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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

pull them out if they appear in the garden. Every two weeks from early spring onwards spray plants with a systemic action fungicide.hollyhocks, mallowall year roundCommon fungal problems affecting plantsIris leaf spotRose blackspotRose rustTulip fire

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

.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

. Infected foliage must be disposed of immediately, as the fungus can survive on the plant if left lying on the ground. The early, large-flowering varieties are most prone to attack, with smaller-flowering species (eg, C. montana) being the most resistant

. 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

There are many different fungi that cause this problem, each of which usually affects a particular plant or group of plants. In each case they produce similar symptoms. Affected plants will have discoloured leaves, often also distorted when young

knife and dust the wound with fungicide.liliesspring, autumnMore advice on growing liliesDividing day lilies videoRemoving lily beetlesPlanting lily bulbs in a potDeadheading lilies

of plants. They debilitate the plants and secrete a sticky, sugary honeydew that covers the leaves, which often results in further problems, such as sooty moulds. Infestations of white, waxy insects on indoor and greenhouse plants, along with sticky honeydew