Mix some plant sap — such as giant hogweed — with sunlight and you'll find phyto plus photo equals dermatitis, an itchy skin rash.

It's the combo of plant sap and sunlight, which can produce an irritating rash.

In the early summer, froghopper nymphs cover themselves in a froth-like mass, which protects them from desiccation, then feed on the plant sap and cause wilting.

The plant sap and leaves are reputed to be toxic, and decaying leaves from the plant are toxic to other species of plant.

The media workers also gain subsistence from plant sap they ingest whilst physically cutting out sections of leaf from a variety of plants.

The summer heat was brief but still enough to sap strength and enthusiasm.

This not only saps strength but can leave a boxer severely dehydrated from the efforts to make the weight.

She looks like a frail creature, but she slowly saps strength with the passing years.

They say sticky sap, berries and blossom are making a mess of paths, a car park and their cars.

Avoid parking the car near trees as these will drip sticky sap and also attract birds.

She twitches when she sees a nervous normal step towards the sweet, sticky sap of live broadcasting.

Like all euphorbias, all parts of the plant are toxic if ingested, and cut stems produce an irritant sticky sap.

The flower parts are often covered with a sticky sap.