Revista Chapingo Serie Ciencias Forestales y del Ambiente
Universidad Autónoma Chapingo
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Volume VI, issue 1, - 2000
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ETIOLOGÍA Y SÍNDROME DEL CANCRO Cytospora EN ESTACAS DE ÁLAMO (Populus deltoids Bartr. ex. Marsh.) Y SAUCE (Salix babylonica L.)
ETHIOLOGY AND SYNDROM OF THE Cytospora CANKER ON EASTERN COTTONWOOD (Populus deltoids Bartr. ex. Marsh.) AND WEEPING WILLO (Salix babylonica L.) CUTTINGS

V. Rocha-González; David Cibrián-Tovar

http://dx.doi.org/

Received: 0000-00-00

Accepted: 0000-00-00

Available online: / pages.35-39

 

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  • descriptionAbstract

    Under greenhouse and laboratory conditions, the symptoms of the canker caused by the fungus Cytospora were studied. The hosts Populus deltoids and Salix babylonica were used. Both rooted cuttings and small pieces of branches (rods) of both hosts were inoculated with fungi obtained from cultures. Under greenhouse conditions, the rooted cuttings showed the following symptoms and signs. On Day 7, an ellipsoidal lesion was evident; the bark was sunken, wrinkly, soft and watery, and the color changed from green to dark brown. Fourteen days later, black pycnidia measuring between 0.5 and 1.5 mm in diameter appeared on the bark. On Day 21, conidia exuded from pycnidia, and long, slender orange threads formed by the conidia protruded. The conidia were hyaline, 1-celled and allantoid, 1 to 1.5 ìm wide and 3.5 to 5 ìm long. Small rods kept in the laboratory (temperature 28±1 °C in complete darkness) showed symptoms and signs very similar to those observed in the rooted cuttings; only small variations were detected in the time it took for signs of the disease to appear. Pycnidia and conidia threndhills were evident 10 and 14 days after inoculation, respectively. The fungus Cytospora chrysosperma Pers. ex. Fr. (sexual state Valsa sordida Nit.) was identified as the causal agent of the disease.

    Keyworks: Disease, Cytospora chrysosperma, symptoms, Valsa sordida, weeping willow, eastern cottonwood.
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  • starCite article

    Rocha-González, V., &  Cibrián-Tovar, D. (2000).  ETHIOLOGY AND SYNDROM OF THE Cytospora CANKER ON EASTERN COTTONWOOD (Populus deltoids Bartr. ex. Marsh.) AND WEEPING WILLO (Salix babylonica L.) CUTTINGS. , VI(1), 35-39. http://dx.doi.org/