Biometrical indices variation for Scots pine needles in Annosum root rot foci
Journal Title: Лісівництво і агролісомеліорація - Year 2015, Vol 127, Issue
Abstract
In stands created on old arable lands, an investigation of the influence of pine affection by annosum root rot (Heterobasidion annosum (Fr.) Bref) on trees assimilation apparatus has a scientific significance in terms of studying trees condition differentiation under the influence of the disease. The investigation is also destined to solve the practical tasks of early diagnosis of root rot. For early detection of trees affected by the pathogen, it is important to examine changes in assimilation apparatus at different stages of the disease. The aim of the research was to determine the effect of pine stands affection by root rot on developing of assimilation apparatus depending on the age of the stands. Changes in length and weight of 1-, 2- and 3-years needles are presented for pine stands created on old arable lands of the Left bank of Siversky Donets river and affected by annosum root rot. Differences in length and weight of the needles were found between the trees in the disease foci and in inter-focal space. The length and weight of fresh and air-dry needles of trees in an inter-focal space exceed the similar indicators of trees in die-back foci. Needles weight and length in die-back foci strongly correlate with such indicators in inter-focal space (correlation coefficient of 0.91 and 0.81, respectively). Correlation between weight and length of air-dry pine needles in die-back foci and in inter-focal space is slightly less and amounts to 0.86 and 0.69, respectively. The solids content in the needles of the trees in inter-focal space is smaller than that of trees in die-back foci, indicating the imbalance of compounds synthesis under the influence of disease. It was noted that changes of biometric indicators for needles of infected stands correspond the stages of the disease (the appearance of foci, their development and attenuation). The most significant negative impact of the disease on the trees metabolism is observed in VII age class stands.
Authors and Affiliations
А. Mihaylichenko
Keywords
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