Influence of temperature and host plant on the developmental time and fecundity of two-spotted spider mites in laboratory conditions


Abstract: Environmental variables, such as temperature, play a key role in the time required for development of Tetranychus urticae Koch. Developmental time and fecundity of T. urticae were examined at 15, 20, 25, 30 and 35 °C on cucumber, soybean and bean plants. Developmental time of T. urticae was the least at 35 °C (5.36 d) and 30 °C (6.01 d), while at 15 °C it took 15.28 d. As to the host plants involved, T. urticae developed the fastest on beans (8.38 d), followed by cucumber (9.24 d) and soybean (10.01 d). Fecundity was highest at 30 °C (86.80 eggs) and lowest at 15 °C (56.57 eggs). The fecundity of female mites increased with temperatures up to 30 °C, but at 35 °C it decreased (69 eggs). The host plants influenced female fecundity to a limited extent; the average number of eggs on bean, soybean and cucumber was 77, 69 and 69, respectively.

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