Tag Archives: larval parasitism

548-554 E. Veromann, M. Saarniit, R. Kevväi and A. Luik
Effect of crop management on the incidence of Meligethes aeneus Fab. and their larval parasitism rate in organic and conventional winter oilseed rape
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Effect of crop management on the incidence of Meligethes aeneus Fab. and their larval parasitism rate in organic and conventional winter oilseed rape

E. Veromann, M. Saarniit, R. Kevväi and A. Luik

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences,Kreutzwaldi 1, 51014 Tartu, Estonia; e-mail: eve.veromann@emu.ee

Abstract:

The occurrence of Meligethes aeneus adults, larvae and larval parasitism rate was studied in organic and conventional winter oilseed rape fields in Estonia. No insecticides were used in fields with either management. In the conventional field, significantly more M. aeneus adults and larvae were found than in the organic field, whereas the larval parasitism rate was significantly greater in the organic winter rape field. This study showed that organic cropping system enhanced the occurrence of parasitoids and diminished the incidence of pest attack in winter oilseed rape.

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447-450 E. Veromann, A. Luik and R. Kevväi
The impact of field edges on the incidence of Meligethes aeneus Fab. larvae and their parasitisation in spring and winter oilseed rape
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The impact of field edges on the incidence of Meligethes aeneus Fab. larvae and their parasitisation in spring and winter oilseed rape

E. Veromann, A. Luik and R. Kevväi

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences,Kreutzwaldi St. 64, EE51014 Tartu, Estonia; e-mail: eve.veromann@loodusfoto.ee

Abstract:

The occurrence of Meligethes aeneus larvae and their parasitism rate was studied at the edges and in the centres of commercial spring and winter oilseed rape fields in Estonia. Insecticides were used in spring oilseed rape but not in winter oilseed rape fields. Significantly more larvae were found at the field edges than in centres of both crops, but they were more abundant in winter oilseed rape. The larval parasitism rate was significantly greater at field edges than in centres only in winter rape; in spring oilseed rape parasitism was more evenly distributed. But there were no differences in pollen beetle parasitisation rates between crops.

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