اثرات زیر کشندگی جدایه‌ی TV قارچ بیمارگر((Hypocreales: Clavicipitaceae Beauveria bassiana بر پارامترهای زیستی کنه‌ی شکارگرNeoseiulus californicus (Acari: Phytoseiidae)

The Neoseiulus californicus McGregor is one of the most important biological control agents for the two-spotted spider mite. In this research, the effect of subcutaneous concentrations (LC10, LC20, LC30) of TV isolate of Beauveria bassiana fungi was examined on growth population parameter of N. californicus under controlled conditions with temperature of 25 ± 1, relative humidity of 70 ± 5 and light period of 16 hours of brightness and 8 hours of darkness. For this purpose, 70 identical eggs, randomly collected from the treated materials on the third day of laying, and placed individually on 3 cm diameter cucumber plate disks. The eggs were examined on a daily basis and the length of the various stages of immature growth along with the mortality of each stage was recorded on a daily basis. After mating, the male and female mating together and the rate of egg production of each pair until the death of the last person was recorded, the data were analyzed based on the theory of bisexual life table..the highest gross reproductive rate (GRR) was 24.96 (offspring/individual) in treatment with control, and the lowest value of this parameter was 17.76 (offspring/individual) per plant in LC30 treatment, which was statistically significant between control treatment with concentration LC30 has a significant difference. The net reproductive rate (R0) in mites treated with LC20 and LC30 concentrations was 15.48 and 13.87 (offspring/individual), respectively. Which indicated a significant difference between LC20 and LC30 concentrations to compare with control. The intrinsic rate of population increase (r) for LC10, LC20 and LC30 and control treatments was 0.1690, 0.1649, 0.1613 and 0.1703 (day-1), which was not significantly different. The finite rate of increase in population (λ) In various treatments did not show a significant difference compared to control. The duration of a generation (T) decreased with LC20 and LC30 concentrations significantly. According to our data, the fungi did not have negative effect on the predatory growth parameters so it seems that we can introduced as the fungi alongside the predatory mite N. californicus that can be incorporated into the IPM.