Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2001
Forfattere
Sverre Kobro H. SolheimSammendrag
H. carpathicus er beskrevet som svært sjelden, men er funnet i fem fylker i syd Norge. Arten kan forekomme i stort antall i barken av døde bjørker, hvor den trolig lever av Melanomma subdispersum
Forfattere
Sverre Kobro Trond RafossSammendrag
Characteristics of 46 setae of the second stage larvae of four Hoplothrips species (Thysanoptera) are discussed with respect to their diagnostic value. Two different approaches, of which one is mathematical, for identifications of the larvae are given.
Forfattere
Sverre KobroSammendrag
H. polysticti is a common fungivorous thrips on dead Picea abies. The occurrence varied with the age of the forest and probably because of variation in the nutrient value of the fungi.
Sammendrag
Biodiversity studies of insect pathogenic fungi are normally conducted by the use of Galleria mellonella (Lepidoptera) or Tenebrio molitor (Coleoptera) as bait insects. These insects are easy to obtain and handle and large numbers of fungal isolates are often obtained by the use of these standard bait insects, but they usually yield only a limited number of fungal species. It was therefore an aim to compare the standard bait insect G. mellonella with Delia floralis (Diptera), a soil dwelling pest of Brassica vegetables, as bait insect. A method for baiting soil samples with D. floralis larvae was developed, and a systematic survey was conducted on soils from northern Norway for insect pathogenic fungi. Fungal species identified in the study were Beauveria bassiana, Fusarium merismoides, Metarhizium anisopliae and Tolypocladium cylindrosporum. T. cylindrosporum was found more frequently when using D. floralis as the bait insect than when using G. mellonella. Comparisons between the occurrences of insect pathogenic fungi in organically versus conventionally farmed soil have so far only been undertaken on a minor scale. This study therefore also aimed to compare the abundance of insect pathogenic fungi in organically and conventionally farmed soil and in soil from arable fields and the adjacent semi-natural field margins. The study showed a significantly higher occurrence of insect pathogenic fungi in soils from arable fields of organically managed farms. No significant differences in the occurrence of insect pathogenic fungi were, however, found between the field margins of the two cropping systems.
Sammendrag
Brassiceye® traps baited with ethylisothiocyanate were modified and used to collect adults of Delia radicum and D. floralis from the field to observe the infection level of Entomophthora muscae and Strongwellsea castrans. This study confirms that both E. muscae and S. castrans contain the basic properties to establish epidemics and act as important mortality factors in the field. Our results also suggest that E. muscae dominates under warm conditions and that S. castrans might be more dominating under cold conditions. The study also indicates that modified Brassiceye® traps are effective and very selective for D. radicum and D. floralis. Advantages and disadvantages of using different capture methods for fly population monitoring, pathogen sampling, and autodissemination are presented.
Forfattere
Ingeborg KlingenSammendrag
Ny forskning viser at skadedyr som kålfluer kan bekjempes ved hjelp av naturens egne metoder: enkelte sopparter kan på en "utspekulert" måte drepe fluene - samt spre smitten videre.
Sammendrag
For å nå styresmaktene sitt mål om at 10 % av arealet skal vere dyrka økologisk innan 2010 må ein innan økologisk fruktdyrking særleg løyse flaskehalasr knytt til økologisk plantevern. Gjennom prosjektet har ein i hovudsak arbeidd med både førebyggjande og direkte tiltak mot viktige skadedyr, sopp og ugras knytt til fruktproduksjonen.
Forfattere
Gunnhild Jåstad Sverre KobroSammendrag
Rognebærmøll er eit alvorleg skadedyr i norsk epledyrking. Møllet har rogn som vertsplante for egglegging, men då rogn er vekselberande legg dei egga sine på eple i år når det ikkje er nok eggleggingsstader på rogn. I prosjektet har ein funne dei luktsoff som rognebærmøllhoene reagerar på i rogn og eple. Ein har vidare funne at rognebærmøllet legg egg frå 23:30 til om lag 02:30 på natta. Tanken er å utvikle feller med luktstoff som er meir attraktive enn eple for eggleggingsklare hoer, og på den måten førebyggje skade i eple.
Forfattere
A-C. Bakman M. Bengtsson Gunnhild Jåstad Sverre Kobro P. WitzgallSammendrag
Coupled gas chromatography-electroantennography was used to analyse the antennal response of female moths to volatiles collected from apple and rowan.
Forfattere
Ricardo Holgado Bonsak Hammeraas G. KarssenSammendrag
Service in Wageningen, The Netherlands. The smooth elongated galls, included several males, swollen adult females with protruding small egg masses and hatching second-stage juveniles. Males and second-stage juveniles also were isolated from adhering soil. The root-knot nematode was identified as Meloidogyne ardenensis Santos. Identification was based on female, male and second-stage juvenile morphology and female isozyme electrophoresis with malate dehydrogenase and esterase. Meloidogyne ardenensis is parasitizing on several dicotyledonous hosts, mostly herbaceous and woody plants and distributed throughout Europe with Scotland as the most northern report so far. To our knowledge this is not only the first published report of Meloidogyne ardenensis in Scandinavia, but also the first report of this species on lady"s mantle.