Brassolis isthmia (Lepidoptera: Nymphalidae) in peach palm and coconut palm in Costa Rica.
DOI:
https://doi.org/10.15517/am.v22i1.11834Keywords:
Butterfly life cycle, Brassolinae, Bactris gasipaes, Cocos nucifera.Abstract
The life
cycle of Brassolis isthmia was studied under field and
laboratory conditions in Guapiles, Limon, Costa Rica. This
study was carried out between September and November,
1994, during an insect outbreak in a peach palm plantation.
During the following years were conducted observations of
the butterfly feeding activities on coconut palms, in several
localities of the Caribbean slopes too. Several hundred eggs
and larvae in the first instar were collected and placed in
groups of ten individuals, and fed with pieces of peach palm
leaves of 30 x 80 mm. The number of larvae necessary to
cause defoliations of 5 and 20% was calculated for each
larval developmental stage. Average development took 159
days, distributed as follows: egg 20, larval 114, pupal 20, and
adult 5 days. The larvae are gregarious, feed during the night
and remain during the day in nests constructed with debris of
dry leaves and silk. The consumption rate during the larval
stage was of 820.62 cmÇ; the seventh instar accounts for
72.8% of this.
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