Håvard Eikemo
Forsker
Vedlegg
CVLenker
ResearchGateBiografi
Forfattere
May Bente Brurberg Simeon Rossmann Erik Lysøe Monica Skogen Håvard Eikemo Paulina Paluchowska Mirella Ludwiczewska Sylwester Sobkowiak Marta Janiszewska Zhimin Yin Jadwiga SliwkaSammendrag
Det er ikke registrert sammendrag
Sammendrag
Disease symptoms, sources of inoculum, and patterns of spore release of Mycosphaerella ribis, the cause of Mycosphaerella leaf spot, were studied over three years in an organic blackcurrant planting receiving no fungicide applications. In addition to typical foliar symptoms, also fruit lesions were observed on the cultivars included in the study. Ascospores from leaf litter on the ground were trapped from bud break in April to mid-to-late July, but 99% were released by one month before. Conidia formed in old fruit cluster stalks overwintering on the blackcurrant shrubs were present from bud break to early August, but 99% were trapped from late May to mid-July. Conidia were found in leaf litter but were never captured in the spore trap, and ascospores were observed in old fruit cluster stalks. Degree-day models (base = 0˚C) were used to estimate the proportion of mature spores. Extended periods of dry conditions slowed spore maturation in the field. Models halting degree-day accumulation after 4 or 7 days with no rain (< 0.2 mm) or leaf wetness of < 12 h per day, gave the best performance for release of conidia or ascospores, respectively, if validated by data from controlled conditions in the laboratory. Ascospore release was suppressed during night, and if rain and wetness started during night and continued the following day, very few spores were released before sunrise. The present investigation provides new information that may be used when planning sanitary measures to reduce primary inoculum and predict spore release patterns for Mycosphaerella leaf spot.
Sammendrag
Vekstsesongen 2025 ble preget av store kontraster i temperatur og nedbør. Vinteren var uvanlig varm og våt i nord, mens våren ble den nest varmeste som er registrert i Norge, med rekordtidlig vekststart i store deler av landet. Sør- og Østlandet opplevde en svært tørr vår, mens Vestlandet og Trøndelag hadde ekstremt mye nedbør. Sommeren startet med normale temperaturer, men varierte nedbørsmengder, før juli ble varm og tørr i nesten hele landet. August og september bød på nye rekorder, med ekstrem varme i nord og store regionale forskjeller i nedbør. Disse forholdene påvirket både vekststart, avlingsutvikling og høstetidspunkt for flere kulturer.
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Divisjon for bioteknologi og plantehelse
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