Ultraviolet radiation is at the other end of the spectrum to infrared and has several effects relevant to plants. It can stimulate the germination of some seeds, cause the death of plant tissue, is responsible for blackening of rose petals, help formation, activation, deactivation of certain plant pigments, some insects need it for vision and it is necessary for the sporulation of certain fungi. Crop cover can be formulated to filter out certain UV wavelengths and reduce some of these effects.
