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At the end of July 1997 a premature shedding of one- and two-year-old foliage of Scots pine (Pinus sylvestris L.) was observed in central Poland. We examined the etiology and physiological consequences of this needle shedding event in a 15-year-old Scots pine plantation with diverse populations originating from Sweden, Russia, Latvia, Poland, Germany and France. On average, trees lost 20% of two-year-old...
From May till October 1999, 1-year-old birch seedlings were grown in a greenhouse in a substrate (forest soil under a birch tree + perlite, 1:1), without and with added aluminium chloride (40 and 160 mg Al dm⁻³). The added aluminium chloride inhibited the growth of seedlings, especially of their roots. At the end of the experiment the substrate treated with aluminium chloride contained more Al and...
The aim of this study was to verify descriptions of the morphology of the fungus responsible for powdery mildew on oak leaves of nursery seedlings and of young trees in forest stands. Infected, fully developed leaves from apical parts of stems of Quercus robur or Q. petraea were collected in two national parks and in six forest districts in Poland. The taxonomic characteres of all specimens were generally...
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