A trial to detect optimal pin-pricking timing in evaluating the ability to form traumatic resin canals of <Emphasis Type="Italic">Cryptomeria japonica</Emphasis> for selecting resistant trees to <Emphasis Type="Italic">Semanotus japonicus</Emphasis> (Coleoptera: Cerambycidae) |
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Authors: | Kazutaka Kato |
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Institution: | (1) Forest Tree Breeding Center, Forestry and Forest Products Research Institute, 3809-1 Ishi, Juo, Hitachi, Ibaraki 319-1301, Japan |
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Abstract: | A trial to detect optimal pin-pricking timing in evaluating the ability to form traumatic resin canals (TRCs) of Cryptomeria japonica was examined to select resistant trees to Semanotus japonicus using 14 clones in 2001 and 2002. Resistance to S. japonicus and the ability to form TRCs in the phloem was evaluated by inoculating newly hatched larvae in the bark and by a pin prick,
which was conducted every 10 days (four times) on the trunk around the larval phloem-feeding period, respectively. The larval
survivorship varied greatly among clones for both years. The mean appearance of newly formed TRCs was generally higher in
late treatment for both years, and the tangential width of them was also higher in 2001, whereas those of pre-formed TRCs
were not higher for either year. The larval survivorship did not show significant correlations with the appearance and the
width of pre-formed TRCs on all treatments. However, it showed significant negative correlations with the appearance of newly
formed TRCs on the second and third treatments on the 2-year-old layer, although this was not significant with the width of
them. This suggests that resistant clones might have the mechanism of rapidly forming TRCs when just at the stage of newly
hatched larval entering the phloem. Thus, although the relationship between the appearance and the width of newly formed TRCs
is not clear, pin-pricking treatment when the newly hatched larvae just enter the bark may be one of optimal times for the
evaluation of the resistance of C. japonica to S. japonicus.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Cryptomeria japonica Resistance Semanotus japonicus Survivorship Traumatic resin canals |
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