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The sap-feeding scale insect Unaspis euonymi is particularly attracted to Euonymus japonica, although it will feast on other evergreen euonymus too. The white males congregate on the leaves, but the brownish-black females live on the bark, making them hard to spot. Large numbers ...

Nesting female bees cut out immediately obvious elliptical shapes from the edges of a leaf to make their cells for laying eggs. Since one female might need 20 or so cells, that's a lot of leaf cutting, particularly when the bee keeps returning to the same plant. It's only a signi...

The rose leaf rolling sawfly injects a chemical into young rose leaves to cause them to curl protectively around her eggs. Within a week the eggs hatch into green caterpillars that start to eat their home. In mid-summer, leaving behind skeletonised foliage, they crawl down into t...

These miniscule sap-sucking insects multiply rapidly on leaves. Large colonies are immediately evident, as are the symptoms - silvery-white discoloration of the leaves and distorted shoot tips and buds.Packed clusters of tiny white insects on leaves produce several symptoms. The ...

Sometimes shoots appear on previously plain-leaved plants with attractive variegations, and these can then be propagated by nurserymen to make a new plant. But the new variegated plant might try to revert to all-green foliage because the mutation isn't stable. If left, this all-g...

Balling is triggered by cool, damp conditions, often in a partially shady site, where water-saturated outer petals fail to dry out before being scorched by the sun. The mushy plant tissue dries to form a stiff straightjacket around the petals, preventing the flower from opening. ...

Winter pruning wisteria encourages the development of short-flowering spurs that carry the flowers in spring. The long vigorous shoots produced on the wisteria need to be cut back at least twice during the year, so you'll need to repeat this pruning in late-June or early July.Wis...

This fungal problem results in rounded spots on the leaves. Although it's unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves.A fungal attack causes an outbreak of spots on the leaves...