Incidence of Infestation on Mountain Pine (Pinus mugo Turra) by the Needle‐Shortening Gall Midge Thecodiplosis brachyntera (Schwägr.) Diptera, Cedidomyiidae)
Identifieur interne : 003D33 ( Main/Exploration ); précédent : 003D32; suivant : 003D34Incidence of Infestation on Mountain Pine (Pinus mugo Turra) by the Needle‐Shortening Gall Midge Thecodiplosis brachyntera (Schwägr.) Diptera, Cedidomyiidae)
Auteurs : Václav Skuhrav [République tchèque]Source :
- Zeitschrift für Angewandte Entomologie [ 0044-2240 ] ; 1972-01-12.
Abstract
Abstract: The incidence of infestation on mountain pine (Pinus mugo Turra) by the needle‐shortening gall midge Thecodiplosis brachyntera (Schwägr.) was investigated in the years 1967–1970 during an outbreak of this pest in the Krkonoše mountains in north‐eastern Bohemia. The incidence of infestation throughout the area surveyed appeared to be very irregular and concentrated in foci. The data obtained were compared with the published report of Nelson, Shields and Platt (1969) establishing the incidence of infestation by the pine needle gall fly, Itonida pinirigidae Pack., on Pinus taeda Mill. and P. echinata Mill. The infestation was correlated with radiation exposures of 2000–2599 rads 2 years previously. On the basis of our studies of the dispersal of the needle‐shortening gall midge Thecodiplosis brachyntera on mountain pines in Czechoslovakia, we assume that in cases of increased occurrence of I. pinirigidae on Pinus taeda and P. echinata Mill. in an area irradiated with 2000–2599 rads there is no correlation with the effects of radiation, but a mere irregular dispersal of this pest under natural conditions. Zusammenfassung: Verbreitung der Kiefernnadelgallmücke Thecodiplosis brachyntera (Schwägr.) (Diptera, Cecidomyiidae) an der Bergkiefer (Pinus mugo Turra) In den Jahren 1967–1970 wurde im Krkonoše‐Gebirge in Böhmen das Vorkommen der Kiefernnadelgallmücke Thecodiplosis brachyntera (Schwägr.) an der Bergkiefer (Pinus mugo Turra) auf einer Fläche von 13 km2 in 1200–1500 m Höhe untersucht. Der Befall war hier sehr unregelmäßig (Abb. 3 und 4). Die in der ČSSR gewonnen Daten werden mit den Angaben von Nelson, Shields und Platt (1969) aus den USA verglichen. Diese Autoren stellten eine Korrelation zwischen der Vorkommensdichte von Itonida pinirigidae Pack. an Pinus taeda Mill. und Pinus echinata Mill. einerseits und der künstlichen Bestrahlung des Geländes mit Dosen von 2000–2599 Rads andererseits fest. Auf Grund der Untersuchungen über die Dispersion der Befallsdichte der Kiefernnadelgallmücke Thecodiplosis brachyntera (Schwägr.) an der Bergkiefer in der Tschechoslowakei wird aber vermutet, daß die erhöhte Dichte von Itonida pinirigidae an Pinus taeda und Pinus echinata nicht durch die erhöhte Strahlenmenge, sondern durch die fokusförmige unregelmäßige Dispersion der Gallmücke zu erklären ist.
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DOI: 10.1111/j.1439-0418.1972.tb02242.x
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Diptera, Cedidomyiidae)</title><author><name sortKey="Skuhrav, Vaclav" sort="Skuhrav, Vaclav" uniqKey="Skuhrav V" first="Václav" last="Skuhrav">Václav Skuhrav</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:6B2E397E0DA6276AF2988C5407B370241AAAC890</idno><date when="1972" year="1972">1972</date><idno type="doi">10.1111/j.1439-0418.1972.tb02242.x</idno><idno type="url">https://api.istex.fr/document/6B2E397E0DA6276AF2988C5407B370241AAAC890/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001868</idno><idno type="wicri:Area/Istex/Curation">001868</idno><idno type="wicri:Area/Istex/Checkpoint">001869</idno><idno type="wicri:doubleKey">0044-2240:1972:Skuhrav V:incidence:of:infestation</idno><idno type="wicri:Area/Main/Merge">003F02</idno><idno type="wicri:Area/Main/Curation">003D33</idno><idno type="wicri:Area/Main/Exploration">003D33</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Incidence of Infestation on Mountain Pine (Pinus mugo Turra) by the Needle‐Shortening Gall Midge Thecodiplosis brachyntera (Schwägr.) Diptera, Cedidomyiidae)</title><author><name sortKey="Skuhrav, Vaclav" sort="Skuhrav, Vaclav" uniqKey="Skuhrav V" first="Václav" last="Skuhrav">Václav Skuhrav</name><affiliation wicri:level="3"><country>République tchèque</country><placeName><settlement type="city">Prague</settlement><region type="région" nuts="2">Bohême centrale</region></placeName><wicri:orgArea>Institute of Entomology, Czechoslovak Academy of Science</wicri:orgArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Zeitschrift für Angewandte Entomologie</title><idno type="ISSN">0044-2240</idno><idno type="eISSN">1439-0418</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1972-01-12">1972-01-12</date><biblScope unit="volume">72</biblScope><biblScope unit="issue">1‐4</biblScope><biblScope unit="page" from="267">267</biblScope><biblScope unit="page" to="272">272</biblScope></imprint><idno type="ISSN">0044-2240</idno></series><idno type="istex">6B2E397E0DA6276AF2988C5407B370241AAAC890</idno><idno type="DOI">10.1111/j.1439-0418.1972.tb02242.x</idno><idno type="ArticleID">JEN2242</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0044-2240</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: The incidence of infestation on mountain pine (Pinus mugo Turra) by the needle‐shortening gall midge Thecodiplosis brachyntera (Schwägr.) was investigated in the years 1967–1970 during an outbreak of this pest in the Krkonoše mountains in north‐eastern Bohemia. The incidence of infestation throughout the area surveyed appeared to be very irregular and concentrated in foci. The data obtained were compared with the published report of Nelson, Shields and Platt (1969) establishing the incidence of infestation by the pine needle gall fly, Itonida pinirigidae Pack., on Pinus taeda Mill. and P. echinata Mill. The infestation was correlated with radiation exposures of 2000–2599 rads 2 years previously. On the basis of our studies of the dispersal of the needle‐shortening gall midge Thecodiplosis brachyntera on mountain pines in Czechoslovakia, we assume that in cases of increased occurrence of I. pinirigidae on Pinus taeda and P. echinata Mill. in an area irradiated with 2000–2599 rads there is no correlation with the effects of radiation, but a mere irregular dispersal of this pest under natural conditions. Zusammenfassung: Verbreitung der Kiefernnadelgallmücke Thecodiplosis brachyntera (Schwägr.) (Diptera, Cecidomyiidae) an der Bergkiefer (Pinus mugo Turra) In den Jahren 1967–1970 wurde im Krkonoše‐Gebirge in Böhmen das Vorkommen der Kiefernnadelgallmücke Thecodiplosis brachyntera (Schwägr.) an der Bergkiefer (Pinus mugo Turra) auf einer Fläche von 13 km2 in 1200–1500 m Höhe untersucht. Der Befall war hier sehr unregelmäßig (Abb. 3 und 4). Die in der ČSSR gewonnen Daten werden mit den Angaben von Nelson, Shields und Platt (1969) aus den USA verglichen. Diese Autoren stellten eine Korrelation zwischen der Vorkommensdichte von Itonida pinirigidae Pack. an Pinus taeda Mill. und Pinus echinata Mill. einerseits und der künstlichen Bestrahlung des Geländes mit Dosen von 2000–2599 Rads andererseits fest. Auf Grund der Untersuchungen über die Dispersion der Befallsdichte der Kiefernnadelgallmücke Thecodiplosis brachyntera (Schwägr.) an der Bergkiefer in der Tschechoslowakei wird aber vermutet, daß die erhöhte Dichte von Itonida pinirigidae an Pinus taeda und Pinus echinata nicht durch die erhöhte Strahlenmenge, sondern durch die fokusförmige unregelmäßige Dispersion der Gallmücke zu erklären ist.</div></front></TEI><affiliations><list><country><li>République tchèque</li></country><region><li>Bohême centrale</li></region><settlement><li>Prague</li></settlement></list><tree><country name="République tchèque"><region name="Bohême centrale"><name sortKey="Skuhrav, Vaclav" sort="Skuhrav, Vaclav" uniqKey="Skuhrav V" first="Václav" last="Skuhrav">Václav Skuhrav</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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