Sintomatologia da murcha de Ceratocystis fimbriata em eucalipto

摘要

The symptomatology of Ceratocystis fimbriata wilt in eucalyptus was described based on observations of 4-month to 5-year-old clonal plantations, in stump sprouts, rooting cuttings, and rooted seedlings in nurseries. The disease was characterized as a model of systemic disease in woody plants, which starts in roots and progresses upward to the collar and trunk through the medullar parenchyma, where dark stripes irradiate and lead a portion of the vascular cambium, phloem and phelloderm to death. As the pathogen spread upward and radially, a longitudinal reddish-brown, continuous or non-continuous corky lesion appeared outside the trunk. Later, it turned into a furrowed, brownish, and finally longitudinal canker with callus on both sides. In infected young sprouts, cuttings, and seedlings, the lesions were longitudinal and bluish-black or purple. The xylem was inactivated by compression of the radial stripes in some woody segments.