Effect of Zelus longipes (Hemiptera: Reduviidae) on Diaphorina citri (Hemiptera: Liviidae) and its parasitoid Tamarixia radiata (Hymenoptera: Eulophidae) under controlled conditions

Bernardo Navarrete, Daniel Carrillo, Ana Y. Reyes-Martinez, Sergio Sanchez-Peña, Jose Lopez-Arroyo, Heather McAuslane, Jorge E. Peña


Studies were conducted under controlled laboratory conditions to evaluate the effect of the predator, Zelus longipes (Hemiptera: Reduviidae) on mortality of Diaphorina citri (Hemiptera: Liviidae) as well as its effect on the specialized parasitoid, Tamarixia radiata (Hymenoptera: Eulophidae). All tested life stages of Z. longipes consumed significantly more D. citri adults than nymphs. Zelus longipes nymphs were only effective as predators of D. citri adults at a predator density of 8 individuals (or specimens) per arena. The mortality of D. citri nymphs caused by Z. longipes adult females was higher at the densities of 2 or more predators per arena. All densities of male and female adult Z. longipes resulted in mortality of nearly all the T. radiata adult parasitoids offered. The importance of intraguild predation and possible interference with T. radiata are discussed.


Se estudió bajo condiciones de laboratorio el efecto del depredador Zelus longipes (Hemiptera: Reduviidae) sobre el psílido de los cítricos Diaphorina citri (Hemiptera: Liviidae), así como su efecto sobre el parasitoide Tamarixia radiata (Hymenoptera: Eulophidae). Todos los estadios de Z. longipes consumieron una cantidad significativamente más alta de adultos que de ninfas de D. citri. Las ninfas de Z. longipes fueron efectivas solamente como depredadores de adultos de D. citri, cuando la densidad del depredador era de 8 ninfas por arena experimental. Todas las densidades de machos y hembras de Z. longipes consumieron todos los adultos del parasitoide T. radiata. Se discute la importancia de depredación intragremial.


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citrus psyllid; intraguild predation; functional response; assassin bug; Murraya

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