An agricultural cloche is made curved sections of plastic. These are reinforced by wires in the longitudinal and transverse direction. A number of arched pieces is placed over the sections at regular intervals and pressed against them. The cloche is simple to erect and dismantle. It is very strong and the sections are regular and evenly stressed. U shaped hooks are used to support the sections near the ground. The hooks are pushed into the ground. The sections are made from coloured polythene.