Comparative life table analysis of Tetranychus urticae (Acari: Tetranychidae) on 14 soybean genotypes

Abstract The life table parameters of two‐spotted spider mite (TSSM), Tetranychus urticae Koch, on 14 soybean genotypes (Sari, Sahar, Tellar, Zane, Ks3494, L₁₇, Dpx, 032, 033, Clark, Hill, I27, Tms and Williams) were evaluated at 28 ± 1°C, 65%± 5% RH and a photoperiod of 16 : 8 h L : D. The survivorship data (l_x) of adult females were fitted to the Weibull frequency distribution model in all genotypes tested. Based on the Weibull parameters, the survival curve was type I on all genotypes, which indicated that the mortality mostly occurred in old individuals. Furthermore, two mathematical models (Analytis and Enkegaard) were fitted to age‐specific fecundity data (m_x). The highest intrinsic rate of increase (r_m) was recorded on L₁₇ (0.392) and the lowest values of this parameter were obtained on Tms (0.233), Hill (0.236), 032 (0.236), I27 (0.237) and Clark (0.240). In addition, net reproductive rate (R₀) and finite rate of increase (λ) of the TSSM had the highest value on L₁₇ as 45.521 and 1.475, respectively. The lowest values of these parameters were recorded on Tms as 12.149 and 1.258, respectively. Doubling time (DT) varied significantly on different genotypes and the shortest and longest values of this period were obtained on L₁₇ and 032, respectively. Our findings revealed that Tms, Hill, 032, I27 and Clark were less suitable genotypes, suggesting that they are more resistant to the TSSM than the other genotypes.