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Titre du document / Document title

Egg distribution and survival of Cinara pilicornis (Hartig) (Hom., Lachnidae) on damaged and undamaged Norway spruce (Picea abies) (L.) Karst

Auteur(s) / Author(s)

STADLER B. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Bayreuth Institute for Terrestrial Ecosystem Research, University of Bayreuth, 95440 Bayreuth, ALLEMAGNE

Résumé / Abstract

The spruce shoot aphid (C. pilicornis) (Hartig) lives on Norway spruce (P. abies (L.) Karst.) and deposits its overwintering eggs on current year needles. Ovipara density and the distribution of their eggs on trees at two different sites of the Fichtelgebirge (north-east of Bavaria), with host trees showing either heavy symptoms of needle-yellowing (Oberwarmensteinach) or look green and healthy (Waldstein) is investigated. In addition, winter mortality of eggs and egg development until birth of the fundatrices is followed. Host plant quality does not seem to influence the proportion of eggs surviving to spring. Also, the biomass of developing first instar larvae of the fundatrices was independent of the degree of needle yellowing. However, significantly more eggs/shoot and eggs/twig were found on hosts without growth disturbance which is due to a higher ovipara density and a higher fecundity of individual ovipara. Damaged or stressed trees do not seem to be better hosts for C. pilicornis. A significant correlation was found between the biomass of first instar larvae of fundatrices and the time of egg hatching. The high phenotypic plasticity of C. pilicornis on good quality plants is discussed and potential implications for forestry are assessed.

Revue / Journal Title

Journal of applied entomology    ISSN  0931-2048 

Source / Source

1997, vol. 121, no2, pp. 71-75 (36 ref.)

Langue / Language

Anglais

Editeur / Publisher

Wiley-Blackwell, Berlin, ALLEMAGNE  (1986) (Revue)

Mots-clés anglais / English Keywords

Pest behavior

;

Egg laying behavior

;

Survival

;

Damage

;

Host plant

;

Forest decline

;

Spatial distribution

;

Population density

;

Picea abies

;

Cinara pilicornis

;

Foundress insect

;

Oviparity

;

Bavaria

;

Coniferales

;

Gymnospermae

;

Spermatophyta

;

Lachnidae

;

Aphidoidea

;

Homoptera

;

Insecta

;

Arthropoda

;

Invertebrata

;

Germany

;

Europe

;

Softwood forest tree

;

Pest

;

Mots-clés français / French Keywords

Comportement déprédateur

;

Comportement ponte

;

Survie

;

Dégât

;

Plante hôte

;

Dépérissement forêt

;

Répartition spatiale

;

Densité population

;

Picea abies

;

Cinara pilicornis

;

Fondatrice insecte

;

Oviparité

;

Bavière

;

Coniferales

;

Gymnospermae

;

Spermatophyta

;

Lachnidae

;

Aphidoidea

;

Homoptera

;

Insecta

;

Arthropoda

;

Invertebrata

;

Allemagne

;

Europe

;

Arbre forestier résineux

;

Déprédateur

;

Mots-clés espagnols / Spanish Keywords

Conducta depredadora

;

Conducta puesta

;

Sobrevivencia

;

Estrago

;

Planta huesped

;

Marchitez bosque

;

Distribución espacial

;

Densidad población

;

Picea abies

;

Cinara pilicornis

;

Fundatriz insecto

;

Oviparidad

;

Baviera

;

Coniferales

;

Gymnospermae

;

Spermatophyta

;

Lachnidae

;

Aphidoidea

;

Homoptera

;

Insecta

;

Arthropoda

;

Invertebrata

;

Alemania

;

Europa

;

Arbol forestal resinoso

;

Plaga

;

Localisation / Location

INIST-CNRS, Cote INIST : 6353, 35400006568456.0020

Nº notice refdoc (ud4) : 2671118



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