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13 March 2017 Effect of temperature on life table parameters of Phytoseius plumifer (Phytoseiidae) fed on Eotetranychus hirsti (Tetranychidae)
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Abstract

Eotetranychus hirsti Pritchard & Baker (Tetranychidae) is one of the important pests of fig trees that is widely distributed in fig orchards of Iran. The predatory mite Phytoseius plumifer Canestrini & Fanzago is a phytoseiid mite on fig that can feed and reproduce on E. hirsti. The effect of four constant temperatures (20, 25, 30 and 35°C) on demographic parameters of P. plumifer fed on nymphal stages of E. hirsti was determined under laboratory conditions at 50 ± 5% RH and a photoperiod of 16:8 h (L: D). The total developmental time of immature stages of this predator decreased with increasing temperature from 20°C to 35°C, and varied from 17.13±0.23 to 6.55±0.19 days for females. The lower temperature threshold (Tmin) and thermal constant (K) for the total immature stages of this predator was estimated 10.33°C and 166.67 degree-days by the ordinary linear model, 11.17°C and 147.87 degree-days by the Ikemoto linear model, respectively. Female longevity was 67.79, 47.00, 35.11, and 27.42 days at 20, 25, 30 and 35°C, respectively. The highest values of total fecundity and daily fecundity were obtained at 25°C (35.71±1.73 eggs) and 30°C (1.57±0.02 eggs), respectively. The value of the intrinsic rate of increase (rm) increased as increasing temperature from 20°C (0.064±0.0012 day-1) to 30°C (0.180±0.0023 day-1), and then decreased at 35°C (0.153±0.0037 day-1). The highest and lowest values of the mean generation time (T) were 32.75±0.95 and 14.18±0.51 days, which were obtained at 20°C and 35°C, respectively. The results of this study revealed that of P. plumifer is effective predator of the fig spider mite and develops effectively at a broad range of temperatures.

© Systematic & Applied Acarology Society
Jahanshir Shakarami and Fereshteh Bazgir "Effect of temperature on life table parameters of Phytoseius plumifer (Phytoseiidae) fed on Eotetranychus hirsti (Tetranychidae)," Systematic and Applied Acarology 22(3), (13 March 2017). https://doi.org/10.11158/saa.22.3.7
Received: 22 July 2016; Accepted: 1 February 2017; Published: 13 March 2017
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