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
Sammendrag
Phytophthora infestans is an important pathogen on potato and tomato during the winter seasons in the north of Vietnam and all the year around in Lam Dong province in the south of Vietnam. Data from earlier studies of isolates of P. infestans collected in 2002-2003 showed that the P. infestans population on tomato and potato from Vietnam still consist of the "old" population. However preliminary studies of P. infestans samples from 2007 indicate that this situation has started to change. Data from aggressiveness tests of P. infestans isolates on tomato and potato showed that the majority of isolates collected from tomato could not infect potato. All tested isolates originating from potato infected both hosts. From 2005-2007, field experiments in tomato and potato using IPM strategies for controlling late blight have been carried out in Lam Dong province and in Hanoi area (north of Vietnam). In these experiments, cultivars with different levels of late blight resistance and different fungicide dosages have been tested. Simple forecasting methods and sanitation procedures were also included in some of the experiments. In Lam Dong, strategies including 7 days fixed spray intervals with full dose of the fungicide mancozeb did not control late blight properly in tomato, and all 4 tomato experiments were terminated early. In the potato experiments use of a more modern fungicide could control late blight using reduced dosages. In the tomato experiments in the north no natural infection of late blight occurred during the experimental period.
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
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Sølvi Svendsen Siv Fagertun RembergSammendrag
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