On the natural history of the willow sawfly Nematus oligospilus (Hymenoptera, Tenthredinidae) inhabiting Salix humboldtiana, in Colombia

The willow sawfly, Nematus oligospilus Förster, has recently been recorded from Colombia. Natural populations were searched for in Bogotá City, where one of the host plants, Salix humboldtiana , grows as an ornamental tree. Larvae and cocoons were found, which thrive on the leaves of this plant. Par...

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Bibliographic Details
Published in:Journal of Hymenoptera research 2017-04, Vol.55 (55), p.189-199
Main Authors: Malagón-Aldana, Leonardo A, Serna, Francisco, Smith, David R
Format: Article
Language:English
Subjects:
Body length
Cocoons
Eggs
Fecundity
Host plants
Instars
Leaves
Natural history
Nematus oligospilus
Nematus ventralis
Ornamental plants
Salix humboldtiana
Sawflies
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Summary:The willow sawfly, Nematus oligospilus Förster, has recently been recorded from Colombia. Natural populations were searched for in Bogotá City, where one of the host plants, Salix humboldtiana , grows as an ornamental tree. Larvae and cocoons were found, which thrive on the leaves of this plant. Parthenogenetic reproduction of this sawfly was confirmed. Fecundity of every female was estimated through counting the number of eggs laid on the leaves of the host. In addition, some variations in the color pattern of the adult are described and several of its morphological traits measured. For the larval stage, the body length of each instar was measured and their stadium (intermoult period or instar duration) calculated. Six larval instars were observed regularly; only one case of seven instars occurred.
ISSN:1070-9428
1314-2607
DOI:10.3897/jhr.55.11566