days to 50% flowering, plant height, number of basal leaves, longest basal leaf length, number of fruit bearing branches, umbels per plant, umbellets
per plant, seeds per umbel, seed yield per plant, 100-seed weight, days to maturity and harvest index.
During its development, the parsnip webworm spins copious amounts of silk with which it binds together umbellets within an umbel.
After hatching, larvae move to a developing umbel, where they spin a web around several umbellets and begin feeding on florets.
In both of the webworm-infested umbels, all but two umbellets were webbed together by the caterpillar with silk.
When webworms [TABULAR DATA FOR TABLE 1 OMITTED] inhabit an umbel, their silk deforms the broad circular face of the flower and sequesters many of the umbellets within the silk.