An effective method of raising caterpillars of the becker's white is to place caterpillars on cuttings of pinnate tansymustard (Descurainia pinnata), dyar's woad (Isatis tinctoria), tumble mustard (Sisymbrium altissimum), princes plume (Stanleya pinnata), rocky mountain beeplant (Cleome serrulata) black mustard (Brassica nigra) or any other suitable mustard host.  Place cuttings in bottled water and place inside a five or six gallon bucket.  Cut a hole out of the lid and fasten butterfly net material around the hole so that caterpillars can't escape.  Remove frass and provide fresh plant every four to five days!