Evaluación de la tolerancia del cultivo de maíz (Zea mays) al ataque del gusano cogollero (Spodoptera frugiperda) sometido a diferentes frecuencias de control químico durante la época seca en la zona de Mocache.

The fall armyworm is considered a key pest in the crop of maze and other grasses. It affects the young tissue of the plant (bud) and may even affect its cob. The damage produced by this pest affects maze production as well as the farmer's economy. The main method of controlling the fall armyworm is the use of some dangerous insecticides which affect the health of the human being and the agroecosystem, for these reasons it is necessary to search for and have alternatives that minimize their use. The following research shows one of the first attempts in which explore the tolerance of the crop of maze to the attack of an insect-pest, for this purpose, it was established tolerance levels of this plant to the attack of the fall armyworm (Spodoptera frugiperda) undergoing to different insecticide application frequencies. The research was done in the experimental farm "La María” belonged to Universidad Técnica Estatal de Quevedo. It was applied a completely randomized block design (DBCA) with 6 treatments and 4 repetitions, in which was used as planting material the hybrid maze (Somma). The treatments consisted in the application of insecticides in different frequencies (days) of application. The results obtained have showed us significant differences in the variables of plant height, cob longitude, cob diameter, number of rows, number of cobs and the presence of the fall armyworm among the treatments. Nonetheless it was detected differences in severity produced by the insect between the control treatment (application of insecticide according to the farmer) showed greater severity with 7.11% and the free-attack treatment in which no chemical control was used, besides, registered an average of 2.96% it was also possible to detect differences in yields per hectare as well as its benefit-cost . The treatment that obtained higher yields and a better benefit-cost was the treatment in which the application of insecticide was respected based on the economic injury level of 25% getting 6609.51 kg ha-1. These results confirm the importance of the use of economic thresholds during the pest management plans. The maze can tolerate the damages of the fall armyworm without reducing their yields per hectare as long as it is used in conjunction with monitoring measures based on the application of insecticides that respect economic injury level. Key words: Tolerance, monitoring fall armyworm, economic injury level

• Үндсэн зохиолч: Betancourt Guayasamin, Carlos Eduardo (author)
• Формат: bachelorThesis
• Хэл сонгох: spa
• Хэвлэсэн: 2019
• Нөхцлүүд: Monitoreo; Gusano cogollero; Umbral de daño económico
• Онлайн хандалт: http://repositorio.uteq.edu.ec/handle/43000/3265