Eur. J. Entomol. 115: 326-331, 2018 | DOI: 10.14411/eje.2018.032

Temperature-dependent functional response of Aenasius bambawalei (Hymenoptera: Encyrtidae) to different population densities of the cotton mealybug Phenacoccus solenopsis (Hemiptera: Pseudococcidae)Original article

Razieh JOODAKI1, Nooshin ZANDI-SOHANI1 *, Sara ZARGHAMI2, Fatemeh YARAHMADI1
1 Department of Plant Protection, Faculty of Agriculture, Khuzestan Agricultural Sciences and Natural Resources University, Mollasani, Iran; e-mails: r.joodaki.3@gmail.com, nzandisohani@yahoo.com, zandi@ramin.ac.ir, yarahmadi@ramin.ac.ir
2 Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University, Ahvaz, Iran; e-mail: sar.zarghami@gmail.com

The functional response of Aenasius bambawalei Hayat (Hymenoptera: Encyrtidae) to different population densities of Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) was investigated under laboratory conditions of 65 ± 5% R.H., a photoperiod of 14L : 10D and at temperatures of 25, 30 and 35 ± 1°C. Two, 4, 6, 8, 16, 32 and 64 third instar nymphs of P. solenopsis were exposed to newly emerged mated female parasitoids for 24 h. The parasitoid exhibited a type II functional response at all temperatures. The searching efficiencies (a) and handling times (Th) were 0.1818 h-1 and 5.0012 h at 25°C, 0.1382 h-1 and 3.2807 h at 30°C, and 0.2097 h-1 and 2.3635 h at 35°C, respectively. The maximum attack rates (T/Th) were 4.8, 7.3 and 10.2 nymphs at 25, 30 and 35°C, respectively. This indicates that A. bambawalei is more likely to be an effective biological control agent of P. solenopsis in warm seasons.

Keywords: Hymenoptera, Encyrtidae, Aenasius bambawalei, Hemiptera, Pseudococcidae, Phenacoccus solenopsis, attack rate, biological control, handling time, parasitoid, cotton mealybug, searching efficiency

Received: January 20, 2018; Revised: May 15, 2018; Accepted: May 15, 2018; Published online: July 9, 2018  Show citation

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JOODAKI, R., ZANDI-SOHANI, N., ZARGHAMI, S., & YARAHMADI, F. (2018). Temperature-dependent functional response of Aenasius bambawalei (Hymenoptera: Encyrtidae) to different population densities of the cotton mealybug Phenacoccus solenopsis (Hemiptera: Pseudococcidae). EJE, 115, Article 326-331. https://doi.org/10.14411/eje.2018.032
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