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Also know as American gooseberry mildew, this greyish-white powdery growth of the fungal disease Sphaerotheca mors-uvae appears on new shoots, which can become distorted and die off. The mildew also affects the upper leaf surfaces and stems

The white powdery coating on a curcubit's leaves is made up of spreading fungal spores. This affects the plant's performance, with growth, flowering and fruiting all being adversely affected. In extreme cases, the mildew can lead to dieback and even

, while general growth and vigour is poor. Also learn about powdery mildew on roses.In summer, a white powdery coating covers the leaves and possibly the shoot tips and flowers too. Leaves may then become discoloured and distorted, with poor growth

During an enjoyable day scouring for new plants at a horticultural trade show last week, several growers told me about a devastating new fungal disease killing off busy Lizzies in parks and gardens up and down the country.Impatiens downy mildew

Rose powdery mildew is a fungus that produces airborne spores from infected stems or buds on roses. After overwintering on your plants, the disease is most likely to flare up if the roots are in dry soil and the leaves are in humid air - conditions

A fungal plant disease that causes a powdery coating on the surfaces of affected plants. Commonly occurs where plants have been exposed to damp conditions. It can be prevented by having good ventilation.

as ‘The Impatiens and Downy Mildew Man’ (well, that’s my name for him). Sadly, they’re still unable to come up with a miraculous solution to the downy mildew problems associated with busy Lizzies (Impatiens). But, believe me, they’re hard at work on it

Are your roses martyrs to disease? Are their leaves covered with black spots or a white overcoat of powdery mildew? Well, I'll come clean and put my hand up on both counts. Much depends on the time of year and whether it's wet or dry - but, most

to prevent infection by mildew, rust or blackspotPrune early-flowering clematis, such as Clematis montana, immediately after flowering to control their size

Hang pheromone traps in fruit trees to control moth pests, such as codling moth larvae, which eat applesThin out congested fruit crops on peaches and nectarines, spacing fruits about 10cm apartWatch out for signs of powdery mildew or disease