Shaping the Mould

I don't know. Are these crab apples or something else? Maurice? Anyway I was taking various stuff down to the compost heap and noticed this en route. I was really interested why the mould has grown in circles. So I Googled this and at www.newscientist.com they told me this (but essentially (I think) new spores are produced during each period of daylight and in the meantime the spores eat outwards): 

This is brown rot disease which is caused by the pathogenic fungus Monilinia fructigena. This is a very common and widespread disease of apples, pears and stone fruits and spreads through the air as spores. The spores germinate on areas of damaged fruit, attacking it where the fungus has easy access to the unprotected, nutrient-rich fleshy parts inside.

The fungal threads, or hyphae, grow and branch within the tissue and degrade the flesh. At first, the disease is invisible to the naked eye, but as it spreads, the pear responds with the typical "browning" reaction seen in the photograph which gives the disease its name.

As it grows, daylight prompts the fungus to produce more spores on specialised hyphae which grow back out of the skin, forming the grey-brown pustules. 

A new crop of fungal spores is therefore produced with each period of daylight, and the fungus continues to grow through the flesh forming successively larger rings each day, giving this typical appearance.

New spores are produced with each period of daylight leading to the appearance of rings