Evaluación de productos alternativos para el manejo de la viruela de la hoja (Pseudopeziza medicaginis) en el cultivo de alfalfa (Medicago sativa L.)

Abstract

The objective of this research was to evaluate alternative products for the management of leaf pox (Pseidopeziza medicaginis) in alfalfa (Medicago sativa L.). This disease produces yellowing, accompanied by small chlorotic rings on the leaflet and defoliation of the plant. The products evaluated were: Oxhitane (P1) at doses of (2; 2,5; 3 g/L) and Algimar 6000 (seaweed extract) (P2) at doses of (2,5; 3,5; 4 g/L) with an application frequency of 20, 40 and 60 days after the beginning of the study in an established crop of 270 days of age. The experimental design used was in divided plots, with 2 products and 3 doses plus a control for each product. An analysis of variance (ADEVA) was carried out to determine the differences between treatments and the Tukey test at 5% was used to check the means of the treatments. Based on these analyses, it was determined that the treatment with the lowest incidence of P. medicaginis was P1D2 (Oxhitane, dose 2,5g/L) with a value of 15, 40%. In severity, the lowest value was for treatment P1D3 (Oxhitane, dose 3g/L) with an average of 6,91%. In stem height, weight and yield, there were no significant differences; in the percentage of dry matter, the best treatment was P1D2 with a value of 38,43%. In the variable quantity of chlorophyll the best treatment was P2D1 (Algimar 6000, dose 2,5g/L) with a value of 5,50 µg/g. In addition, in the analysis of treatment costs, the treatment with the highest investment was P2D3 (Algimar 6000, dose 4g/L) with a value of 0,45 USD and in benefit/cost the treatment with the highest value was the Control with 1,36 being the one with the highest benefit and the lowest cost. The treatment with the lowest benefit/cost was P1D1 (Oxhitane, dose 2 g/L)