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The fungus Pyricularia grisea causes a disease in buffelgrass known as leaf blight and induces serious damage to the plant that affects forage production, nutritional quality, and seed production and quality. The study was carried out during the summer of 2019 in three cattle ranches in Carbó, Sonora with the objective of evaluating the intensity of Pyricularia grisea damage in buffelgrass pastures and its economic impact on the quality of the seed and the consequent seeding costs associated with pathogen damage. Variables evaluated in the study were: degree of leaf blight damage, seed viability, germination, purity, percentage of live pure seed, kilograms of commercial seed required for sowing, and cost of seed affected by various intensities of blast damage. The number of plants affected and not affected by the fungus was determined in four 20 x 20 meters plots in each ranch. In each plot, the degree of damage to all the plants was quantified and categorized using four damage intensities as treatments: (1) No damage, (2) Light damage, (3) Moderate damage, and (4) Heavy damage. The experimental design used was completely randomized with 4 treatments and four repetitions in each ranch. All variables evaluated were analyzed separately and subjected to a simple variance analysis, using Duncan's multiple range test for the comparison of means (P |
