Sclerotinia borealis -sienen merkitys nurmiheinien talvehtimisen heikentäjänä Helsingin yliopiston koetilalla Inarin Muddusniemessä vuosina 1950-65 I. Sääolosuhteiden vaikutus S. borealisen esiintymiseen sekä heinälajin ja -lajikkeen vaikutus nurmen talvehtimiseen

Authors

• Oiva Nissinen Hankkijan kasvinjalostuslaitos, Tammisto
• Arvi Salonen Helsingin yliopiston kasvipatologian laitos

DOI: https://doi.org/10.23986/afsci.71816

Abstract

The study was done to elucidate the incidence of Sclerotinia borealis Bub. & Vleug. and its effect on the wintering of different grasses at the Muddusniemi Experimental Farm at Inari (69°04' N, 27°06' E) in 1950—65. S. borealis was the main cause of winter damage to the grasses. Late sowings and poor growth due to unfavourable weather conditions suffered the worst damage. Cold autumns, long winters and slow thaws aggravated injuries caused by S. borealis. Warm and rainy autumns, warm springs and early thaws decreased the incidence of the fungus. Meadow foxtail, meadow fescue and meadow grass wintered best of all; brome grass was also fairly resistant. English ryegrass and cocksfoot suffered the worst damage. Finnish varieties of grass wintered better than foreign grasses. Timothy recovered from injury better than other species and had the best yields on the average. Meadow foxtail and brome grass were also very long-lived and high-yielding. Thanks to good wintering, meadow fescue yielded better than timothy in first-year leys but in the second and third years it was inferior to timothy. The heaviest winter damage occurred on the first-year leys. Differences in wintering between grasses were evened out in the older stands. Summary p. 113—114.