Nigel Cattlin / Large flower heads of Euphorbia characias 'Black Pearl' plant in full flower, Berkshire, April Berkshire, England, UK.

Nigel Cattlin / Bacterial blight (Xanthomonas oryzae) disease exudation on Rice (Oryza sativa) leaves , Philippines.

Nigel Cattlin / Bacterial blight (Xanthomonas oryzae pv oryzae) bacterial extrusion from the infected Rice (Oryza sativa) leaf, Luzon, Philippines

Nigel Cattlin / Barley (Hordeum vulgare) seedling emerging from the soil after germination. Translucent coleoptile with exudation droplet with green of the first foliage leaf just appearing.

Nigel Cattlin / Pear-shaped exudation droplet of transpired water on the tip of a barley leaf, sparkling in light from behind

Nigel Cattlin / Cytospora canker (Cytospora leucostoma) canker disease exudation from a peach tree trunk, USA, September

Nigel Cattlin / Severe bacterial blight Pseudomonas syringae) gummosis exudation on the trunk of a crop peach tree

Nigel Cattlin / Sap / latex exuding from cuts in the seedpod of an Opium poppy (Papaver somniferum) an annual garden ornamental and a source of opiate narcotics

Nigel Cattlin / Damage and exudation gum caused by red plum maggot (Cydia funebrana) feeding on young plum fruit

Nigel Cattlin / Damage and exudation gum caused by red plum maggot (Cydia funebrana) feeding on young plum fruit