On the bionomics a little known sawfly Nematus (= Pteronidea) melanocephalus Htg. (Tenthredinidae, Hymenoptera) on willows

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F99%3A42400005" target="_blank" >RIV/62156489:43410/99:42400005 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
On the bionomics a little known sawfly Nematus (= Pteronidea) melanocephalus Htg. (Tenthredinidae, Hymenoptera) on willows
Original language description
The sawfly Nematus melanocephalus Htg. is a species little known to biologists and foresters, which occasionally shows local mass outbreaks on smooth-leaved species of genera Salix, Ulmus, Populus, Corylus and Betula. In I998 the sawfly (whose . occurrence in the Czech Republic was surprisingly evidenced only in Moravia) exhibited a sudden overpopulation on the willow S.fragilis L.in an old riparian and accompanying stand along the Svratka River in the Brno region.The sawtly has two generations in a year.Its protandric adults hatch in May and lay eggs under the lower epidermis of leaves.The average physiological natality amounts to 62.5 eggs,the average actual natality being 42.6 eggs.In captivity,the male adults live some 4.5(females only 3.5)days. The embryonal development lasts frolt 6 to 7 days. The fertilized eggs give rise to both males and females, the unfertilized eggs produce only males. The male larvae have four to five (females five) instars. The first instar larvae usually
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
GK - Forestry
OECD FORD branch
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Publication year
1999
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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