Comparación de estadios larvales de Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) mediante longitud de cápsula cefálica y distancia entre setas frontales
Comparación de estadios larvales de Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) mediante longitud de cápsula cefálica y distancia entre setas frontales
Authors
Authors
Date
2015-07-26
Datos de publicación:
10.4067/S0718-34292011000300012
Keywords
Cápsulas cefálicas - Setas cefálicas - Gusano del maíz - Helicoverpa zea - Maíz
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Abstract
El gusano del maíz Helicoverpa zea es de una importancia agrícola relevante debido al daño que provoca en los cultivos de maíz y afines, situación que está en directa relación con determinados estadios de su ciclo larval. Fueron colectadas larvas en tres regiones de Chile; norte en Arica, centro en San Clemente y en el sur correspondiendo a Angol, para determinar las diferencias en los estadios larvales por medio del ancho de la cápsula cefálica y la distancia entre setas frontales. Los resultados acusaron diferencias estadísticas significativas entre las larvas colectadas de las regiones de Chile y determinaron que la distancia de las setas cefálicas es una variable mas precisa en la diferenciación de los estadios larvales en relación al ancho de cápsula cefálica.
The corn earworm Heliothis zea has relevant agricultural importance because of the damage it causes in corn and other farms, in direct relation to determined larval instars; effective control will be related to the knowledge of the larval biology. Larvae from northern, central and southern Chile were obtained to establish comparisons for the definition of a specific instar measuring width of cephalic capsule and distance between frontal setae (DFS); these structures present a progressive increase in length proportional to the specific instar. The results indicated significant differences among latitudes and that DFS is a better specific instar predictor than the width of the head capsule. The environmental variables that could be implied in the conditioning of lengths by latitudes are discussed as a projection.
The corn earworm Heliothis zea has relevant agricultural importance because of the damage it causes in corn and other farms, in direct relation to determined larval instars; effective control will be related to the knowledge of the larval biology. Larvae from northern, central and southern Chile were obtained to establish comparisons for the definition of a specific instar measuring width of cephalic capsule and distance between frontal setae (DFS); these structures present a progressive increase in length proportional to the specific instar. The results indicated significant differences among latitudes and that DFS is a better specific instar predictor than the width of the head capsule. The environmental variables that could be implied in the conditioning of lengths by latitudes are discussed as a projection.