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's not confirmed how the virus is spread, but sap-sucking insects, nematodes and gardening tools, such as pruning knives, are likely contenders.Canna leaves develop pale spots and streaks, as well as a distorted, crinkly look, while flowers may also become

flower buds might never open, or do so unevenly.When disturbed, the bugs quickly drop to the ground or fly away, so you'll have to be quick if you want to catch and squish them. Remove their hiding places by keeping the area under plants free of debris

growth. Check the pots daily.clematis, dahlias, chrysanthemums and other plantsspring, summer, autumnMore common garden pestsWaspsSlugsAntsCaterpillars

.a range of ornamental plants, trees, shrubs, herbs, some vegetables, fruitspring, summerMore common garden pestsAphidsScale insectsFlea beetleEarwigs

.Promptly pick off and destroy affected leaves. If leaf spot is a persistent problem, try growing your primulas under glass.Spraying with myclobutanil may help give some control, although they're not specifically labelled as a solution for primula leaf spot

. In severe cases, growth becomes distorted, leaves curl up, the plant weakens and can die.Natural predators, such as birds, earwigs, ladybirds, lacewings, hoverflies, ground beetles, spiders and parasitic wasps are a gardener's best allies. Some

The large, beautiful caterpillar larvae of the elephant hawk moth has two pairs of eye markings, which are made even more prominent when it withdraws its head into its body. They are, typically, a blackish-brown colour but are sometimes green, and though their 'eyes' make them lo...

The distortion, known as fasciation, is a freak of nature, and often looks like several stems have been fused together. It's a rare phenomenon and does the plant no lasting harm. It can develop on a range of shrubs, flowers and perennials. The cause