To a large extent tomatoes can balance their nutrition and other physiological factors, but the practice of de-leafing can upset this balance and make tomatoes more prone to fruit ripening problems. De-leafing makes fruits easier to see and harvest and helps to reduce disease levels, but it should be kept to a minimum and be carried out no higher than the lowest truss of ripening fruits.Ĭontrol temperature and sunlight levels carefully to avoid extremes, using combinations of heating, ventilation, shade netting and white greenhouse paint as appropriate.Ĭhoosing greenback-resistant cultivars will help avoid greenback and whitewall. Seed catalogues should list current greenback-resistant cultivars. Pale patches that fail to ripen can also be caused by variable water and nutrient levels. Greenback and the internal white or yellowish discolouration (sometimes called ‘whitewall’) are problems caused by excess light and temperature and insufficient potassium fertiliser during fruit development and ripening. They are usually found on greenhouse rather than outdoor tomatoes. Tomatoes are particularly prone to what are known as physiological disorders: abnormal growth caused by non-infectious factors. This is partly due to the difficulty of controlling the sensitive requirements for temperature, nutrients and light.
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