By Gandd
London,
United Kingdom 
How do I eliminate brown spots in quince fruit?
19 Oct, 2010
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If your quince is a Cydonia, and the brown spots were only on the outside in the skin of the fruit, this is usual and not a problem.
If the leaves of the plant were affected with brownish red spots, as well as the fruits, and the fruits were distorted, that could be a fungal infection.
25 Oct, 2010