Effect of the oviposition period and age of the females of Dalbulus maidis (Hemiptera: Cicadellidae) in the emergence of egg parasitoids
Abstract
Little is known about the effect of adult leafhopper age and its oviposition period on the emergence of egg parasitoids. The objective of this study was to determine the emergence rate of egg parasitoids that attack eggs of the corn leafhopper, Dalbulus maidis (DeLong) (Hemiptera: Cicadellidae), when the adult corn leafhopper differs in age and is subject to different lengths of time for the oviposition process. A total of 4 treatments compared adult females of D. maidis of 2 different ages, young (2-wk-old) and mature (8-wk-old), as well as 2 periods of oviposition of different lengths (3 and 6 d). The adult parasitoids emerging from the eggs of D. maidis were Anagrus virlai Triapitsyn and Anagrus columbi Perkins (both Hymenoptera: Mymaridae). When analyzing the interactions of leafhopper age at oviposition, it was found that the age of the leafhopper females (2-wk-old vs 8-wkold) had a different effect on the number of oviposited eggs for the 2 oviposition periods. On the other hand, in the emergence of parasitoids, there were no significant differences between age and oviposition period, but the emergence of parasitoids was related to the number of eggs oviposited by D. maidis.
Resumen
Se conoce poco sobre el efecto de la edad de la chicharrita adulta y el período de oviposición por la chicharrita en la emergencia de parasitoides de huevo. El objetivo del presente estudio fue determinar la tasa de emergencia en los parasitoides de huevos que atacan a la chicharrita del maíz Dalbulus maidis (DeLong) (Hemiptera: Cicadellidae) cuando la chicharrita adulta difiere en edad y está sujeta a diferente longitud de tiempo durante el proceso de oviposición. Se realizaron un total de 4 tratamientos, en donde se compararon hembras de D. maidis de 2 edades diferentes, jóvenes (2 semanas de edad) y maduras (8 semanas de edad), así como dos períodos de oviposición con diferente longitud de tiempo (3 y 6 d). Los parasitoides adultos que emergieron de los huevos de D. maidis fueron Anagrus virlai Triapitsyn y Anagrus columbi Perkins (Hymenoptera: Mymaridae). Al analizar la interacción entre los cuatro tratamientos, se encontró que la edad de las hembras (2 semanas de edad contra 8 semanas de edad) tiene un efecto diferente sobre el número de huevos ovipositados para cada uno de los 2 períodos de oviposición. Por otro lado, en la emergencia de parasitoides, no hubo diferencias entre la relación edad de la chicharrita y periodo de oviposición, pero la emergencia de parasitoides esta relacionada con el numero de huevos ovipositados por D. maidis.
Key Words: corn leafhopper; parasitism; Hymenoptera
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