جستجوی مقالات مرتبط با کلیدواژه « جدول زندگی » در نشریات گروه « باغبانی »

Amblyseius swirskii Athias-Henriot predatory mite is one of the most common biological control agents for two-spotted spider mite, greenhouse whitefly and onion thrips in greenhouses, which is widely used in greenhouse crops around the world. The importance of this study is to facilitate the mass rearing of this predatory mite. To evaluate the mass rearing of this predator, its life table on eggs, nymphal stages and adult mites of Carpoglyphus lactis Linnaeus under conditions  of 25 °C, 70 ±5% RH, 16:8 (L:D) was examined. Demographic parameters of A. swirskii including: r, λ and R0 when feeding eggs, nymphal stages and adult were estimated. Therefore, r parameter for feeding at different growth stages of dried fruit mite was estimated in mass production part. In addition, 20 treatments with different compounds with presence and 20 treatments without presence of dried fruit mite with three replications in a completely randomized block design with mass rearing method and intrinsic rate of increase (r) for all treatments were estimated and analyzed. Survey of egg life table, nymphal and adult stages of dried fruit mite showed that A. swirskii has the ability to mass rearing on all three developmental stages of dried fruit mite. Life table parameters, A. swirskii including: r, λ and R0 when feeding on dried fruit eggs were estimated to be 0.165 d-1, 1.173 d-1, and 12.95 eggs/individual, respectively. The results of life table parameters, especially r, showed that dried fruit mite has the potential to be a suitable intermediate host. Furthermore, the artificial diet of treatment number 20 without the presence of dried fruit mites is suitable for mass breeding of this predatory mite as an alternative method.

In this research، the effect of ecdysteoidal extract from Spinacia oleracea L. (Chenopodiceae)، a plant producing phytoecdysteroids، was evaluated on the life table and population growth parameters of Ephestia kuehniella (Lepidoptera: Pyralidae). Ecdysteroidal extract of the plant leaves، containing 20 hydroxyecdysone، was incorporated into the food given to the insect. Newly hatched larvae (100 replications) were reared individually in test glasses. Data analysis demonstrated that the intrinsic rate of increase (rm)، mean generation time (T)، finite rate of increase (l) and net reproduction rate (R0) decreased significantly as concentration of the extract increased. In addition، doubling time (DT) increased significantly as concentration of the extract increased. Life expectancy of the insect (ex) alsoincreased. Total development duration in treated insects was always significantly longer than that in the control group. The control insects had four instar larvae، but it was six for the treated larvae. Data demonstrated that E. kuehniella was partially resistant to ingested exogenous ecdysteroids. Nevertheless، exogenous ecdysteroids were able to disrupt larval development and reduced the fertility. Therefore، this extract may be a potential protectant as botanical alternative agent، and can be used as a biopesticide to control E. kuehniella population.