No apple tree is completely free of disease, but the gap between a well-chosen variety and a poor one is enormous. Plant a scab-magnet like Cox in a damp western valley and you will be spraying from bud burst to August. Plant a resistant sort in the same spot and you may never need to spray at all beyond a little winter tidying.

The varieties below are the ones that consistently ask least of a UK grower: heritage apples that have shrugged off scab for a century, and modern sorts bred specifically for low-spray and organic systems. Resistance is relative, and it depends on your site, so there is a section on matching tree to plot as well.

Know what you are defending against

Scab is the main enemy. It shows as olive-green blotches on the leaves in May, then corky brown scabs and cracks on the fruit by late summer. Powdery mildew coats shoot tips in white felt and weakens young trees. Canker kills bark in sunken, ringed patches, usually around pruning cuts and old fruiting spurs. Fireblight turns up mainly in the warmer, drier east and looks like scorched, blackened shoot tips.

Scab is the disease that responds most to variety choice, which is why so much breeding work has targeted it. One caution before you buy: many resistant apples carry a single gene borrowed from Malus floribunda, often listed as Vf. New scab strains have already got round it in parts of continental Europe where infection pressure is high. Think of resistance as a large reduction in risk, not a guarantee.

Heritage varieties that quietly cope

Russets and thick-skinned old varieties are less easily penetrated, and even infected fruit usually stays edible.

• Egremont Russet – compact, heavy-cropping and nutty; one of the most dependable garden apples anywhere in the UK.
• Ashmead's Kernel – a Gloucestershire russet with a pear-drop flavour that keeps until February. Partly tip-bearing, so prune lightly.
• D'Arcy Spice – an old Essex apple that tolerates dry, light soils and keeps into spring. Best in the south and east.
• Discovery – early, bright red and useful in August, though it can be canker-prone on wet ground.
• Lord Lambourne – a reliable mid-season eater with good scab tolerance and a long picking window.
• Sunset – the closest thing to a Cox you can grow with little spraying, though it dislikes heavy clay.

Modern varieties bred for low-spray growing

These apples were selected for exactly the situation most gardeners face: no spray programme, variable weather and a small tree. Flavour has improved a great deal since the first generation.

• Topaz – crisp, sharp and juicy, with strong scab resistance. Crops heavily in late September and makes excellent juice. It dislikes heavy, wet soil.
• Rubinola – a red, sweet-sharp Czech apple with good scab and mildew resistance and a long keeping season.
• Florina – vigorous and reliable, resistant to scab and fairly tolerant of canker. Flavour is decent rather than exciting.
• Liberty – resistant to scab, mildew and fireblight. A useful late apple for storing and cooking, though plain eaten fresh.
• Enterprise – very broadly resistant, crops late and stores well into the new year.
• Santana – Dutch, scab-resistant, with a firm, refreshing bite; a good small-garden choice because it crops young.

British-bred apples worth a place

Breeding at East Malling and elsewhere has produced several varieties that suit our climate well. Meridian resists scab and mildew, crops generously and tastes like a good Cox, though the fruit does not keep long. Saturn is equally tough and extremely productive, with small red fruit better for juice and cooking than for eating. Falstaff gives Cox-like flavour on a tree that rarely suffers badly from scab, but crops so heavily that you must thin it. Suntan has some of the best flavour of any Cox relative and shrugs off scab, though it is a triploid: it needs a partner to pollinate it and will not pollinate anything else.

Cookers and dual-purpose trees

Bountiful is one of the best garden cookers: scab-resistant, heavy-cropping and happy on most soils. Lane's Prince Albert is a Victorian favourite that copes with heavy clay and wet ground better than most. Golden Noble and Edward VII both crop well with little trouble. Bramley is reasonably resistant to scab but cankers badly on wet sites, so plant it only where air moves freely.

Matching the tree to your plot

• Wet west, high rainfall: Topaz, Bountiful, Lane's Prince Albert, Rubinola. Avoid Cox and James Grieve on heavy ground.
• Dry, sheltered east: D'Arcy Spice, Ashmead's Kernel, Egremont Russet, Liberty.
• Small garden or trained tree: Egremont Russet, Santana, Meridian and Falstaff all work well as cordons or espaliers on M9 or M26.
• Little time to prune: spur-bearing sorts such as Bountiful and Saturn, rather than tip-bearers like Ashmead's Kernel.

Pollination still matters. Most varieties flower in groups 2 to 4; pair something from an adjacent group and check that neither is a triploid. In a built-up area there are usually enough neighbouring trees within a few hundred metres to do the job.

Getting the best from a resistant tree

Resistance buys you margin, not immunity. A few habits keep the advantage on your side:

1. Plant in full sun with at least two metres of clear air around the canopy. Good airflow dries the leaves and stops scab spores settling.
2. Rake up and bin fallen leaves in autumn, especially under scab-prone trees, rather than composting them beside the trunk.
3. Prune in dry winter weather, cutting back to a clean collar and leaving no stubs, which are the commonest entry point for canker.
4. Feed lightly. Rich, soft growth suits mildew and aphids far better than it suits fruiting.
5. Thin heavy crops in July to one fruit per cluster; the remaining apples size up better and store longer.

If you do decide to spray, a sulphur or potassium bicarbonate programme from bud burst to early summer is the usual low-toxicity approach for scab and mildew, and it works far better on a resistant variety than a susceptible one. Follow the product label exactly, and never spray while bees are working the blossom.

Start with one or two of the varieties above, plant them well, and judge them after three or four seasons on your own ground. That is the only trial that really counts.

Photo: Ralphs_Fotos / Pixabay