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Latakia, Syria

Saker I.,Latakia University | Dahiah H.,Latakia University | Mofleh M.,Agricultural Research Center | Basheer A.,Damascus University
Egyptian Journal of Biological Pest Control | Year: 2015

The present study aimed to evaluate the efficacy of the predatory mite Typhlodromus athiasae Porath and Swirski (Acari: Phytoseiidae) as a biocontrol agent aginst the two spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae). The predator exhibited a type II functional response when offered T. urticae adults at six densities (5, 10, 20, 40 .60 and 80), based on the random predator equation. Estimated attack rate (a) and handling time (Th) were 0.115 h−1 and 0.1304 h. Rate of prey consumption by a predator elevated as prey density increased, but eventually levels off at a plateau at which the rate of consumption remained constant regardless to the increases in prey density. Results of this study revealed that T. athiasae could be used in biological control programs of T. urticae. However, further field studies are still needed to verify this suggestion. © 2016, Egyptian Society for Biological Control of Pests. All rights reserved. Source


Basheer A.,Damascus University | Saker I.,Latakia University | Dahiah H.,Latakia University | Mofleh M.,Agricultural Research Center Latakia
Egyptian Journal of Biological Pest Control | Year: 2014

Life table parameters and predation rate of the predatory mite, Typhlodromus (Typhlodromus) athiasae Porath and Swirski (Acari: Phytoseiidae) when fed on eggs of Tetranychus urticae (Koch) (Acari: Tetranychidae) on apple leaves were studied at 25±1ºC, 65±5% RH and 16:8 L: D photophase. Female longevity was 37.64±3.85 days and its fecundity was 1.42 eggs/ day. Eggs mortality rate was 21%. Pre-ovipositional ovipositional and post-ovipositional periods recorded 2.26±0.44, 25.36±2.69 and 10.1 ±1.47 days, respectively. Immature developmental time averaged 10.64±0.23 days. Actual mortality rate reached 66%. Sex ratio was 2.24: 1 (F: M). Life table parameters were estimated as; net reproductive rate (R0) 28.06, intrinsic rate of increase (rm) 0.31 days-1, finite rate of increase (λ) 1.36, mean generation time (T) 12.9±1.3 days and doubling time (DT) 2.23 days. An adult female of T. athiasae consumed an average of 9.55, 10.8 and 3.06 eggs per day in pre-oviposition, oviposition and post-oviposition periods, respectively. It was the most voracious during its ovipositional period (10.8±0.15eggs/ day). Therefore, this predator could be a useful biological control agent against T. urticae under the local conditions. ©, 2014 Egyptian Society for Biological Control of Pests, All right reserved. Source

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