The influence of applying Boron on life table parameters of Tetranychus urticae Koch (Acari: Tetranychidae) on bean plants

The effect of four dose of Boron (0, 1, 1/5. 2 ppm) on the growth parameters of Tetranychus urticae Koch was studied on the red Akhtar bean cultivar under constant laboratory conditions (27±2ºC, 70±5%RH and 16L:8D) during 2014–2016. Results showed that the immature developmental times of males and females were significantly influenced by Boron. Tetranychus urticae laid significantly more eggs per day on control. The egg hatching percentage varied from88.25 to 94.20 percent. The minimum intrinsic rate of increase (rm) 0.210±0.01 (female/female/day), while the highest was recorded for 2 ppm tests 0.73±0.2 (female/female/day). The lowest net reproductive rate of female (R0) was observed in 2 ppm dose (4.2.±2/04) while thehighest was in control treatment (12.10±0.06) (female/female/generation). The lowest intrinsic rate of increase (λ) (0.93±1.02) was obtained in 2 ppm treatments, whenever 0 ppm treatment displayed the highest values of these parameters (1.230±1.40). The mean generation time varied from 15.2±0.24 day to 11.65±0.5 days. Doubling time (DT) varied significantly on different tests. The longest was in 2 ppm and the shortest was in control treatment. Therefore, the results have proved that 2 ppm sample has excellent potential for applying in Integrated Pest Management of Tetranychus urticae.