Evaluación de la abundancia de pulgón amarillo del sorgo (Melanaphis sacchari/sorghi) en diferentes híbridos de sorgo y su relación con la fertilización nitrogenada.

Abstract

Los sistemas productivos del Sudoeste del Chaco son frecuentemente afectados por distintos estreses y el Sorgo es una buena opción por su resistencia a la sequía. En estos ambientes, cuando se quiere alcanzar altos rendimientos, es frecuente encontrar limitaciones por nitrógeno. El objetivo de presente trabajo fue evaluar la fluctuación del pulgón amarillo del sorgo en distintos híbridos de sorgo y su relación con la fertilización nitrogenada.

The yellow sorghum aphid is an important pest that has recently appeared in sorghum crops. Control using tolerant hybrids is a fundamental pillar for the management of this pest. The productive systems of the Southwestern Chaco are frequently affected by different stresses and sorghum is a good option due to its resistance to drought. In these environments, when high yields are to be achieved, nitrogen limitations are frequently found, which is why fertilization is a common practice in the area. The objective of this work was to evaluate the fluctuation of the yellow sorghum aphid in different sorghum hybrids and its relationship to nitrogen fertilization. Under the environmental conditions in which the test was developed, the fluctuations in the populations of the yellow sorghum aphid were low, showing variation between hybrids and not with respect to the addition or not of nitrogen. The adverse environmental conditions characterized by rainfall deficit and high temperatures prevented a negative impact on yields, and no response could be found to nitrogen fertilization