scholarly journals Effect of Different Temperatures on the Life Table Parameters of Rhyzobius Lophanthae Blaisdell (Coleoptera: Coccinellidae)

2021 ◽  
Author(s):  
Ali KAYAHAN ◽  
Qasim Hussein AHMED ◽  
İsmail KARACA
Keyword(s):  
Life Table ◽  
Optimum Temperature ◽  
Life Table Parameters ◽  
Generation Times ◽  
Different Temperatures ◽  
Total Productivity ◽  
The Mean ◽  
Reproductive Rates ◽  
Rhyzobius Lophanthae

Abstract The purple scale predator, Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae) is known as coccidophagous ladybird predator, and effective against scales’ insects. The present study aimed to evaluate the optimum temperature for the species to be more efficient. In this study, the life table parameters of R. lophanthae were determined on different temperatures at 4, 16, 18, 20, 22, 24, 26, 28, 30 and 32 °C and 60% RH, by calculations using RmStat-3 software according to Euler-Lotka equation. The results showed that the intrinsic rates of increase (rm) were 0.016, 0.022, 0.030, 0.052, 0.056, 0.068, 0.120, 0.142, 0.132, 0.021 females/females/day, respectively, while the net reproductive rates (R0) were 7.082, 9.514, 11.960, 50.906, 54.150, 49.525, 56.883, 80.944, 31.149, 1.882 females/females/generation, respectively. The mean generation times (T0) were 125.966, 104.602, 84.009, 75.742, 71.511, 57.568, 33.801, 30.866, 25.978, 30.759 days, respectively. Total productivity rates (GRR) were 34.865, 39.210, 48.216, 201.990, 209.469, 166.207, 177.779, 303.751, 105.751, 12.622 egg/female, respectively. The study concluded that 26-30 °C was the optimum temperature range for the efficient role of R. lophanthae under laboratory conditions. From the results, it is still needed to do more studies on the interactions of pests, predators with environmental conditions.

Biology and fertility life table of Oligonychus punicae Hirst (Acari: Tetranychidae) associated with eucalyptus in a clonal minigarden

2020 ◽  
Vol 25 (1) ◽  
pp. 103-112
Author(s):  
José Cláudio Barros Ferraz ◽  
Paulo Roberto Ramalho Silva ◽  
Matheus Pinheiro Amaranes ◽  
José Wagner da Silva Melo ◽  
Debora Barbosa de Lima ◽  
...  
Keyword(s):  
Life Table ◽  
Eucalyptus Grandis ◽  
Intrinsic Rate ◽  
Population Increase ◽  
Eucalyptus Species ◽  
Life Table Parameters ◽  
Eucalyptus Pellita ◽  
The Mean ◽  
Reproductive Rates ◽  
Corymbia Citriodora

The mite Oligonychus punicae has potential for development in Eucalyptus spp. in clonal minigardens. However, there is no information on its biological and reproductive parameters on eucalyptus species. The objective of this study is to evaluate the biological and reproductive performance of O. punicae on different species of eucalyptus cultivated in a clonal minigarden. Development time, survival, longevity, fecundity and life table parameters of O. punicae were determined on six species of eucalyptus (Eucalyptus urophylla, Eucalyptus brassiana, Eucalyptus grandis, Eucalyptus tereticorinis, Eucalyptus pellita and Corymbia citriodora). All eggs of O. punicae originated females and completed the cycle in all hosts. Differences were observed in development, longevity, pre-oviposition, oviposition and post-oviposition, and fecundity of females of O. punicae when different eucalyptus species were used as hosts for O. punicae. The best performance of O. punicae was observed on E. tereticornis, while the worst performance was observed on C. citriodora, on which the net reproductive rates (R0) ranged from 5.09 to 44.85, the intrinsic rate of population increase (rm) ranged from 0.09 to 0.19, the finite rate of population increase (λ) ranged from 1.10 to 1.21, and the mean generation time (T) ranged from 0.09 to 0.19. These results suggest that E. tereticornis is an excellent host for O. punicae.

The effects of spirotetramat on the demographic parameters of Neoseiulus californicus (Phytoseiidae)

2018 ◽  
Vol 23 (10) ◽  
pp. 1952 ◽  
Author(s):  
Niloufar Sangak Sani Bozhgani ◽  
Katayoon Kheradmand ◽  
Ali asghar Talebi
Keyword(s):  
Life Table ◽  
Neoseiulus Californicus ◽  
Oviposition Period ◽  
Successful Implementation ◽  
Life Table Parameters ◽  
Total Fecundity ◽  
The Mean ◽  
Reproductive Rates ◽  
Excellent Tool ◽  
Total Life

Knowledge of the effects of pesticides on biological control agents is mandatory for the successful implementation of IPM programs. The aim of this study was to evaluate the effects of spirotetramat on the life table parameters of Neoseiulus californicus, under laboratory conditions [25 ± 2ºC, 70 ± 5% RH and 16:8 (L:D) h]. The experiments were carried out based on the leaf-dip technique. The experimental concentrations including 10000, 20000 and 30000 ppm of the spirotetramat were used in this study. The raw data was analyzed based on the age-stage, two-sex life table theory. The longevity, total life span, oviposition period, and total fecundity significantly decreased after exposure to concentrations of 20000 and 30000 ppm. The oviposition period was scored 26 days in the control cohort, which reduced to 22.87 days in the 30000 ppm. The total fecundity ranged between 29.45 and 39.46 (offspring/individual). Among the examined concentrations, the lowest values of the gross and net reproductive rates were 21.96 and 17.69 (offspring/individual), observed for the cohort treated with 30000 ppm concentration. Our findings showed the r and λ of N. californicus were not influenced by the different concentrations. The mean generation time (T) for control was the highest; the values for T varied from 18.35 days at control to 16.36 days at 30000 ppm. Therefore, it was concluded that spirotetramat can be introduced as a compatible pesticide alongside the predatory mite, N. californicus, which is an excellent tool that can be incorporated into the integrated pest management of T. urticae.

scholarly journals REPRODUCTIVE INTERPRETATION OF SOME BREVIPALPUS SPECIES ON TWO TEMPERATURES DEGREE, USING LIFE TABLE PARAMETERS

2021 ◽  
Vol 21 (No 1) ◽  
Author(s):  
Ebrahim A. A ◽  
Abdallah A. A. M. ◽  
Halawa A.
Keyword(s):  
Life Table ◽  
Pure Culture ◽  
Citrus Fruit ◽  
Navel Orange ◽  
Life Table Parameters ◽  
Suitable Host ◽  
Rapid Spread ◽  
Increase Rate ◽  
Different Temperatures ◽  
Two Temperatures

Genus Brevipalpus is considered one of the most important genera that belong to family Tenuipalpidae Berlese. In Egypt, Brevipalpus includes seven species solely, five of them are attacking citrus trees. B. phoenicis, B. californicus and B. noranae are the most dominant on Egyptian citrus. A pure culture of the three specieswere propagated on leaves of Common Navel orange variety. The mentioned species were studied at two different temperatures (25 and 30°C ± 2°C and 70 ± 5% R.H.). The obtained results enable us to conclude that between the three species of genus Brevipalpus, the citrus fruit most appropriate for the development of B. noranae, since the mite presents a reduced embryonic and post-embryonic period. The citrus fruit also provides the highest values of specific fertility, survival and of the intrinsic increase rate (rm), which indicates it as being a better suitable host for the mite which provide B. noranae to establish and rapid spread.

scholarly journals Resistance of canola cultivars affect life table parameters of Nysius cymoides (Spinola) (Hemiptera: Lygaeidae)

2016 ◽  
Vol 56 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Mehdi Mollashahi ◽  
Ahad Sahragard ◽  
Jafar Mohaghegh-Neyshabouri ◽  
Reza Hosseini ◽  
Hossein Sabouri
Keyword(s):  
Life Table ◽  
Insect Pests ◽  
Intrinsic Rate ◽  
Oviposition Period ◽  
Intrinsic Rate Of Increase ◽  
Adult Longevity ◽  
Resistance Level ◽  
Generation Times ◽  
Rate Of Increase ◽  
Reproductive Rates

AbstractA life table can be used as an important and appropriate tool to evaluate the susceptibility or resistance level of different host plant cultivars to insect pests. In the current study, we determined the suitability or inferiority of five different canola cultivars (Hayula420, Hayula401, Hayula50, Hayula60, RGS) to Nysius cymoides, under laboratory conditions. Data were analysed based on the age-stage, two-sex life table theory. Nysius cymoides which fed on Hayula420 had the longest nymphal period, while those which fed on Hayula50 had the shortest nymphal period. Developmental times (sum of incubation and nymphal periods) was longest for those which fe d on Hayula420 and the shortest for those which fed on Hayula50. The adult pre-oviposition period (APOP), total pre-oviposition period (TPOP), mean fecundity, and adult longevity of adults reared on different canola cultivars showed significant differences. The highest and lowest net reproductive rates (R0) were obtained for those which fed on Hayula420 (11.40 offspring per individual) and Hayula401 (5.47 offspring per individual), respectively. The highest value (0.0395 d-1) for the intrinsic rate of increase (r) was obtained for those which fed on Hayula 60 cultivar and the lowest value (0.0261 d-1) for those which fed on Hayula401 cultivar. The shortest and longest mean generation times (T) were obtained for those which fed on RGS and H401 cultivars, respectively. The lowest and highest values of life expectancy (exj) were obtained for those which fed on RGS and Hayula420 cultivars, respectively. The results showed that Hayula401 and RGS were not susceptible cultivars to N. cymoides. These cultivars showed higher resistance to N. cymoides, while Hayula60, Hayula420, and Hayula50 were found to be suitable cultivars but with lower resistance to N. cymoides, respectively.

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