Nigel Cattlin / Section through edemas (also known as oedemas / cankers) abiotic swellings on the stem of a purple brussel sprout plant (Brassica oleracea)

Nigel Cattlin / Leaf canker (Leptosphaeria maculans) lesion with black pycnidia on the leaf of Oilseed rape (Brassica napus) .

Nigel Cattlin / Shot hole (Pseudomonas syringae morsprunorum) a bacterial disease causing lesions and 'shot-hole' effect in a plum leaf

Nigel Cattlin / Leaf canker or black leg disease (Leptosphaeria maculans) crop disease lesion and pycnidia on oilseed rape leaf

Nigel Cattlin / Nectria pear canker (Neonectria ditissima) lesion with living green and dead brown leaves on a pear branch, Berkshire, England, UK, June

Nigel Cattlin / Nectria pear canker (Neonectria ditissima) lesion with living green and dead brown leaves on a pear branch, Berkshire, England, UK, June

Nigel Cattlin / Nectria pear canker (Neonectria ditissima) lesion with living green and dead brown leaves on a pear branch, Berkshire, England, UK, June

Nigel Cattlin / Nectria pear canker (Neonectria ditissima) lesion with living green and dead brown leaves on a pear branch, Berkshire, England, UK, June