Raimo Silvennoinen, Rauno Hämäläinen, Kaarlo Nygrén, Kim von Weissenberg. (1991). Spectroradiometric characteristics of Scots pine and intensity of moose browsing. Silva Fennica vol. 25 no. 2 article id 5443. https://doi.org/10.14214/sf.a15597

Keywords: Pinus sylvestris; Scots pine; Alces alces; aerial photography; moose; spectral analysis; reflectance; multispectral photography; browsing

Abstract | View details | Full text in PDF | Author Info

The light reflected from the crowns of Scots pine (Pinus sylvestris L.) clones was measured spectroradiometrically during and after growing season. Standard deviations of the spectra of pine clones showing differences in moose browsing intensity were compared. A new algorithm was developed for predicting the browsing intensity of moose (Alces alces).

The PDF includes an abstract in Finnish.

Silvennoinen, E-mail: rs@mm.unknown
Hämäläinen, E-mail: rh@mm.unknown
Nygrén, E-mail: kn@mm.unknown
Weissenberg, E-mail: kw@mm.unknown

article id 5415, category Article

Kim von Weissenberg. (1990). Host-parasite relationships in forest ecosystems: A review. Silva Fennica vol. 24 no. 1 article id 5415. https://doi.org/10.14214/sf.a15567

Keywords: Pinus; resistance; Ophiostoma; rust diseases; Cronartium; Cryphonectria; Melampsora; polygenic; oligogenic; gene-for-gene

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Based on a survey of world literature it is concluded that 1) the better -researched epidemic forest pathosystems are caused by anthropogenic factors, 2) the systems most likely have a polygenic background, and 3) resistance breeding should maintain polygenic resistance with restrictive incorporation of oligogenic resistance. Corresponding objectives are valid in breeding programs of presently balanced pathosystems, which may turn epidemic if man causes changes in the gene pool and alters critical environmental conditions.

The PDF includes an abstract in English.

Weissenberg, E-mail: kw@mm.unknown

Category : Article

article id 7568, category Article

Kim von Weissenberg. (1973). Indirect selection for resistance to fusiform rust in Loblolly pine. Acta Forestalia Fennica no. 134 article id 7568. https://doi.org/10.14214/aff.7568

Keywords: breeding; Pinus taeda; fusiforme rust; Loblolly pine; rust resistance; growth-inhibiting substances

Abstract | View details | Full text in PDF | Author Info

Indirect selection for resistance is superior to direct selection under certain conditions. The phenotypic correlation was studied between resistance to fusiform rust (Cronartium fusiforme) in loblolly pines (Pinus taeda L.), chosen by a newly-developed stability index, and the amount of resin acids, growth-inhibiting substances, and fatty acids extracted from pine tissue. No association was found between rust resistance and the amount of total or individual resin acids in clones or families. The amount of growth-inhibiting substances present in branches from full-sib families was greater in rust-resistant compared to rust-susceptible families. A strong association was found between resistance and the amount of long-chain fatty acids in four clones. A weak association was found between resistance and the amount of the fatty acid 18:2 in five other clones.

The PDF includes a summary in Finnish.

Weissenberg, E-mail: kw@mm.unknown

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