Life Table Parameters and Oviposition Preference ofPlutella xylostella(Lepidoptera: Plutellidae) on Six Brassicaceous Crop Plants

2018 ◽  
Vol 112 (2) ◽  
pp. 932-938 ◽  
Author(s):  
Mahdieh Jafary-Jahed ◽  
Jabraeil Razmjou ◽  
Gadir Nouri-Ganbalani ◽  
Bahram Naseri ◽  
Mahdi Hassanpour ◽  
...  
Keyword(s):  
Life Table ◽  
Oviposition Preference ◽  
Crop Plants ◽  
Life Table Parameters

scholarly journals Effects of Delayed Mating on the Reproductive Performance of Henosepilachna vigintioctopunctata (F.) (Coleoptera: Coccinellidae)

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 629
Author(s):  
Ya-Ling Wang ◽  
Qi-Nian Jin ◽  
Xiang-Ping Wang
Keyword(s):  
Life Table ◽  
Mating Success ◽  
Doubling Time ◽  
Reproductive Rate ◽  
Oviposition Period ◽  
Population Doubling ◽  
Life Table Parameters ◽  
Effective Measure ◽  
Net Reproductive Rate ◽  
Henosepilachna Vigintioctopunctata

Henosepilachna vigintioctopunctata (F.) is a serious pest of numerous solanaceous crops in many Asian countries. The purpose of this study was to clarify the effects of delayed mating on mating success, fecundity, fertility, pre-oviposition period, oviposition period, adult longevity, and population life table parameters (including net reproductive rate, intrinsic and finite rates of increase, doubling time, and mean generation time) of H. vigintioctopunctata. Beginning three days after emergence for both sexes, mating was delayed an additional 0, 2, 4, 6, or 8 days. We compared the data when mating was delayed for males only with the data when mating was similarly delayed for females only. Reproductive and life table parameters were calculated from the two data sets and compared. The results showed that the preoviposition and oviposition period of adults was significantly reduced by delayed mating, while the preoviposition period was not significantly different in adults mated at older ages. The mating success rate, fecundity, and proportion of hatching eggs decreased with increasing mating age. Longevity was not affected by the age at mating. Mating delay also affected the life table parameters of H. vigintioctopunctata, with a similar trend observed in the net reproductive rate and intrinsic and finite rates of increase, all of which decreased gradually as the number of delay days increased. The population doubling time increased with increases in mating age. The results also showed that delayed mating was an effective measure to consider in controlling H. vigintioctopunctata. It is hoped that our data will provide a scientific basis and contribute technical guidance for forecasting and integrated management of this pest.

scholarly journals Does Diet of Prey Affect Life Table Parameters of the PredatorPodisus nigrispinus(Hemiptera: Pentatomidae)?

2018 ◽  
Vol 101 (1) ◽  
pp. 40-43
Author(s):  
Robson José Esteves Peluzio ◽  
Bárbara Monteiro de Castro e Castro ◽  
Bruno Pandelo Brügger ◽  
Angelica Plata-Rueda ◽  
Flávio Lemes Fernandes ◽  
...  
Keyword(s):  
Life Table ◽  
Life Table Parameters

Temperature-based phenology model for predicting the present and future establishment and distribution of recently invasive Spodoptera frugiperda (J. E. Smith) in India

2021 ◽  
pp. 1-15
Author(s):  
T. V. Prasad ◽  
M. Srinivasa Rao ◽  
K. V. Rao ◽  
S. K. Bal ◽  
Y. Muttapa ◽  
...  
Keyword(s):  
Life Table ◽  
Constant Temperature ◽  
Spodoptera Frugiperda ◽  
Life Table Parameters ◽  
Invasive Insect ◽  
Temperature Conditions ◽  
Risk Indices ◽  
Survival And Reproduction ◽  
Temperature Ranges ◽  
Phenology Model

Abstract Fall armyworm, Spodoptera frugiperda (J. E. Smith) is a polyphagous and highly destructive invasive insect pest of many crops. It was recently introduced into India and widely reported in almost all parts of India. Development of a temperature-based phenology model for predicting its rate of development and distribution will help in understanding the establishment and further spread of introduced invasive insect pests. Development, survival and reproduction parameters of S. frugiperda at six constant temperature conditions (15, 20, 25, 27, 30 and 35°C) were investigated and further validated with data generated under fluctuating temperature conditions. The estimated lower developmental threshold temperatures were 12.1°C for eggs, 11°C for larvae, 12.2°C for pupae, 15.13°C for males and 12.66°C for females. Degree-day (DD) requirements for the development of the different stages of S. frugiperda were 50, 250 and 200 DD for egg, larva and pupa, respectively. The best-fitted functions were compiled for each life stage to yield a phenology model, which was stochastically simulated to estimate the life table parameters. The developed phenology model predicted temperature ranges between 27 and 30°C as favourable for S. frugiperda development, survival and reproduction. The results revealed that maximum net reproductive rate (215.66 females/female/generation) and total fecundity (981.08 individuals/female/generation) were attained at 30°C constant temperature. The mean length of generations decreased from 74.29 days at 15°C to 38.74 days at 30°C. The maximum intrinsic rate of increase (0.138 females/female/day) and shortest doubling time (4.9 days) were also observed at 30°C. Results of simulated life table parameters showed high temperature-dependent development of S. frugiperda and complete development within all the tested constant temperature ranges (15–35°C). Simulated life table parameters for predicting risk indices of S. frugiperda in India indicated a significant increase in activity indices and establishment risk indices with a higher number of generations during future (2050 and 2070) climatic change scenarios compared to present conditions. Our results indicate that India will be highly suitable for the establishment and survival of S. frugiperda in future time periods.

Estimated mortalities of the immature stages of Aedes cantans (Mg.) (Diptera, Culicidae) in a natural habitat

1974 ◽  
Vol 64 (2) ◽  
pp. 265-276 ◽  
Author(s):  
K. H. Lakhani ◽  
M. W. Service
Keyword(s):  
Life Table ◽  
Adult Population ◽  
Natural Habitat ◽  
Age Distribution ◽  
Smooth Curve ◽  
Immature Stages ◽  
Life Table Parameters ◽  
Population Loss ◽  
Regular Sampling ◽  
Survivorship Model

AbstractFor three consecutive years the eggs, the immature stages and the emergent adults of Aedes cantans (Mg.) populations were sampled from a small woodland ditch in southern England with a view to constructing the life-table of the species. Estimates of the numbers of ‘viable’ eggs available for hatching and the size of the resultant adult population yielded an estimate of the probability of a ‘viable’ egg resulting in an adult. Estimating the mortality rates in different immature stages which occur simultaneously is known to be difficult. It was considered reasonable to rely on a generalised exponential survivorship model based on the assumption that the relative mortality rate during the duration of each instar of A. cantans is constant, but this rate may vary from instar to instar. The parameters of the model were estimated using experimental data on the duration and total incidences through regular sampling of different instars together with the estimate of the probability that a ‘viable’ egg would result in an adult. The survivorship picture thus obtained agreed closely with the survivorship pattern obtained using a graphical approach based on the construction of the stage-specific age distribution of the pre-adults, and then drawing a smooth curve through the age distribution to produce an approximation to the survivorship curve. Because mortality was similar in all three years, the three years' data were pooled to give estimates of the life-table parameters. These clearly showed that substantial population loss occurred in the first two larval instars of A. cantans.

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