Analysis of Disease Progress of Citrus Canker in Nurseries in Argentina

Xanthomonas

“…Slopes of Gompit (y) versus IOglO (m) linearlized disease gradients ranged from -0.21 to -4.13, but discrete foci of inoculum were not determined in the blocks of trees studied (Danos et al, 1984). The higher rates of increase in nurseries compared to the orchards reflected more conducive environmental conditions present during the tests and the faster rate of increase than can be achieved in plants in very dense nursery-planting patterns versus the greater spacings of orchards (Gottwald et al, 1989b). citri from discrete inoculum sources and early phases of canker epidemics in concentric circles of trees planted around an inoculated focal tree at 5 m increments were best described by the Gompertz model.…”

“…Based on upwind and downwind disease gradients in citrus orchard plots in Argentina a northeast preference of pathogen spread was related to the blowing rainstorms from the southwest (Gottwald et al, 1988b(Gottwald et al, , 1989b. Based on upwind and downwind disease gradients in citrus orchard plots in Argentina a northeast preference of pathogen spread was related to the blowing rainstorms from the southwest (Gottwald et al, 1988b(Gottwald et al, , 1989b.…”

“…Rates (k) of disease increase were calculated from linearized Gompertz transformed data from orchards to be 0.04-0.06,0.1,0.18 and 0.13-0.24 per day for mandarin, satsuma, navel and sweet orange trees, respectively. Citrus canker epidemics in nurseries and newly established orchards, where initial inoculum consisted of a single inoculated tree surrounded by nursery or orchard trees, were most appropriately described by the Gompertz model when exponential, monomolecular, logistic, Gompertz and Weibull models were fitted to disease progress data by non-linear regression analysis (Gottwald et al, 1989b). Spread of X. c. pv.…”

Leaf Surface Colonization of Sugarcane byXanthomonas albilineansand Subsequent Disease Progress Vary According to the Host Cultivar

“…is known to occur after short-distance dissemination of bacteria via water splashing or canopy fauna (15,17,20,23), or due to long-distance dissemination via tropical storms and hurricanes (8,11,16,23). Similar to other xanthomonads (6,22,30), epiphytic survival of X. albilineans is expected to be promoted by high relative humidity, rainfall, and mild to warm temperatures that occur in lowland areas of tropical countries.…”

La necrosis bacteriana de la vid, causada por xylophilus ampelinus. Detección serológica, distribución en Aragón y sensibilidad varietal.

“…Se han efectuado análisis espaciales para algunas bacterias como Xanthomonas citri y greening (Gottwald et al, 1988;Gottwald et al, 1989;Gottwald et al, 1991). Sin embargo, no se han realizado estudios encaminados a conocer la distribución espacial de la necrosis bacteriana de la vid; por ello, se ha creído conveniente realizar algún tipo de análisis que permita obtener conclusiones sobre la posible existencia de algún gradiente relacionado con operaciones culturales, orientación, etc.…”