scholarly journals A laboratory and field condition comparison of life table parameters of Aphis gossypii Glover (Hemiptera: Aphididae)

2015 ◽  
Vol 55 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Behnaz Hosseini-Tabesh ◽  
Ahad Sahragard ◽  
Azadeh Karimi-Malati
Keyword(s):  
Population Dynamics ◽  
Relative Humidity ◽  
Life Table ◽  
Aphis Gossypii ◽  
Field Conditions ◽  
Life Table Parameters ◽  
Laboratory Conditions ◽  
Rate Of Increase ◽  
Aphis Gossypii Glover ◽  
Field And Laboratory Conditions

Abstract Life table studies are essential tools for understanding population dynamics. The life table parameters of Aphis gossypii Glover (Hemiptera: Aphididae) feeding on the host plant, Hibiscus syriacus L. were studied under laboratory (25±1°C and relative humidity of 65±5% and a photoperiod of 16L : 8D h) and field conditions (23-43°C, and relative humidity of 27-95%). The data were analysed using the age-stage, two-sex life table theory. The life table studies were started with 50 and 40 nymphs in laboratory and field conditions, respectively. Under laboratory conditions, A. gossypii reared on H. syriacus had a higher survival rate, fecundity, and longevity than those reared under field conditions. When reared under field conditions, A. gossypii had a longer nymphal developmental time, shorter adult longevity, and lower fecundity than those reared under laboratory conditions. The intrinsic rate of increase (r), net reproductive rate (R0), and the finite rate of increase (λ) under laboratory conditions, were higher than those obtained under field conditions. Nevertheless, there were no significant differences in the mean generation time T (days) between field and laboratory conditions. In the present study, the results clearly showed that life table parameters of A. gossypii were significantly different under field and laboratory conditions. These results could help us to understand the A. gossypii population dynamics under field conditions. The results could also help us make better management decisions for economically important crops

scholarly journals The Effect of Prey Density on Life Table Parameters of Hippodamia variegata (Coleoptera: Coccinellidae) Fed on Aphis gossypii (Hemiptera: Aphididae) under Laboratory Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Soodeh Davoodi Dehkordi ◽  
Ahad Sahragard ◽  
Jalil Hajizadeh
Keyword(s):  
Life Table ◽  
Prey Density ◽  
Aphis Gossypii ◽  
Reproductive Rate ◽  
Intrinsic Rate Of Increase ◽  
Life Table Parameters ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Hippodamia Variegata ◽  
Preovipositional Period

Life table gives the most comprehensive explanation of the survivorship, development, and reproduction of a population. The life table parameters of ladybeetle, Hippodamia variegata (Coleoptera: Coccinellidae), on different densities (20, 40, 60, 80, and 100) of third instar nymphs of Aphis gossypii were studied in a growth chamber (°C, % RH, and a photoperiod of 16L: 8D h). The adult preovipositional period and the total preovipositional period of female H. variegata were reduced as the prey density increased. The oviposition period was longer when prey density increased. Female longevity also increased significantly with increasing prey density. Fecundity was dependent on prey density. The lowest fecundity was obtained at density of 20 prey () and the highest at density of 100 ( eggs). Intrinsic rate of increase was dependent on prey density and ranged from to  d−1 (female/female/day) with increasing prey density. Net reproductive rate and gross reproductive rate were also increased with increasing prey density. The peak reproductive values were dependent on prey density. However, mean generation time decreased as prey density increased. It was concluded that the increase in the density of A. gossypii nymphs had positive and significant effects on reproductive parameters of H. variegata.

scholarly journals Effects of five different melon (Cucumis melo L.) cultivars on population growth of Aphis gossypii (Glover)

2021 ◽  
Vol 57 (No. 4) ◽  
pp. 310-317
Author(s):  
Evin Polat Akkopru ◽  
Serdal Bozkurt
Keyword(s):  
Population Growth ◽  
Pest Management ◽  
Life Table ◽  
Cucumis Melo ◽  
Growth Parameters ◽  
Aphis Gossypii ◽  
Management Program ◽  
Intrinsic Rate Of Increase ◽  
Rate Of Increase ◽  
Aphis Gossypii Glover

 In this study, population growth parameters of Aphis gossypii Glover (Hemiptera: Aphididae) on five different melons [Cucumis melo Linnaeus (Cucurbitaceae) cultivars (Balin, Çıtırex, 221 F1, Gediz, Yusufbey)], which are commonly grown in Turkey, were investigated in laboratory experiments. Life table parameters were estimated according to age-stage and two-sex life table theory. The results showed that A. gossypii developed more successfully on the Gediz cultivar due to the higher intrinsic rate of increase (0.5042 1/day), the finite rate of increase (1.6557 1/day) and the shorter mean generation time (8.161 days) than the other cultivars. Ecological pest control against aphids' use of resistance or less favourable host plant cultivars is considered one of the significant components of pest management. The findings obtained in this study can be used in the pest management program designed for the aphid.

scholarly journals Comparative analysis of life tables of Bactrocera tau (Diptera: Tephritidae) collected from different geographical regions of North India

2017 ◽  
Vol 9 (2) ◽  
pp. 998-1001
Author(s):  
Priyanka Thakur ◽  
K.C. Sharma ◽  
Deepali Bakshi
Keyword(s):  
Life Table ◽  
Life Histories ◽  
Management Practices ◽  
Fruit Fly ◽  
North India ◽  
Multiplication Rate ◽  
Life Table Parameters ◽  
Geographical Variations ◽  
Rate Of Increase ◽  
Geographical Regions

The tomato fruitfly, Bactrocera tau (Walker) (Diptera: Tephritidae) is one of the most important pests of the family Cucurbitaceae. Toinvestigate local adaptation, we measured the variations in life-histories and life-table parameters among populations from five different geographical regions of North India, Ludhiana (262 mt amsl), Solan (1,502 mt amsl), Hisar (215 mt amsl), Pantnagar (344 mt amsl) and Jaach (733 mt amsl). The principal components analysis showed the life-history and life-table parameters of B. tau differed among the five geographical populations. The highest fecundity of 233.20 eggs/female was recorded in the Jaach population and was statistically at par with Hisar (209.21 eggs/female) followed by Solan (202.60 eggs/female), Pantnagar (178.60 eggs/female) and Ludhiana population (105.88 eggs/female). The total developmental period among the five populations of B. tau was the longest for the Pantnagar population (16.20 days) followed by Solan (13.90 days), Hisar (12.60 days), Ludhiana (12.30 days) and Jaach (11.60 days). The true intrinsic rate of natural increase (rm) was 0.120, 0.138, 0.140, 0.116 and 0.153 for the respective geographical regions while the finite rate of increase (λ) was 1.13, 1.15, 1.15, 1.12 and 1.16, thus indicating that the fruit fly from Jaach location is more reproductive than the other five geographical regions of North India. Since the study will be useful in knowing the multiplication rate of fruit fly in specific area, accordingly the management practices for this species can be formulated on the bases of these studies. The results thus indicated the geographical variations among different populations of B. tau.

scholarly journals Regulatory potential of parasitoids over Aphis gossypii Glover, 1877 populations (Hemiptera: Aphididae) under semiarid laboratory conditions

2019 ◽  
pp. 89-96
Author(s):  
Raouf Bensaad ◽  
Yannick Outreman ◽  
Anne le Ralec ◽  
Yamina Guenaoui
Keyword(s):  
Biological Control ◽  
Sex Ratio ◽  
Aphis Gossypii ◽  
Parasitoid Species ◽  
Lysiphlebus Testaceipes ◽  
Laboratory Conditions ◽  
Aphidius Matricariae ◽  
Aphis Gossypii Glover ◽  
Regulatory Potential ◽  
Semi Arid

Este estudio tiene como objetivo evaluar el potencial regulador de Lysiphlebus testaceipes y Aphidius matricariae sobre Aphis gossypii en condiciones de laboratorio semiáridas. Nuestros resultados mostraron que la longevidad de las hembras de L. testaceipes fue significativamente menor que la de A. matricariae. El porcentaje diario de momificación fue más importante para L. testaceipes que para A. matricariae y disminuyó con la edad de los parasitoides. En general, las tasas de momificación y de emergencia fueron más altas en L. testaceipes. La descendencia de A. matricariae se desarrolló en menos tiempo que la de L. testaceipes. La proporción sexual no varió respecto a las especies parasitoides. Con nuestros resultados, L. testaceipes fue más efectivo para el control biológico de A. gossypii en patata en agro-ecosistemas semiáridos. This study aims to evaluate the regulatory potential of Lysiphlebus testaceipes and Aphidius matricariae over Aphis gossypii in semiarid laboratory conditions. Our results showed that the longevity of L. testaceipes females was significantly lower than A. matricariae ones. The daily mummification rate of aphid was more important for L. testaceipes than for A. matricariae and declined with parasitoids age. Overall, both the mummification rates and the emergence rates were the highest in L. testaceipes. A. matricariae offspring developed in a shorter time compared to L. testaceipes ones. The overall sex ratio did not vary according to parasitoid species. From our results L. testaceipes was more effective for the biological control of A. gossypii on potato in the semi-arid agro-ecosystems.

The response of common bean (Phaseolus vulgaris L.) to salinity and drought stresses and life table parameters of Tetranychus urticae Koch reared on it

2021 ◽  
Vol 26 (1) ◽  
pp. 62-74
Author(s):  
Samira Khodayari ◽  
Narmila Nematollahi ◽  
Fatemeh Abedini ◽  
Farzad Rasouli
Keyword(s):  
Phaseolus Vulgaris ◽  
Common Bean ◽  
Life Table ◽  
Tetranychus Urticae ◽  
Enzyme Activities ◽  
Dry Weight ◽  
Reproductive Rate ◽  
Saline Condition ◽  
Life Table Parameters ◽  
Rate Of Increase

Plants in nature are constantly exposed to various stresses resulting from fluctuating environmental conditions which adversely affect their growth and development and may affect the performance of herbivores feeding on them. Drought and salinity are the most serious problems of agriculture due to climatic changes. According to global warming and drying of Urmia salty lake in Northwestern Iran which could result in salinization of agricultural lands nearby, the focus of this study was to examine the effect of two above mentioned stresses on a host plant and its pest population. Three levels of salinity (50 (low), 100 (intermediate) and 150 (high) mM NaCl) and water deficit (40–50% the amount of water given to control plants) were induced to common bean (Phaseolus vulgaris) as stress factors and the following characteristics were measured: fresh and dry weight, leaf area, chlorophyll, carotenoid, proline and protein contents and CAT, APX and GPX enzyme activities. The life table parameters of two-spotted spider mite, Tetranychus urticae Koch, reared on stress-induced plants were measured and compared with control. The high saline condition caused plant defoliation and was deleted from results. The low saline condition caused an increase in fresh weight and decrease in chlorophyll and protein contents of plant. Intermediate saline condition caused an increase in APX and CAT enzyme activities and decrease of dry weight, chlorophyll, protein and proline contents. Drought condition caused an increase of APX and GPX enzyme activities and proline content and decrease of dry weight and chlorophyll content. Analysis of life table data of T. urticae showed a significant decrease of net reproductive rate (R0), mean generation time (T) and gross reproductive rate (GRR) of mites reared on plants under both of stresses. The intrinsic rate of increase (r) and finite rate of increase (λ) decreased significantly only for mites reared on plants under intermediate saline condition.

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