Beech Bark, Eucalyptus Gumtree, Euonymus Mussel, Hemispherical, Horse Chestnut, Hydrangea, Juniper, Mussel, Oleander, San Jose, Scale, Soft, Viburnum Cushion, Wisteria, Wooly Vine.


Control

The shell or scale protects the older insects from insecticides, so spraying is more effective against the newly hatched nymphs, called crawlers, which have legs and can move about.
With scales on outdoor plants the eggs hatch in late June to July, when spraying should be commence.
Scales insects in greenhouses or on houseplants breed throughout the year so all stages in the life cycle may be present at the same time.
Scale insects can remain attached to the plant long after they are dead but new growth should be free of scales once they have been brought under control.
On indoor plants systemic insecticide is best as the outer scale usually protects the insects inside.
Brushing of the insects with methylated spirits can be tried or if the infestation is light picking off the individual insects along with keeping an eye out for young hatchings.

P_brownscale P_brownscale2

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