49 research outputs found
Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars
No full textFahim, Shimaa F., El-Saiedy, El-Sayed M. (2021): Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars. Persian Journal of Acarology 10 (2): 191-204, DOI: 10.22073/pja.v10i2.6366
Figure 1 in Suitability of three eriophyid mites as prey for the predatory mite, Typhlodromus athiasae (Acari: Phytoseiidae)
No full textFigure 1. Age-stage specific survival rates (sxj) of Typhlodromus athiasae fed on Aceria kenyae, Aceria mangiferae, and Calepitrimerus baileyi.Published as part of Fahim, Shimaa F. & Momen, Faten M., 2022, Suitability of three eriophyid mites as prey for the predatory mite, Typhlodromus athiasae (Acari: Phytoseiidae), pp. 295-307 in Persian Journal of Acarology 11 (2) on page 299, DOI: 10.22073/pja.v11i2.72739, http://zenodo.org/record/717358
Figure 2 in Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars
No full textFigure 2. Mean numbers of Tetranychus urticae and Amblyseius swirskii populations on four strawberry cultivars during 2018/2019 season.Published as part of Fahim, Shimaa F. & El-Saiedy, El-Sayed M., 2021, Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars, pp. 191-204 in Persian Journal of Acarology 10 (2) on page 195, DOI: 10.22073/pja.v10i2.63667, http://zenodo.org/record/503805
Figure 3 in Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars
No full textFigure 3. Overall mean numbers of Tetranychus urticae and Amblyseius swirskii on four strawberry cultivars during (a) 2017/2018 and (b) 2018/2019 seasons.Published as part of Fahim, Shimaa F. & El-Saiedy, El-Sayed M., 2021, Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars, pp. 191-204 in Persian Journal of Acarology 10 (2) on page 196, DOI: 10.22073/pja.v10i2.63667, http://zenodo.org/record/503805
<p><strong>Development and reproduction</strong><strong> of </strong><strong><em>Amblyseius largoensis</em></strong><strong> (Acari: Phytoseiidae) </strong><strong>feeding </strong><strong>on two eriophyoid mites</strong></p>
No full textAmblyseius largoensis (Muma) is an important phytoseiid mite. The biological and life table parameters of A. largoensis preyed on two eriophyoid mites, Aceria ficus (Cotte) or Rhyncaphytoptus ficifoliae Keifer, were evaluated under laboratory conditions. In the present study, this predator was reared on two plant species (Acalypha wilkesiana Muell. and Ficus carica L.) and provided with A. ficus or R. ficifoliae as prey. Results showed that A. largoensis failed to complete its development on F. carica leaves and its individuals couldn’t reach the adult stage. In contrast, A. largoensis successfully completed its development and reproduced when reared on A. wilkesiana leaves and fed on A. ficus or R. ficifoliae. The pre-adult development of A. largoensis reared on A. wilkesiana leaves preyed on A. ficus (7.70 days) was faster than for those preyed on R. ficifoliae (8.95 days). Females fed on A. ficus showed higher number of oviposition days compared with those preyed on R. ficifoliae. Adult longevity was shorter for A. largoensis individuals fed on R. ficifoliae (22.20 days), but longer for those fed on A. ficus (26.35 days). Fecundity of A. largoensis females fed on A. ficus (25.00 eggs/female) was higher than that of those fed on R. ficifoliae (18.40 eggs/female). Amblyseius largoensis fed on A. ficus displayed better performance in terms of its population parameters, as proved by its higher values of intrinsic rate of increase (r) (0.193 day−1), finite rate of increase (λ) (1.213 day−1), and net reproductive rate (R0) (20.000 offspring) as compared to feeding on R. ficifoliae (r = 0.164 day−1, λ = 1.178 day−1, and R0 = 14.720 offspring). Although F. carica leaves seemed to be an unsuitable surface for the development of A. largoensis, the current results suggested that this phytoseiid may be promising in the control of other eriophyoid mite pests
<p><strong>Biology and life table parameters of some </strong><strong>phytoseiid mites</strong><strong> fed on <em>Oligonychus mangiferus</em> (Acari: Tetranychidae)</strong></p>
No full textThe mango red spider mite, Oligonychus mangiferus, is a dangerous pest of mango that causes an indirect reduction in the production and quality of mango fruits. Since there is an urgent need to control O. mangiferus, searching for native phytoseiids that can prey on O. mangiferus may provide promising results in the biological control of this mite pest. In this study, biological and life table parameters of the predatory mites Cydnoseius negevi, Neoseiulus barkeri, Paraseiulus talbii, and Typhlodromus athiasae were determined when fed on O. mangiferus under laboratory conditions. Cydnoseius negevi, N. barkeri, and T. athiasae were successfully fed and developed on O. mangiferus, while P. talbii failed to develop on O. mangiferus. The pre-adult duration did not differ significantly among the three phytoseiids. The longest female longevity was 40.28 days for N. barkeri, while the shortest was 26.04 days for C. negevi. The lowest daily fecundity was observed in N. barkeri females, whereas the highest was oviposited by C. negevi and T. athiasae. Statistically, Typhlodromus athiasae had the maximum intrinsic rate of increase (r) and finite rate of increase (λ), followed by N. barkeri and C. negevi. The shortest mean generation time (T) and the lowest net reproductive rate (R0) were reported for C. negevi. In conclusion, C. negevi, N. barkeri, and T. athiasae successfully fed, developed and sustained oviposition on O. mangiferus. Therefore, they could be considered as important biological control agents of O. mangiferus
<p><strong>The effects of maize pollen on development and population growth potential of <em>Amblyseius swirskii</em> and<em> Cydnoseius negevi</em> (Acari: Phytoseiidae) in subsequent generations</strong></p>
No full textDiet is an important component of mass-production system of bio-control agents. Thus, using a non-prey diet (such as plant pollen) instead of natural prey could be more cost-effective in mass-production of phytoseiid predatory mites. Therefore, the present study aimed to examine the multigenerational effect of maize, Zea mays L. (Poaceae), pollen diet on life table parameters of Amblyseius swirskii Athias-Henriot and Cydnoseius negevi (Swirski & Amitai) (Acari: Phytoseiidae) reared for one, five and 11 consecutive generations. The predatory mites A. swirskii and C. negevi successfully completed their development on maize pollen for up to 11 generations. In G1, oviposition days, adult longevity, and fecundity showed significantly higher values in the case of C. negevi as compared to A. swirskii. Despite statistically similar oviposition days in the G11, A. swirskii females (44.43 eggs/♀) deposited significantly more eggs than those of C. negevi (40.60 eggs/♀). There were no significant differences in finite rate of increase (λ), intrinsic rate of increase (r), net (R0) and gross (GRR) reproductive rates between the two predatory mites in G1 and G5 (P ≥ 0.05). In G11, individuals of C. negevi had significantly higher values of r (0.181 day−1) and λ (1.198 day−1) compared to those of A. swirskii (r = 0.159 day−1, λ = 1.173 day−1). However, there were no significant differences in R0 and GRR values between A. swirskii (R0 =34.18 offspring, GRR = 39.75 offspring) and C. negevi (R0 = 31.23 offspring, GRR = 35.44 offspring) in G11. In conclusion, maize pollen has a great potential as a suitable and cost-effective diet for developing the mass-production system of A. swirskii and C. negevi on non-prey diets, where the performance of these predators remained to some extent constant across generations
Effect of ageing on the micro-tensile bond strength of resin based composite when bonded with resin luting cement
No full textAbstractObjective: Resin based composite (RBC) restoration, existing at tooth bonding sites can compromise the bond between the framework and the tooth. Therefore, the aim of the study was to evaluate the effect of in vitro ageing of RBC on its micro-tensile bond strength with resin luting cement (RLC).Materials and methods: Forty standardised RBC blocks (4×6×8mm) were fabricated. Twenty blocks were divided into four groups (N=5 per group). Group 1 (control) received no ageing; in group 2, specimens were exposed to 500 cycles of thermocycling (TC) at 5–55°C; in group 3, specimens were exposed to 5000 cycles of TC and in group 4 specimens were placed in Sodium hydroxide (0.1N, NaOH) for one week. Following treatment, RBC blocks were paired with identical untreated RBC blocks and bonded, using RLC (Panavia F 2.0) under constant load. RLC was cured for 160s at the intensity of 650mWcm−2. Bonded blocks were sectioned using a diamond saw at 500rpm and 250 ground force. A total of 160 specimen sticks were subjected to micro-tensile bond strength testing (Bisco Inc., Virginia, USA) at a crosshead speed of 0.5mm/min. Fractographic analysis was performed using a stereomicroscope (63×). Means of micro-tensile bond strength (μ-tbs) were analysed with ANOVA and Tukey-Kramer multiple comparisons test (P=0.05).Results: μ-tbs was significantly higher for group 1 (54.20±7.34MPa) as compared to group 2 (44.17±8.61MPa) and group 3 (20.32±7.91MPa). Specimens in group 4 debonded prior to μ-tbs testing. 77.5% specimens in group1 and 100% specimens in groups 2 and 3 showed adhesive failures at the RBC and RLC bonding interface.Conclusion: RLC showed significantly lower micro tensile bond strengths when bonded to aged RBC as compared to when RLC was bonded to non-aged RBC
<strong>Life table parameters of <em>Tetranychus urticae</em> (Trombidiformes: Tetranychidae) on four strawberry cultivars</strong>
No full textThe two-spotted spider mite, Tetranychus urticae Koch is one of the most important pests of strawberry plants worldwide. The present study compared the biology and life table parameters of T. urticae on four strawberry cultivars, including Wanter star, Markez, Fortona and 029 under laboratory conditions. Female developmental times showed a significant difference when recorded on tested cultivars, while such a difference was not observed for the male ones. The developmental time was significantly longer on Wanter star and Fortona in comparison with the others (P = 0.00). Females of T. urticae exhibited the shortest oviposition period and adult longevity on Fortona and Wanter star, while having the longest periods on 029 in this report (P = 0.00). The lowest fecundity and daily eggs laid by females were recorded on Wanter star. The highest rate of fertility was recorded on 029 as compared to other cultivars; therefore, Wanter star is introduced as a resistant cultivar against T. urticae infestation
Innovative approach toward an algorithm for automated defect recognition for on-load-tap changers
No full textPower transformers are valuable assets in the power network, with the primary function to regulate the transmission and distribution voltage. The regulating device is the tap changer which sets the turn ratio. Tap changer failure is one of the leading causes of high-voltage power transformer failure. Most tap changer failures are caused by degrading contacts. Contact degradation may be the result of contact wear or of arcing-induced carbon deposition during on-load-tap (OLT) changes. Contact degradation increases contact resistance, causing increased heating and arcing, eventually leading to possible failure of the power transformer. Proper maintenance, therefore, requires a diagnostic system which can assess the condition of the contacts. The research presented is aiming at automated defect recognition and localisation from measured dynamic resistance measurement patterns, for two types of tap changers, the 'Diverter Switch' type and the 'Selector Switch' type OLT changer.Session 1: Network componentsDC systems, Energy conversion & Storag
