Das Projekt "Effects of plant density and host plant architecture on abundance and level of parasitism of stem boring pests in oilseed rape" wird vom Umweltbundesamt gefördert und von Universität Göttingen, Department für Nutzpflanzenwissenschaften, DNPW Abteilung Agrarpedologie durchgeführt. The work focuses on the oilseed rape stem-boring pests cabbage stem flea beetle (Psylliodes chrysocephala), rape stem weevil (Ceutorhynchus napi) and cabbage stem weevil (Ceutorhynchus pallidactylus) and their parasitoids. Different plant densities influence among other things plant size, stem diameter and the number of lateral racemes. The effects of these host plant factors on the abundance and within-plant distribution of the larvae of the above mentioned pests is examined. The level of parasitism referring to the within-plant distribution of the larvae and the larval instars is detected. Furthermore an analysis of the chemical cues for the host finding behaviour of the parasitoids is made. The project is part of the MASTER-program (Management Strategies for European Rape Pests). In this program integrated pest management strategies incorporating bio-control for oilseed rape pests are tested.
Das Projekt "Resistance in Oilseed Rape against the Cabbage Stem Weevil (Ceutorhynchus pallidactylus)" wird vom Umweltbundesamt gefördert und von Georg-August-Universität Göttingen, Department für Nutzpflanzenwissenschaften, Abteilung Agrarentomologie durchgeführt. The cabbage stem weevil (Ceutorhynchus pallidactylus (Mrsh.)) is one of the most important pest on oilseed rape in Germany. The damage is caused first by the larvae feeding in leaf petioles and main stem second by effects of pathogen fungi, e.g. Leptosphaeria maculans. The main objective of the project is finding a source of insect-resistance to utilize it for plant breeding. An assortment of rape cultivars, resynthesis and a variety of Brassica species will be tested for resistance against the weevil. For testing a far-reaching assortment a screening method will developed in laboratory. The results getting from these experiments will be compared with particulars obtained under field conditions over three years on different locations in North-western Germany.