Abstract
Scots pine blister rust and red ring rot are common on Scots pine throughout its entire range. Specialists do not explain a significant variation in the prevalence of the diseases uniquely since it depends on complex ecological and silvicultural factors. The aim of this research is to study the influence of forest growth conditions on the incidence of Scots pine blister rust and red ring rot in pine stands of the Priangarye (territory located along the lower reaches of the Angara within the Krasnoyarsk Krai). The research methods included a detailed forest pathological examination of prevailing pine forest types, specific symptom-based macroscopic diagnosis of the diseases, data analysis using parametric and non-parametric statistical tests. Forest growth conditions indicators included type of forest, habitat conditions, and bonitet class of forest stands. The incidence of Scots pine blister rust and red ring rot in pine forests of the Priangarye reaches the extent of moderate and severe damage, respectively. The prevalence of Scots pine blister rust is significantly higher in low-bonitet lichen pine forests; the incidence rate increases along the gradient of decreasing fertility and soil moisture level. The incidence of red ring rot is significantly higher in herb-rich pine forests, in gradations of maximum soil fertility and medium soil moisture. The revealed patterns are explained by the bioecological characteristic features of pathogens (for red ring rot—additionally by factors of structural immunity in pine trees). The results of the research should be recognized in the organization of forestry practice.
Highlights
Scots pine (Pinus sylvestris L.) is adapted to a wide variety of soils and climatic parameters and is one of the world’s most widely distributed conifer species
Distribution and development, which explains a significant variation in the prevalence of Scots pine blister rust and red ring rot in pine forests of particular regions [16,37,38,39,40]
Scots pine blister rust [22,39] and red ring rot [42] in pine forests growing in dry conditions
Summary
Scots pine (Pinus sylvestris L.) is adapted to a wide variety of soils and climatic parameters and is one of the world’s most widely distributed conifer species. It occupies a range from the arid mountain regions of Spain and Turkey to the subarctic forests of Northern Scandinavia and Siberia [1]. Priangarye pine stands are the most well-known pine forests in Siberia. Long-term forestry exploitation and other anthropogenic impacts on the Priangarye forests led to the transformation of pine stands [2,3,4] but did not change the tendency towards the prevalence of Scots pine in this part of the Central Siberian region [5]. Mature and overmature pine forests take 60% of all pine stands in the region [5]
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