Evaluación de dos elicitores sintéticos y dos microorganismos para el manejo integrado de punta morada de la papa, variedad superchola

Abstract

The aim of this research was to evaluate the use of two synthetic elicitors and two microorganisms for the integrated management of the purple top of potato, superchola variety. The research was carried out in the Rumipamba neighborhood of the University, Salcedo canton, Cotopaxi province. A completely randomized block design with three replications was implemented. The treatments under study were (Bacillus subtilis, Trichoderma harzianum, salicylic acid, potassium phosphite and control), which were applied at a dose of 5 cc/L from the first manifestation of the disease. The variables analyzed were: number of stems per square meter at 45 days, plant height and vigor at 60, 80 and 100 days in 20 plants per experimental unit, percentage of disease incidence at 55, 70, 85, 100, 115 and 130 days in 20 plants per experimental unit, disease severity at 65, 80, 95, 110, 125 and 140 days in 20 plants per experimental unit, population dynamics of Bactericera cokerelli at 65, 80, 95, 110, 125 and 140 days in 3 plants per experimental unit, yield and economic analysis. The results obtained in this research showed that the potassium phosphite treatment presented the best results, obtaining a number of stems per square meter (38.00), vigor (7.33), height (74.08 cm), disease incidence 100%, disease severity (4.56), population dynamics of Bactericera cokerelli, eggs (8.66), nymphs (2.66) and adults (0.00), and yield (236.82 kg/ha). The economic analysis reflected a negative TAMAR in all the treatments under study, but, in comparison with the other treatments, the potassium phosphite-based treatment presented -99.01%, because the yield obtained in this research was excessively low, this due to the severity of the disease that was present in 100% of the crop. We can conclude that this disease is becoming one of the most devastating of the potato crop in this area. It is recommended to carry out trials in this area using potassium phosphites with different doses as an activator of resistance to this disease.