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Plantwise Factsheets for Farmers

Calcium against Blossom end rot of Chillies and Tomatoes


Recognize the problem

Blossom end rot of chillies and tomatoes is a problem that is caused by calcium deficiency. During blossom end rot, the skin of the fruit becomes fragile. The skin at the end of the fruit where the flower grew splits, rots and develops a circular spot. The rot causes the skin of the fruit to turn greenish brown to black. As the rot expands, it allows other diseases to enter the fruit which affects the production of the crop.


Blossom end rot develops when the fruit does not receive enough calcium. It may develop when the plant is deficient in water because this prevents sufficient calcium from reaching the end of the fruit.


  • Make sure the crop is well watered so that enough nutrients get to the whole plant
  • Apply a layer of mulch to help maintain even moisture
  • Add 24kg Potash / acre so that fruit becomes healthier and less susceptible to disease attack
  • Spray the foliage with  calcium chloride when symptoms first appear

The recommendations in this factsheet are relevant to: Pakistan

Authors: Directorate General Agriculture
Ext. & A. R.
©CAB International. Published under a CC-BY-SA 4.0 licence.

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