Q How do I know if my grapevine has brown scale?

A Convex, brown, shell-like scale insects, each up to 5mm long, appear on the rods, particularly on relatively new growth. They suck sap, weakening the grapevine, and produce sticky excreta (honeydew), which may
make the plant sticky and attract the growth of black sooty mould.

Caption: Brown scale colonise grape rods.

Q What should I do if my grapevine has brown scale?

A Grapevines covered with brown scale can be sprayed with a suitable insecticide. Consider treating it with a plant-oil-based winter wash, too.

Q How can I prevent brown scale?

A  Grapevines grown in greenhouses or in protected spots, especially those growing against walls, are particularly prone to this pest. So, without ignoring the needs of the grapevine, consider the planting position carefully.