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Causes for breeding a spruce variety resistant to Lymantria monacha. Research on spring development and chemical composition of needles on spruce trees attacked and not attacked by L. monacha



Causes for breeding a spruce variety resistant to Lymantria monacha. Research on spring development and chemical composition of needles on spruce trees attacked and not attacked by L. monacha



Forstwissenschaftl Centralbl 67(2): 110-119



Needles of severely attacked and of uninfested spruce trees during an outbreak were not distinguished either in content of ether-soluble substances (wax, turpentine, oils) or of tannic and non-tannic substances. Thus a high content of these substances does not protect spruce needles from attack by Lymantria. The breeding of a resistant form of Picea excelsa does not involve chemical composition as yet, but there may be some success by making selections of late developing spruce; most of the uninfested trees belong to forms which develop their new growth late in the spring. These are also more resistant to spring frosts.

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