Artifical Rearing Of Amblyseius Swirskii And Its Predation To Tetranychus Cinnabarinus

The fertility life table of the experimental population of Aleuroglyphus ovatus (Troupeau), Tetranychus cinnabarinus (Boisduval) and Amblyseius swirskii (Athias-Henriot) were constructed by life table technique. The predation function of A. swirskii on T. cinnabarinus was carried out using leaf-tray method. The main results are as follows:1. The fertility life table of the experimental population of A. ovatusThe fertility life table of the experimental population of A. ovatus, with wheat germ as its diet, were constructed at 28℃. The results showed that the net reproductive rate (Ro was 46.9941, the intrinsic rate of increase (rm) was 0.1658, the finite rate of increase (λ) was 1.1804, the mean generation time (T) was 23.2143 days and the doubling time for population (t) was 4.1794 days.2. The fertility life table of the experimental population of T. cinnabarinusThe fertility life table of the experimental population of T. cinnabarinus fed on Cucumis sativa leaves were constructed at 28℃. The results showed that the net reproductive rate (Ro) was 65.3500, the intrinsic rate of increase (rm) was 0.2675, the finite rate of increase (λ) was 1.3067, the mean generation time (T) was 15.6252 days and the doubling time for population (t) was 2.5912 days.3. Effect of prey species on the development and reproduction of A. swirskiiTwo kinds of diets, that is to say A. ovatus and T. cinnabarinus, were used to feed A. swirskii in laboratory at 28℃and 85% R.H. to study the effects of these diets on the development and reproduction of A. swirskii. The A. swirskii could prey on these diets and complete its natural development and reproduction. The average durations of egg, larva, pronymph and deunymph of A. swirskii preying on A. ovatus and T. cinnabarinus were 0.87 days and 0.85 days,0.95 days and 0.89 days,2.81 days and 2.42 days,4.43 days and 3.86 days. The longevity, oviposition duration and average lifetime fecundity of the adult female A. swirskii fed with A. ovatus and T. cinnabarinus were 28.29 days and 31.45 days,24.03 days and 28.31 days,31.18 and 40.58, respectively. T. cinnabarinus was favorable to the growth, development and reproduction of A. swirskii.The fertility life table parameters of experimental population of A. swirskii preying on A. ovatus and T. cinnabarinus were confirmed. The net reproductive rate (Ro) was 21.2839 and 27.9026, the intrinsic rate of increase (rm) was 0.1367 and 0.1481, the finite rate of increase (λ) was 1.1465 and 1.1596, the mean generation time (T) was 22.3736 days and 22.4835 days, the doubling time for population (t) was 5.0714 days and 4.6818 days, respectively. And it was showed that consuming T. cinnabarinus benefited the population of A. swirskii more than preying on A ovatus.The net reproductive rate (Ro), the intrinsic rate of increase (rm) and the finite rate of increase (λ) of A. swirskii (R0=27.9026; rm=0.1481;λ=1.1596) were lower than those of T. cinnabarinus (R0=65.3500; rm=0.2675;λ=1.3067).While the mean generation time (T) and the doubling time for population (t) of A. swirskii (T=22.4835; t=4.6818) were higher than those of T. cinnabarinus (T=15.6252; t=2.5912). The results showed that A. swirskii is a desirable biocontrol agent to against T. cinnabarinus at lower population stage.4. The predation function of A. swirskii on T. cinnabarinusThe predation of A. swirskii in different developmental stages on T. cinnabarinus was studied at 5 constant temperatures. The results showed that all functional response of A. swirskii in different developmental stages to T. cinnabarinus can be described as Holling II type within the range of tested temperatures. Among all stages and temperatures, female adult was the most efficient predatory stage at 28℃, predation number was the highest, which was 10.638, handing time (Th) was the lowest, which was 0.094 days, attack coefficient (a) was the highest, which was 0.925. In the same temperature treatment, the higher of prey density was, the larger of predation number was found and the lower of finding efficiency was observed. At same prey density, the density of predator affected the predatory ratio, in which the number of predation was slowly decreased with the increased density of predator. predation capacity and searching efficacy of A. swirskii increased with the increase of temperature at 18-26℃. Intraspecific interference was found in the experiment. The average predation number and predation rate of A. swirskii decreased with the increasing of its density. The relationship between predation ratio (E) and natural enemy density of A. swirskii (P) was described by equation of E=0.330P-0.572. The relationship between intensity of scrambling competition (I) and natural enemy density of A. swirskii (P) was described by equation of I=0.036+0.7601gP. The prey preference of A. swirskii to different stages of T. cinnabarinus showed that under same prey density ratio female adult of A. swirskii prefer to feed on eggs than on nymphs or larvae of T. cinnabarinus, whereas prefer to feed on larvae than on nymphs.