Dependencies of larch (Larix sibirica Ledeb.) growth and reproductive organ formation on its infestation by a phyllophagous miner, larch casebearer (Coleophora sibiricella Flkv., Lepidoptera, Coleophoridae) were studied. The work was performed in the sustained outbreak of the larch casebearer in the forest-steppe-larch forest at Kuznetsk Alatau. For the representative tree groups, we determined shoot linear growth, the number of axillary buds, trunk radial growth, the number of micro- and macrostrobili produced, and the contents of water, monoses, starch, and nitrogenous compounds in needles as dependent on the infestation density. We found that infestation exceeding 0.5 larvae per brachyblast significantly suppressed tree growth and reproductive organ formation. At this threshold value of infestation, a significant inhibition of shoot linear growth can serve a marker for suppressed trunk radial growth and reproductive organ formation. The lower degree of infestation did not suppress larch growth and even stimulated it. This observation, along with our data on the changes in the composition of nitrogenous and carbohydrate compounds in damaged needles, demonstrates the active character of interaction between the host tree and the phyllophagous insect, a transit of the source function from damaged needles to healthy ones, and the stimulated reparation of the assimilation apparatus.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 17, 2004
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