Following the recent advances in genomics, including changes in the classification of the Clavibacter genus, we have reviewed our specifications for AS and A Level Biology A.

Having consulted with the British Society of Plant Pathology, we confirm the term ring rot should no longer be used in relation to tomatoes. The bacteria responsible for ring rot in potatoes causes bacterial canker in tomatoes.

We’ve therefore removed the reference to ring rot in tomatoes from our specifications as follows:

• AS Level Biology A (H020): Section 4.1.1(a) Additional guidance on page 24 – see specification (version 3.2).
• A Level Biology A (H420): Section 4.1.1(a) Additional guidance on page 26 – see specification (version 3.3).

You can view and download the amended specifications from the qualification page on our website and Teach Cambridge.

These amendments are immediate and apply for first assessment in June 2025.

Please make sure you’re using the latest specifications with your students.

If you have any queries about this update, please call our Customer Support Centre on 01223 553998 or email science@ocr.org.uk. 

Qualification

• Biology A - H020, H420 (from 2015)