Revista Chapingo Serie Ciencias Forestales y del Ambiente
Universidad Autónoma Chapingo
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Revista Chapingo Serie Ciencias Forestales y del Ambiente
Volume VII, issue 2, July - December 2001
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DIAGNÓSTICO FITOSANITARIO DEL OLMO CHINO (Ulmus parvifolia JACQ.) EN LA DELEGACIÓN IZTACALCO DE LA CIUDAD DE MÉXICO
PHYTOSANITARY CONDITIONS OF CHINESE ELM (Ulmus parvifolia JACQ.) AT DELEGACION IZTACALCO, MEXICO CITY

David Cibrián-Tovar; J. Sánchez-Sámano; A. Zamudio-Valencia

http://dx.doi.org/

Received: 0000-00-00

Accepted: 0000-00-00

Available online: / pages.133-138

 

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  • descriptionAbstract

    In 1997, the phytosanitary and health conditions of the Chinese elm (Ulmus parvifolia Jacq.) were evaluated in two big avenues of Delegación Iztacalco in Mexico City. The inspected trees were chosen by sampling 10 percent (559 individuals) of the total number of trees in both avenues (5590 trees). The trees were young and medium size, more than 85 % of the trees were below 11 m in high and below of 30 cm in diameter. These trees had injuries in the main stem, the majority of damages were caused by persons, and only 40.79 % of the trees had clean and healthy trunks. Associated with some of the injuries were wetwood and slimeflux, in 42.22 % of the tailored trees light or dark streaks of liquid were evident, in some of these streaks a longitudinal crack of the bark and wood release the liquid down on the bark. Many injuries also had galleries by wood borers, mainly by the cerambycid Placosternus erythropus, in 18.78 % of the trees with damages, insect galleries were present. In the crown of the inspected trees it was a generalized mortality of branches, 64.22 % of the trees had pruning scars, and park workers remove dead branches for security purposes. In the days of inspection, the 80.32 % of the trees actually had dead branches; in 78 % of these trees, the fungus Tubercularia vulgaris was present in the dead branches, this is an opportunistic species that can kill weakened branches. Color of the foliage also represent a signal of stress, only the 6.08 % of the trees had green normal color, the rest of individuals had foliage light green or green yellowish. The general health conditions of the trees were rated as moderate to poor and arboricultural measures were recommended to improve the health condition.

    Keyworks: chinese elm, Ulmus parvifolia Jacq., Delegación Iztacalco, Mexico City, Forest health, Tubercularia ulmea.
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  • starCite article

    Cibrián-Tovar, D., Sánchez-Sámano, J., &  Zamudio-Valencia, A. (2001).  PHYTOSANITARY CONDITIONS OF CHINESE ELM (Ulmus parvifolia JACQ.) AT DELEGACION IZTACALCO, MEXICO CITY. Revista Chapingo Serie Ciencias Forestales y del Ambiente, VII(2), 133-138. http://dx.doi.org/