- Both beetles consistently
prefer salicylate-rich over salicylate-poor
- Preference in the laboratory
is closely related to beetle abundance in the
- These results supported the
prediction that beetles should prefer
- In California, larvae grew
equally well on four willow species that
differed in salicylate content.
- In Finland, larvae grew
fastest on the species that they prefer to eat,
they grew most slowly on the salicylate-poor
- Growth rates in the field
were consistent with growth in the
Larval growth on three Finnish willows:
Salix myrsinifolia, S. pentandra, and
Larval survival on two Californian willow species.
- In California,
usually survived equally well on salicylate-rich
and on salicylate-poor willows.
- Larval survival was related
to the water content of the leaves. Water
contents were unusually low during this period,
which coincided with the California
Larval survival on three Finnish willow species.
- In Finland, P. vitellinae larval survival was not related to
host plant salicylate content.
- Larval survival was lowest
on the salicylate-rich species S. pentandra.