The effect of an IPM program on parasitoid populations of leaf miners | [Effet d'un programme de lutte intégrée sur des populations de parasitoïdes de mineuses foliaires]
1999
Balazs, K. ((Hungary Academy of Sciences, Budapest (Hongrie). Plant Protection Institute)) | Jenser, G.
The leaf miner communities were investigated in conventional and IPM orchards. In the last years were recorded in the apple orchards a mass occurrence of 3 leaf miner species: Phyllonorycter corylifoliella Haw., Ph. blancardella Fabr., Leucoptera malifoliella Costa. The larvae of leaf miners were parasitized to 20-45 /. The number of parasitoids was higher in the conventional orchard than in the IPM one, maybe due to the higher population density of leaf miners. At the same time the proportion of parasitized larvae was higher in the IPM orchard. Here (in IPM technology) the parasitoids are able to reduce the leaf miner population density to the economic threshold level. The most important parasitoid species were: Sympiesis sericeicornis Nees, S. gordius Walk., S. acalle Walk., Chrysocharis pentheus Walk., Neochrysocharis formosa Walk., Pnigalio pectinicornis L., Minotetrastichus ecus Walk., Cirrospilus lyncus Walk. (Chalcidoidea), Pholetesor bicolor Nees (Braconidae)
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