Presence of Heterobasidion annosum and the need for stump treatment in monocultures of Scots pine in southern Sweden
The incidence of Heterobasidion spp. in the roots of Scots pine (Pinus sylvestris L.) was investigated in fifteen monocultures of Scots pine in southern Sweden. On the basis of crown condition, all trees were divided into four classes from healthy to dead trees on a number of sample plots at each...
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| Formato: | L3 |
| Lenguaje: | Inglés sueco |
| Publicado: |
SLU/Southern Swedish Forest Research Centre
2004
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| Materias: |
| Sumario: | The incidence of Heterobasidion spp. in the roots of Scots pine (Pinus sylvestris L.)
was investigated in fifteen monocultures of Scots pine in southern Sweden. On the
basis of crown condition, all trees were divided into four classes from healthy to dead
trees on a number of sample plots at each site. The root systems were excavated and
sample discs were taken from two healthy looking trees and two defoliated trees in
each stand. All samples were analysed for the presence of Heterobasidion spp. The
data was used to create a probability model for trees getting infected. Estimated
volume losses were then compared to the costs for treating stumps.
Heterobasidion spp. was found in root samples from pines at fourteen of the fifteen
stands. A total of 44 of the 60 sampled trees were infected by Heterobasidion spp. in
the root systems. Of the infected pines 20 trees were assessed as healthy looking and
24 as defoliated trees. Previous land use, thinning season and crown condition class
had significant effects on the percentage of root discs infected by Heterobasidion spp.
Accordingly, highest probability of finding an infected tree was among the defoliated
trees in stands on former agricultural land with thinnings carried out during season of
spore spread.
The results show that at three percent interest rate stump treatment to prevent spore
infection of Heterobasidion spp. in monocultures of Scots pine in southern Sweden is
clearly beneficial, especially in stands established on former arable land. |
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