Browsing by Subject "sienituhot"

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  • Annila, Erkki; Heliövaara, Kari (Suomen metsätieteellinen seura, 1991)
  • Uotila, Antti (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1990)
    Two Pinus sylvestris stands in each of four research areas in different parts of Finland were pruned during the period May 1985-April 1986. Test prunings were carried out 16 times in all eight stands during the year. Every other pruned tree was inoculated with conidia of the canker fungus Phacidium coniferarum. Pruning damage surveys were also carried in 50 pine stands pruned during 1981-84. The most susceptible pruning period was from October to December. The safe pruning season ended in autumn when the five-day mean temperature decreased below 7 degrees C. The unsafe pruning season ended when the temperature remained permanently below 0 degrees C. The mycelia of the fungus were pathogenic in the inoculations made from October to March. The fungus commonly occurred in slash and in pines wounded during the autumn. P. coniferarum has a one-year life cycle. Recommendations are made for avoiding unsafe pruning times in the different regions of Finland.
  • Annila, Erkki (Suomen metsätieteellinen seura, 1989)
  • Kaitera, Juha; Jalkanen, Risto (The Finnish Society of Forest Science and The Finnish Forest Research Institute, 1994)
    Damage on Scots pine (Pinus sylvestris L.) caused by Gremmeniella abietina (Lagerb.) Morelet was assessed in the summer of 1992 in sixty-seven stands in eastern Lapland. The area and severity of damage were smaller and lighter than had earlier been estimated and occurred especially in stands in the first-thinning stage or in middle age. Significant new infection of 1991 occurred in stands previously heavily infected by G. abietina near the Kemihaara river, lake Naruska, the Naruska river, the Tuntsa river and lake Vilma. Fresh damage occurred mainly in the lower or middle parts of the Scots pine canopies.
  • Sairanen, Anne (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1990)
    Mineral soil sites where Scots pine (Pinus sylvestris) exhibited Gremmeniella abietina (scleroderris canker) attack were characterized and classified. The tree stand, ground vegetation, soil type and site topography were described for 163 sample plots in 16 stands in 1983-87; all stands were at the pole stage or young thinning stage. The sites were classified according to the Cajander forest classification system and also numerically, using TWINSPAN analysis based on the ground vegetation. The site topography of severely damaged stands was checked with colour infrared aerial photographs. The disease was most severe in depressions and frost pockets. No other significant correlations between disease severity and site factors were found. The results indicate that the main predisposing factor in the study area is an unfavourable microclimate. It is recommended that cold air drainage basins should not be regenerated with pine.