Pests & Dideases

Vegetables

Sow direct in ground.

Calabrese, early carrot, summer cauliflower, Chinese cabbage, lettuce, spring onion, radish, turnip.

Sow in Pots

Spring cabbage, calabrese.

Brassicas can be sown in a seed bed.

Plant outdoors

Calabrese, Chinese cabbage.

Harvesting

Lift onions, shallots and garlic when ready. 
Regularly pick fast-maturing vegetables such as French beans, runner beans, courgettes, cucumbers and tomatoes, to prevent stringiness or toughness, and to encourage further cropping. Excess pickings can be frozen.
Finish harvesting second early potatoes, especially if it turns wet, as slugs will become active.
Harvest sweetcorn as it ripens.
Marrows should be raised off the ground slightly, to prevent them rotting from contact with the soil. Some older leaves can be removed.

Fruit

Continue to pick summer fruit.
Lift and pot up rooted strawberry runners. Prepare new strawberry beds for next year if not yet done.
Cut out fruited canes of summer raspberries and tie in new canes to fruit next year.

Tie in new growth on blackberries and hybrid berries.
Start picking apples and blackberries.
Support heavily laden branches on plums to prevent breakage.
Complete summer pruning of restricted fruit trees such as cordon and espalier apples and pears.
Prune out dead and fruited wood after cropping of fan-trained plums and cherries, and tie in replacement shoots.

Remove apples, pears and plums affected with brown rot to prevent the disease from spreading.
Gather scabby leaves from diseased apples and pears. Do not compost.
Spray apples with hydrated calcium nitrate if apple bitter pit has been a problem.
If bacterial canker has a been a problem on stone fruit trees, then prune out affected smaller branches, wait until harvest is complete, and spray with fungicide. 
Treat strawberries with fungicide if powdery mildew is serious.

Herbs

Take cuttings of rosemary, bay and hyssop. 
Cut back flowered herbs such as marjoram to encourage a second flush.

Other herbs can be potted up and taken into the house for convenient use over the autumn and winter.

Around the Garden

Weeds can also compete with vegetables for water, and act as hosts for pests and diseases, so should be removed regularly by hoeing.

Continue earthing up celery, putting a layer of paper between the stems and the soil.
Take care when thinning out any late-sown carrot seedlings to prevent the scent released attracting carrot fly females. To protect them from carrot fly use fleece or mesh coverings.
Sow green manures such as crimson clover and Italian ryegrass to act as a soil improver and to cover bare areas. 

Keep up with potato blight control on outdoor tomatoes and potatoes to prevent further infection of the crop. Cut off the haulms (tops) of blighted potatoes and burn them. The tubers can still be harvested. Potato powdery scab is also prevalent at this time of year.
Watch tomatoes for blossom end rot, ghost spot, blotchy ripening and greenback.
Look out for the caterpillars and excrement of the pea moth, and for fungal spots on bean and pea pods and leaves.
Remove any sweetcorn cobs affected by smut, with swollen, grey or brown kernels that burst to release powdery fungal spores.
Check stored onions for softness and the grey or black mould of neck rot. Onion eelworm can cause swelling and distortion of onion plants, and rotting of stored bulbs.