Sökning: "leaf-beetle"

Hittade 4 uppsatser innehållade ordet leaf-beetle.

  1. 1. Effects of leaf beetle herbivory on pollination success and fruit development in woodland strawberry Fragaria vesca

    Master-uppsats, SLU/Dept. of Ecology

    Författare :Lisa Malm; [2013]
    Nyckelord :herbivory; pollination success; pollinator reference; fruit development; fruit yield; leaf beetles; Galerucella tenella; Galerucella sagittariae; Fragaria vesca;

    Sammanfattning : Cultivating well-developed and marketable garden strawberries (Fragria x ananassa) and woodland strawberries (Fragaria vesca) depends on successful pollination by insects. Organic garden strawberry plantations harbour higher pollinator densities and have been shown to produce bigger and better developed fruits than conventional farms. LÄS MER

  3. 2. Abundance of syrphid larvae in willow plantations : role of habitat type, prey (Phratora vulgatissima) availability and interactions with other natural enemies

    L3-uppsats, SLU/Dept. of Ecology

    Författare :Hans Johansson; [2009]
    Nyckelord :intraguildpredation; hover fly; foraging behaviour; heteropteran; willow plantation; surrounding habitat; biocontrol; leaf-beetle; mirid; anthocorid;

    Sammanfattning : A large number of hover fly species are as larvae effective predators and often feed on insect pests in plantations. The leaf-beetle Phratora vulgatissima is a common pest in willow plantations and the aim of this study is to study what may affect the presence of hover flies in this system. LÄS MER

  4. 3. Biology of Lilioceris lilii(Coleoptera:Chrysomelidae) and the occurrence of their parasitoids in Sweden

    Magister-uppsats, SLU/Dept. of Plant Protection Biology

    Författare :Helena Kroon; [2009]
    Nyckelord :Lilioceris lilii; conservation biological control; Lemophagus errabundus; Lemophagus pulcher; Tetrastichus setifer; Diaparsis jucunda; Mesochorus lilioceriphilus; Lilioceris merdigera; Sweden; survey;

    Sammanfattning : Sammanfattning: Liljebaggen, Lilioceris lilii (Scopoli) är den största skadegöraren på liljor tillhörande släktena Lilium och Fritillaria, och är ett problem i Sverige liksom i övriga Europa, Nord-Amerika och Asien. Skadan orsakas främst av larverna, men även av fullvuxna baggar, som äter på plantans blad, knoppar och blommor (Ernst, 2005). LÄS MER

  5. 4. Biologin hos svenska Lilioceris arter och åtgärder för att begränsa deras skadeverkningar

    L3-uppsats, SLU/Dept. of Plant Protection Biology

    Författare :Agneta Johansson; [2007]
    Nyckelord :liljebaggar; skadeverkningar; lökbaggar; Lilioceris; liljor;

    Sammanfattning : The leaf beetles, Lilioceris lilii and L. merdigera have existed in Asia, Europe and in North Africa for a long time, but have become much more abundant the last twenty-five years. Even North America has been affected during the last years. LÄS MER