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.
2008
Forfattere
Bent J. Nielsen Jens Grønbech Hansen Hans Pinnschmidt Lars Bødker Ragnhild Nærstad Vinh Hong Le Arne Hermansen Asko HannukalaSammendrag
Influence of weather conditions on sporangia production, release and infection of P. infestans was investigated in Denmark, Norway and Finland using Burkard spore traps and trap plants exposed in field plots. Results from field trials show that P. infestans normally forms its sporangia during humid periods at night and that they are released by a drop in the humidity in the morning. The infection can occur in the morning if there are dew drops remaining on the canopy while sporangia are being released. Sporangia released into the air can only infect if they make contact with free water from either dew or precipitation within very few hours. The studies also showed that the newly formed sporangia can remain in the lesions during overcast weather conditions and be dispersed over at least 2-3 days. By coupling the sporangia formation with a model of sporangia survival as affected by global radiation, a better correlation was achieved between infection on trap plants and dispersed sporangia than if only the index of sporangia formation was used as a predictor. The involvement of the survival model will reduce the number of false warnings, and thus reduce fungicide consumption.
Forfattere
Bent J. Nielsen Jens Grønbech Hansen Hans Pinnschmidt Lars Bødker Ragnhild Nærstad Vinh Hong Le Arne Hermansen Asko HannukalaSammendrag
Influence of weather conditions on sporangia production, release and infection of P. infestans was investigated in Denmark, Norway and Finland using Burkard spore traps and trap plants exposed in field plots. Results from field trials show that P. infestans normally forms its sporangia during humid periods at night and that they are released by a drop in the humidity in the morning. The infection can occur in the morning if there are dew drops remaining on the canopy while sporangia are being released. Sporangia released into the air can only infect if they make contact with free water from either dew or precipitation within very few hours. The studies also showed that the newly formed sporangia can remain in the lesions during overcast weather conditions and be dispersed over at least 2-3 days. By coupling the sporangia formation with a model of sporangia survival as affected by global radiation, a better correlation was achieved between infection on trap plants and dispersed sporangia than if only the index of sporangia formation was used as a predictor. The involvement of the survival model will reduce the number of false warnings, and thus reduce fungicide consumption.
Forfattere
Sølvi SvendsenSammendrag
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Sølvi Svendsen Siv Fagertun RembergSammendrag
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Forfattere
Sølvi SvendsenSammendrag
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