Massenüberwinterung des FichtenquirllausrüßlersAnthribus nebulosus Forst. in Eichenrinde. (Col., Anthribidae)

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34. Deutsche Pflanzenschauitagung in Lübecktagung in Lübeck

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Zum Auftrefen der TanennadelgallmückeAgevillea abietis Hubault (Cecid. Dipt.) in Süddeutschland

Zusammenfassung Die TannennadelgallmückeAgevillea abietis Hubault(Cecid. Dipt.) tritt in Süddeutschland seit 1954 nachweisbar auf, wobei sie in Höhenlagen bis 500 m im Zuge örtlicher Massenvermehrungen an Jungtannen bis zu 15 Jahren merkliche Schäden verursacht.Klimatische und standörtliche Faktoren, die für das Zustandekommen von Übervermehrungen der Gallmücke ausschlaggebend sind, werden besprochen und Hinweise auf Bekämpfungsmöglichkeiten gegeben.     

Phoracantha semipunctata Fabr.(Col. Cerambycidae) in der Türkei

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III. Bücheranzeign

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Berzeichnik des in dem Jahre vom 2. Februar 1864/65 in den Fürftlich Fürftenbergifchen freien Jagden in Baden erlegten Mildes

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Untersuchungen über Fichtengallenläuse, Dreyfusia spp. (Hom., Adelgidae) und deren Predatoren in der Nord-Türkei

In the East Pontic mountains at Giresun (Black Sea shore) three species of the genus Dreyfusia have been established: D. nordmannianae Eckst. and D. prelli Grosm. on Abies nordmanniana Link. and Picea orientalis Link. and Dreyfusia nov. spec. on A. nordmanniana. The latter species, earlier known from Greece and the Balkans, but not yet described is most probably unholocyctic on fir.In the Zigana mountains between Trabzon and Gümüsane a species producing plenty galls on young P. orientalis trees and closely resembling D. merkeri Eichh. has been observed. Further investigations are necessary to evaluate whether or not it lives unholocyclic on spruce.In the West Pontic mountains near Bolu D. nordmannianae was intensively studied in twig infestations on A. bornmülleriana Mattf. The pattern of attack differs greatly from the one experienced in central Europe in that almost exclusively the current year's shoots are attacked whereas the leader and the older twig axis remain free of attack. In Europe all parts of the trees are colonized.Considering the known facts about generation- and morph sequences, morph determination and phenological behaviour of D. nordmannianae the characteristics of their population dynamics in Turkey and the interactions of the curious mode of attack and the extraordinary efficiency of their special predators have been completely evaluated.     

Die Verbreitung der Roßkastanien-Miniermotte Cameraria ohridella Desch. & Dimic (Lepid., Gracillariidae) in der Region Südtirol-Trentino

A survey on the present distribution of the horse chestnut leafmining moth, Cameraria ohridella Desch. & Dimic 1986, in Europe and in Italy is given: In Europe, within a period of 15 years, the leafminer – recently introduced into Central Europe – has settled in an area that spreads over 13 latitudinal and about 20 longitudinal degrees; in Northern Italy, an area of approximately 50,000 km² has been afflicted in the 5 years since the leafminer's introduction in South Tyrol and Julian Venetia in 1993.The development of the distribution in the region of South Tyrol and Trentino is shown: In the province of Bozen-South Tyrol, between 1995 and 1999 the moth has spread in all the three principal valleys (Eisacktal, Pustertal, Etschtal); in the Trentino province, first local attacks began only in 1998, near Trento and Riva, but spread over the entire Etschtal/Adige Valley in 1999. While in South Tyrol C. ohridella was introduced from the North (North Tyrol), the introduction into the Trentino occured from the South (Verona).At present the attacks in Trentino province are preponderantly low (resulting heavy only in the city of Trento and in Riva del Garda) and limited to altitudes ranging from 70 to 700 in. In South Tyrol, attacks are mainly heavy in altitudes ranging from 250 to 900/950 m, while they are low in the increasingly affected higher altitudes of 1,000 to 1,230 m. Numeric attack parameters are given to show attack intensities.The number of generations per year depends on the respective climatic conditions: in lower-altitudes, usually three generations develop in a year, but in higher altitudes (800 to 1,100 m) only two generations; in the climatically favoured area around the Lake Garda a (partial) fourth generation appears possible.The question of host plants (Aesculus sp., Acer sp.) and the larval parasitism of C. ohridella is discussed. The parasitism of the larvae, principally by Eulophidae (Hym., Chalcidoidea), was ascertained already in the first years of attack: In South Tyrol, 16 species of parasitoids appeared, and 8 in the Trentino province, but only two species were dominant: Minotetrastichus sp. and Pnigalio sp. The level of parasitism reached was low, comparable to other Central European countries.     

Beobachtungen über den MaiszünslerOstrinia nubilalis Hb. in Südwestdeutschland und Österreich in den Jahren 1961 and 1962

Zusammenfassung Im südbadischen Maisanbaugebiet sowie in Nieder?sterreich und im Burgenland wurden Untersuchungen ü ber die H?ufigkeit des Maiszünslers,Ostrinia nubilalis Hb. durchgeführt. Die Sch?den beschr?nkten sich in allen untersuchten Gebieten auf wenige Felder. Als besonders anf?llig erwies sich in Südbaden die Sorte „Badischer Landmais”. Hybridmais war dagegen sehr resistent. Aus den 1961 in ?sterreich gesammelten Larven schlüpften keine Parasiten. Die Parasitierung der 1961 bei Hartheim/Rh. gesammelten Raupen betrug 1,6%; als einziger Parasit schlüpfte die SchlupfwespeCampoplex alkae Ell. u. Sachtl. Aus den 1961 und 1962 erzielten Zuchtergebnissen und Beobachtungen im Freiland geht hervor, da?Ostrinia nubilalis unter ungünstigen ?kologischen Bedingungen eine mehrj?hrige Entwicklungszeit zu ben?tigen scheint.

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Summary In the corn growing region of southern Baden in Germany, in Lower Austria, and in Burgenland/Austria a survey on the abundance of the European corn borer,Ostrinia nubilalis Hb., was conducted. In all checked areas the damage caused by corn borer larvae was restricted to a few fields. The corn strain „Badischer Landmais”, cultivated in southern Baden, was proved to be the most susceptible one, hybrid corn was more resistant to corn borer infestations. From larvae, collected in Austria in 1961, no parasites emerged. The parasitization of the larvae collected near Hartheim/Rhein in 1961 was 1,6%. The only parasite was theichneumonid Campoplex alkae Ell. and Sachtl. After having reared the insect under field conditions, and after numerous field observations, it appears thatOstrinia nubilalis Hb. needs under unfavorable ecologic conditions more than one year for its development.