AHA is a Swedish abbreviation of "reveal threatened park and avenue trees" and is a method to assess the conservation value of individual trees, mainly in the park environments but also in natural stands. This method has previously only been practiced in southern Sweden (Sörensson 2008). To see if this method could provide satisfactory results in northern Sweden, I have studied it in areas around the Umeå River. This was done by studying the relationship between trees with different classifications of conservation value (as classed by the AHA method) and their content of species (species richness and abundance). Insects were collected using trunk window traps in a period of 13 weeks during the summer of 2014.

Perenner är vanliga prydnadsväxter i våra hemträdgårdar. Vi odlar dem för deras blommor och/eller bladverks skull och skadegörare som minskar prydnadsvärdet är därför inte uppskattade. Fluglarver som minerar bladen är en av flera sådana skadegörare som dock inte är särskilt uppmärksammade inom växtskyddsområdet, bara ett fåtal arter beskrivs inomsvensk litteratur.Denna litteraturstudie beskriver ett urval av 10 minerande flugarter förekommande i Sverige med värdväxt, utbredning i Sverige och Norra Europa, biologi samt skadebild. De flesta arter är ganska monofaga och angriper ett fåtal släkten, medan vissa är väldigt polyfaga med brett värdväxtregister. Runt 100 perennsläkten som är vanligt förekommande i Sverige är registrerade som värdväxter för minerarflugor och drygt 100 arter av minerande flugarter på dessa perennsläkten finns i landet.

Game fields are one way to divert animals away from sensitive areas, create shelter and forage, and also to increase the biological diversity. In this study I investigated how the plant composition in six different crop mixes used for game fields affected the biomass production, biomass consumption and biological diversity at the Koberg estate in southwestern Sweden. Six experimental fields were used and each field contained six plots, approximately 1500 m2 each, that was sown with a different crop mix. The crop mixes ranged from a pure grass mix (A), 70 % grass and 30 % leguminous plants (B), 53 % grass, 21 % leguminous plants and 26 % other herbs (C), 100 % leguminous plants (D) to the most complex mixes constituting of 91 % leguminous plants and 9 % other herbs (E) and 87 % leguminous plants and 13 % other herbs (F). The fields were cut weekly during the summer in 2010, to estimate weekly biomass production.

Delia flies (Diptera: Anthomyiidae) are economically important pests in several horticultural crops. The control is commonly relying on chemical insecticides, though there are possibilities with biological control from the natural enemies in the field. An important natural enemy is the parasitic wasp, Trybliographa rapae Westwood (Hymenoptera: Figitidae) that lays eggs in the Delia fly larvae. The parasitoid larva and the host larva have a parallel development until the host dies within its puparium and an adult parasitoid emerges. The aim of this thesis was to understand the attraction to host- and food-associated plant volatiles of T. rapae, in order to enhance the effectiveness of the parasitic wasp as a biological control agent.