Adult and larval leaf beetles feed on all sorts of plant tissue. Their diversity has run parallel with that of the Angiosperms. Many are serious pests of cultivated plants, for example the Colorado potato beetle ("Leptinotarsa decemlineata"), the asparagus beetle ("Crioceris asparagi"), the cereal leaf beetle ("Oulema melanopus"), and various flea beetles. A few act as vectors of plant diseases. Others can be used as biocontrol of invasive weeds. Most Chrysomelidae are conspicuously coloured, often in glossy yellow to red or metallic blue-green hues. Some (especially Cassidinae) have spectacularly bizarre shapes. They are highly popular among insect collectors.