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Epidemiology of a citrus leafspot disease in colima mexico


Phytopathology 78(4): 440-443
Epidemiology of a citrus leafspot disease in colima mexico
A leaf-and twig-spot disease (LSD) known as "bacteriosis" is a suspected form of citrus canker (Xanthomonas campestris pv. citri) that occurs primarily on Mexican lime (ML) trees (Circus aurantifolia) along the central-Pacific coast of Mexico. Sesonal incidence and severity of presumptive LSD symptoms in two groves increased during the dry, cool months (November-May) and decreased during the warm, rainy season (June-October). Presumptive LSD symptoms were observed on all 15 citrus cultivars that were evaluated for natural infection in the field. Observed host susceptibility rankings showed. C. limettioides, C. aurantifolia, C. macrophylla, and C. latifolia to be most susceptible to LSD, and C. sinensis 'Valencia,' C. taiwanica, and C. reticulata to be least susceptible. C. sinesis 'Washington navel.' C. grandis, C. auranium, and C. paradisi were intermediate. Presumptive LSD symptoms could not be confirmed on varieties of Poncirus trifoliata. Natural symptom incidence of LSD on non-ML hosts decreased with increasing distance from ML blocks. No definitive X.c. pv. citri isolates were recovered during the course of these experiments, and epidemiological and etiological factors of LSD are unlike those of known forms of citrus canker.

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Accession: 005375853



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