Young plants of the species liable to attack may be inoculated with the conidia of the species of Peronospora usually developed on that particular host, in the same manner that young cruciferous plants, watered with an infusion of the spores of Cystopus candidus, will soon exhibit evidence of attack from the white rust.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke
It is now, however, so rare that it seems to feed chiefly upon wild cruciferous plants and is more likely to be found along the borders of open woods than in gardens and fields.
"Butterflies Worth Knowing"
Clarence M. Weed
These lay eggs upon various cruciferous plants which hatch into greenish caterpillars that eat the leaves and soon mature so far as their caterpillar stage is concerned.
"Butterflies Worth Knowing"
Clarence M. Weed