Document Type : Original research articles
Authors
1
Agric. Zoology Dept., Faulty of Agric., Mansoura Univ., Mansoura, Egypt
2
Plant Protect. Rese. Institute, Agric. Res. Center, Dokki, Cairo, Egypt
3
Pests and Plant Protec. Dept., National Research Center, Dokki, Cairo, Egypt
Abstract
Biological aspects and life table parameters of the two-spotted spider mite Tetranychus urticae Koch was determined at five temperature degrees. Total immatures averaged 8.30, 7.50, 6.85, 5.15 and 4.50 days, while life cycle averaged 14.95, 12.95, 10.50, 7.65 and 6.30 days for female when reared at 15, 20, 25, 30 and 35°C, respectively. Life span averaged 35.40, 31.00, 20.50, 15.30 and 12.35 days at the same temperatures. The mean generation time (T) averaged 20.259, 18.345, 14.029, 10.282 and 8.775 days. The net reproductive rate (Ro) values were 22.842, 27.024, 27.846, 22.738 and 9.790 when T. urticae was kept at the same temperatures. The intrinsic rate of natural increase (rm) was 0.1543, 0.179, 0.237, 0.303 and 0.259 and the finite rate of increase (exp rm) averaged 1.166, 1.196, 1.267, 1.355 and 1.296 at 15, 20, 25, 30 and 35°C, respectively.
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