امید به زندگی و ارزش تولیدمثلی کنه شکارگر فیتوزئید Amblyseius swirskii با تغذیه از دانه گرده گیاهان مختلف خانواده Rosaceae

The general predator mite of the phytoseiidae family, Amblyseius swirskii Athias-Henriot is classified as a type III feeding type. In this study, pollen of almond (Prunus amygdalus Batsch), apple (Malus domestica Borkh.), apricot (Prunus armeniaca L.), Japanese quince (Chaenomeles japonica (Thunb.)) and rose (Rosa chinensis Jacq.) were examined on two demographic statistics including life expectancy (Exj), and reproduction value (Vxj). Thus, an individual's anticipated future lifespan and their impact on future population growth could be evaluated. All experiments were conducted in the laboratory under controlled conditions of 25±1°C, 60±5% RH, and a photoperiod of 16:8h (L:D), with the cohorts of 24-hour eggs. After the pre-mature individuals reached to the adulthood, the female and male individuals were paired immediately. In this regard, survival and the eggs laid by the adult females were assessed daily and continued until the death of the last individual. In control, the predatory mites were fed on the pre-adult stage of Tetranychus urticae Koch. According to the results, newly laid eggs of A. swirskii in the apricot treatment were likely to survive for 61.58 days. This value for the Japanese quince, almond, apple, rose and control treatments was 53.46, 48.94, 44.31, 43.29, and 46.40 days, respectively. The reproductive value of each egg at this time in apricot treatment and other treatments was 1.19, 1.20, 1.17, 1.20, 1.18, and 1.17 respectively, which is equivalent to the finite rate of increase (λ=er). The newly appeared female mite in apricot treatment (6th day) had a life expectancy of 52.78 days and could lay eggs until the 42nd day. Also, females in apple, rose, and control treatments appeared on the 6th day, and their life expectancy was estimated at 37.89, 37.44, and 41.60 days, respectively. In these treatments, oviposition continued until days 50, 35, and 41, respectively. Females in almond and Japanese quince treatments appeared on the 5th day, and showed a life expectancy of 44 and 45.06 days, respectively. In both treatments, the predicted last day for the females to lay their eggs was 49th and 42st, respectively. Also, the maximum reproductive value in apricot and control treatments happened on the 10th day, and was 9.14, and 7.42, respectively. The maximum reproductive value of almond treatments (22nd day) was 8.66, apple (14th day) 9.56, Japanese quince (9th day) 9.38, and rose (11th day) 8.14. Therefore, pollen grains of the Rosaceae plants can be used as an alternative or supplementary food for A. swirskii, making it a considerable option for the mass rearing of this predator.