摘要：The spatial pattern of Mal de Río Cuarto del maíz (Rio Cuarto Corn Disease) was studied during three growing seasons in Córdoba Province, Argentina. The study combined ELISA determinations in experimental plots outside the endemic area during the first growing season with symptom assessments in that situation and in commercial plots in or near the endemic area during the two subsequent growing seasons. For the experimental plots studied during the first growing season, ELISA data indicated i random spatial pattern of the disease, whereas symptoms data, analyzed by ordinary runs test, showed only 13 out of 120 simples with clumped pattern. Symptom analysis during the next two seasons revealed only 3 of 23 samples with significant aggregation. No edge-to-center disease gradients were identified, suggesting that the vector does not disperse from nearby sources. Our results agree with the hypothesis of a random spatial pattern of this disease, consistent with i monocyclic nature
