Why are patches on my tomato fruit not ripening?
Posted by Dobies Staff on 15 April 2014 01:59 pm

A tomato fruit not fully ripening is due to disorders known as Blotchy Ripening and Green Back.

Blotchy Ripening is the development of unevenly ripe fruit which have green or yellow patches. In the case of Green Back the area around the stalk fails to ripen properly or remains green.

Both disorders can occur if there is a deficiency of potassium and when the greenhouse temperatures become high and the fruit is exposed to strong sunlight. Ventilate the greenhouse as much as possible in hot weather and damp down the pathway to reduce the temperature. Light shading may also need to be applied to the glass. Feed the plants regularly with a liquid tomato food once the first fruit start to develop.

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