He also studies insects that eat these plants (Longitarsus) which contain pyrrolizidine alkaloids and what makes them choose which plants they eat.
Pieter Bruegel the Elder | Pieter Brueghel | Pieter Mulier II | Pieter Hintjens | Pieter Wispelwey | Pieter Willem Korthals | Pieter Vreede | Pieter van Vollenhoven | Pieter van Musschenbroek | Pieter Vanderlyn | Pieter Teyler van der Hulst | Pieter Snapper | Pieter Rossouw | Pieter Langendijk | Pieter Kasteleyn | Pieter Hugo | Pieter Feith | Pieter de Ring | Pieter de Hooch | Pieter Bourke | Pieter Bleeker | Pieter Aertsen | Professor Pelser and a leaf of ''Senecio fistulosus | Pieter Zeeman | Pieter van der Hulst | Pieter van den Hoogenband | Pieter Seelaar | Pieter Rijke | Pieter Paulus | Pieter Nuyts |