Growth and development of geographic and crossbred strains of colonized Simulium decorum (Diptera: Simuliidae)

1981 ◽  
Vol 59 (11) ◽  
pp. 2072-2079 ◽  
Author(s):  
R. J. Brenner ◽  
E. W. Cupp ◽  
M. J. Bernardo
Keyword(s):  
New York ◽  
Sexual Dimorphism ◽  
Growth And Development ◽  
Adult Emergence ◽  
Reproductive Rate ◽  
Adult Survival ◽  
Degree Days ◽  
Net Reproductive Rate ◽  
Simulium Decorum ◽  
Pass Through

The developmental times from larval hatch to adult emergence were computed for strains of Simulium decorum from Warm Springs, Georgia (GA), and Dryden Lake, New York (DL). Rearings were conducted at several constant temperatures. Differences between geographic strains and between sexes within strains were significant in nearly every instance (P < 0.01). At cool temperatures (13 to 17 °C), the GA strain developed more quickly; however, this trend was reversed at intermediate temperatures (18 to 20 °C), and at 21 °C only GA males developed faster than DL males. With few exceptions, both sexes of the GA strain required more cumulative degree-days for development than their northern counterparts.The number of instars was determined for each strain by measuring the length of the postgena of head capsules collected during warm (21 °C) and cool (13 °C) rearings. Although both strains pass through seven stadia, differences between strains were noted in the size of middle instars. In all rearings sexual dimorphism was evident in the morphology of last-instar head capsules; in rearings conducted at cool temperatures (13 °C), sexes could also be separated by the size of last-instar head capsules.Strains were crossed and their progeny reared. High values for net reproductive rate (R0), fecundity, and adult survival suggest that heterosis resulted from crossbreeding the two geographic strains.

scholarly journals Development, biology, and life table parameters of the predatory species, Clitostethus brachylobus Peng, Ren & Pang 1998 (Coleoptera: Coccinellidae), when fed on the whitefly, Bemisia tabaci (Genn.)

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Xingmin Wang ◽  
Hui Deng ◽  
Cailian Du ◽  
Shaukat Ali
Keyword(s):  
Bemisia Tabaci ◽  
Survival Rates ◽  
Adult Emergence ◽  
Reproductive Rate ◽  
Adult Survival ◽  
Life Stages ◽  
Life Table Parameters ◽  
Net Reproductive Rate ◽  
Female Longevity ◽  
The Mean

Abstract The predatory species, Clitostethus brachylobus Peng, Ren & Pang 1998 (Coleoptera: Coccinellidae), native to China, has been reported as a predator of the whitefly species, Bemisia tabaci (Genn.). Present study describes the development and biological characteristics of C. brachylobus. Developmental periods of different immature stages showed significant differences, when fed on different life stages of B. tabaci. Prey consumption capacity was reduced by the increase in prey age. Female longevity was 193.5 days, whereas fecundity was 154.70 eggs/female. Net reproductive rate was 53.60, whereas the mean generation time was 102.64 days. The daily adult survival rates gradually decreased 120 h post-adult emergence.

Comparative performance and digestive physiology of Diaphania indica (Lepidoptera: Crambidae) on Trichosanthes anguina (Cucurbitaceae) cultivars

2020 ◽  
Vol 110 (6) ◽  
pp. 756-766 ◽  
Author(s):  
Rahul Debnath ◽  
Syed Husne Mobarak ◽  
Paroma Mitra ◽  
Anandamay Barik
Keyword(s):  
Development Time ◽  
Adult Emergence ◽  
Reproductive Rate ◽  
Intrinsic Rate Of Increase ◽  
Food Utilization ◽  
Comparative Performance ◽  
Net Reproductive Rate ◽  
Diaphania Indica ◽  
Rate Of Increase ◽  
Proteolytic Activities

AbstractDiaphania indica (Saunders) (Lepidoptera: Crambidae) is an important phytophagous pest of Trichosanthes anguina L. in India. We studied life table parameters by age-stage, two-sex, amylolytic and proteolytic activities, and food utilization parameters of D. indica on the leaves of three T. anguina cultivars (Baruipur Long, Polo No. 1 and MNSR-1). Further, nutrients (total carbohydrates, proteins, lipids, amino acids and nitrogen) and antinutrients (total phenols, flavonols and tannins) in leaves were determined. The development time (egg to adult emergence) was the shortest on MNSR-1 (19.79 d) and the longest on Polo No. 1 (25.72 d). Fecundity was the highest and lowest on MNSR-1 (259 eggs) and Polo No. 1 (151.22 eggs), respectively. The lowest intrinsic rate of increase (rm) and net reproductive rate (R0) of D. indica on Polo No. 1 were 0.1112 d−1 and 27.22 offspring individual−1, respectively. The mean generation time (T) was the shortest on MNSR-1 (23.99 days) and the longest on Polo No. 1 (29.70 d). The larvae of D. indica fed with MNSR-1 had the highest level of amylolytic and proteolytic activities, and the lowest activities were in the larvae fed with Polo No. 1. The fifth-instar larvae fed with Polo No. 1 had the lowest consumption index and growth rate. The higher larval development time and lower fecundity of D. indica on Polo No. 1 were due to the lower level of nutrients and a higher level of antinutrients than other cultivars. Our results concluded that Polo No. 1 cultivar could be suggested for cultivation.

scholarly journals Effect of sublethal doses of abamectin on demographic traits of tomato leafminer Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae)

2017 ◽  
Vol 57 (3) ◽  
pp. 256-267
Author(s):  
Idin Zibaee ◽  
Mojtaba Esmaeily
Keyword(s):  
Adult Emergence ◽  
Reproductive Rate ◽  
Tuta Absoluta ◽  
Intrinsic Rate Of Increase ◽  
Adult Longevity ◽  
Reproduction Rate ◽  
Net Reproductive Rate ◽  
Tomato Leafminer ◽  
Rate Of Increase ◽  
Sublethal Concentrations

Abstract The tomato leafminer, Tuta absoluta is a serious pest of tomato crops worldwide. In this study the effect of sublethal concentrations of abamectin (at 10 and 30% lethal concentrations, LC10 and LC30) was investigated on developmental and reproduction parameters of the tomato leafminer Tuta absoluta. Lethal concentrations were estimated by leaf dip bioassay on the fourth instar larvae of the T. absoluta that, LC50, LC30 and LC10 were 0.23, 0.15 and 0.12 mg · l−1, respectively. The sublethal concentrations led to significant decreases in adult emergence, the percentage of pupation of the parent generation, fecundity and adult longevity compared to the control. Sublethal concentrations significantly decreased the net reproductive rate (R0), intrinsic rate of increase (r), finite rate of increase (λ), and gross reproduction rate (GRR). There was a significant decrease in the time to egg developmental and doubling time (DT) of T. absoluta. However, sublethal concentrations of abamectin had no significant effects on the percentage of pupation, larva, prepupa and pupa developmental periods, hatchability and sex ratio of offspring. The results of this study indicated that sublethal concentrations of abamectin could influence some biological parameters of T. absoluta. The results could also be helpful for making better management decisions for controlling the tomato leafminer.

Effect of temperature on biological parameters of Aphidius matricariae, the Aphis fabae parasitoid

2016 ◽  
Vol 66 (3-4) ◽  
pp. 335-345
Author(s):  
Eliza Pourtaghi ◽  
Asghar Shirvani ◽  
Maryam Rashki
Keyword(s):  
Biological Control ◽  
Adult Emergence ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Aphis Fabae ◽  
Effect Of Temperature ◽  
Intrinsic Rate Of Increase ◽  
Net Reproductive Rate ◽  
Aphidius Matricariae ◽  
Rate Of Increase

Aphids can have devastating effects on agriculture and horticulture, and biological control agents form an important means of controlling them.Aphidius matricariaeHaliday is an important endoparasitoid for the suppression of aphid pest population outbreaks. In this research, the influence of three different temperatures, 20, 25 and 30°C, on some life cycle charactersitic ofA. matricariaewas studied under laboratory conditions when present on its host,Aphis fabaeScopoli. At 30°C, the intrinsic rate of increase, net reproductive rate, finite rate of increase, mean generation time and increase rate in one week were all significantly lower compared to the lower temperatures. The results showed that temperature had a significant effect on the duration of parasitoid development from oviposition to adult emergence. Moreover, the value of doubling time was higher at 30°C than at 20 and 25°C. The parasitoid had the shortest longevity, life span and lowest fecundity at 30°C. This investigation of temperature-dependent development and reproduction can help in the management of biological control programs. The results of this study demonstrate thatA. matricariaeis able to perform, and be mass produced, as a favorable and proper natural enemy for the biocontrol ofA. fabaeat a temperature range of 20-25°C.

scholarly journals EFFECTS OF CARBOSULFAN ON THE BIOLOGY OF BIRD CHERRY OAT APHID

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
S Ahamd ◽  
Z Hera ◽  
MS Hanif ◽  
AH Syed
Keyword(s):  
Survival Rate ◽  
Rhopalosiphum Padi ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Adult Survival ◽  
Intrinsic Rate Of Increase ◽  
Wheat Crop ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Adult Survival Rate

Aphids are the most commonly occurring, destructive, sap sucking and serious threat to cereal crops especially wheat (Triticum aestivum). Bird Cherry Oat aphid Rhopalosiphum padi (L.), is one of the most important aphids on T. aestivum which is one of the most consumed food and a source of nutrition in Pakistan. It causes considerable yield loss in wheat. Carbosulfan, a carbamate, is of the most commonly used pesticide against R. padi. The effects of Carbosulfan on generations of R. padi were performed under standard lab conditions by exposing adult aphids to three different concentrations (1.4×10-7 ppm, 1.4×10-10 ppm, 1.4×10-13 ppm) of Carbosulfan (Advantage® EC). Based on the results, all three concentrations noticeably reduced the pre-adult survival rate. 1.4×10-13 significantly extended the development duration of 1st instar, 2nd instar and 3rd instar nymphs. 1.4×10-13 ppm also extended the total pre-adult period and female longevity of R. padi. The total longevity was increased by 1.4×10-10 ppm. However, the fecundity decreased the most at 1.4×10-10 ppm. While the TPRP and APRP increased the most at 1.4×10-13 ppm. In the  life table parameters, both the intrinsic rate of increase (r) and the finite rate of increase (ƛ) decreased at 1.4×10-7 ppm and 1.4×10-10 ppm, as well as the net reproductive rate (R0) also decreased at 1.4×10-7 ppm and 1.4×10-10 ppm, while mean generation time (T) showed increase  at 1.4×10-13 ppm. Thus, at the concentrations of Carbosulfan tested here, there were negative impacts on R. padi fitness and biology by decreased pre-adult survival rate, λ, r, and R0. The concentrations also slowed down the development of some stages and extended T. My results would be helpful in assessing the overall effects of Carbosulfan on R. padi and should be taken into consideration when use Carbosulfan as a seed dressing insecticide for management of R. padi in wheat crop.

Effect of temperature on development and population growth rates of Spilostethus pandurus (Scopoli) (Hemiptera: Lygaeidae) in Giza, Egypt

1995 ◽  
Vol 16 (1) ◽  
pp. 17-25 ◽  
Author(s):  
M. M. El-Shazly
Keyword(s):  
Adult Emergence ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Natural Increase ◽  
Effect Of Temperature ◽  
Instantaneous Rate ◽  
Net Reproductive Rate ◽  
Population Growth Rates ◽  
Successive Generations ◽  
Spilostethus Pandurus

AbstractThe effects of temperature on the life history of Spilostethus pandurus (Scopoli) were examined by determining the different developmental and reproductive parameters with respect to days of hatching, oviposition, and adult emergence of insects reared in field cages at Giza, Egypt. Hatching, oviposition, and adult emergence continued all year round; the average daily temperature in the coldest month (January) seemed to be above developmental thresholds for different stages. This lygaeid completed six overlapping generations in 1 year. The basic population parameters, i.e. net reproductive rate (R0), gross reproductive rate (GRR), instantaneous rate of natural increase (r), finite rate of natural increase (λ), and mean generation time (T) exhibited a more or less cyclic pattern in successive generations. The highest value of r (rmax) was considered as the intrinsic rate of natural increase of this species.

scholarly journals Fertility Life Tables of Plastanoxus westwoodi (Kieffer) (Hymenoptera: Bethylidae) on Cryptolestes pusillus (Schon.) (Coleoptera: Cucujidae)

1970 ◽  
Vol 16 ◽  
pp. 25-28
Author(s):  
MM Rahman ◽  
W Islam ◽  
KN Ahmed
Keyword(s):  
Life Table ◽  
Adult Emergence ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Natural Increase ◽  
Life Tables ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Host Instar ◽  
Cryptolestes Pusillus

Plastanoxus westwoodi is an efficient ectoparasitoid of larvae and pupae of the red flat grain beetle Cryptolestes pusillus. Fertility life tables and effects of host instar on life table parameters of P. westwoodi on C. pusillus were studied in the laboratory. Generally adult females lived for 13-16 days. Oviposition commenced on the 1st day of adult emergence and continued till death or 1-2 days before the death of a parasitoid. The intrinsic rate of natural increase (rm) was found to be 0.2291 per female per day. The net reproductive rate (R0) was 64.07; the innate capacity for increase (rc) was 0.2096. The finite rate of increase (λ) was calculated as 1.4735 per female per day, while corrected generation time (T) was computed as 18.16 days. Key words: Plastanoxus westwoodi, Cryptolestes pusillus, Oviposition, Life table, Biological control   DOI:10.3329/jbs.v16i0.3737    J. bio-sci. 16: 25-28, 2008   

Evaluation of Degree-Day and Julian-Day Logistic Models in Predicting Cabbage Maggot (Diptera: Anthomyiidae) Emergence and Flight in Upstate New York

2003 ◽  
Vol 38 (4) ◽  
pp. 525-532 ◽  
Author(s):  
J. L. Jyoti ◽  
A. M. Shelton ◽  
J. Barnard
Keyword(s):  
New York ◽  
Control Strategies ◽  
Logistic Models ◽  
Adult Emergence ◽  
Delia Radicum ◽  
Degree Days ◽  
Planting Dates ◽  
Upstate New York ◽  
Spring Generation ◽  
Cabbage Maggot

A 2 yr (1999–2000) study using water-pan traps in the field indicated four generations, including the spring generation, of cabbage maggot adults, Delia radicum (L.), in upstate New York. On average over the 2 yrs, an accumulation of 160.7 ± 8.1 degree-days and 120 ± 3 Julian-days was required for the first adult emergence of flies from overwintered puparia (spring generation). The emergence of 10% of the population required a mean accumulation of 176.6 ± 3.8 degree days and 122.0 + 1.0 Julian days, 25% emergence required 204.2 ± 2.3 degree days and 125.0 ± 1.0 Julian days, 50% emergence required 251.3 ± 3.5 degree-days and 129.3 ± 1.5 Julian days, 75% emergence required 297.6 ± 30.4 degree-days and 132.0 ± 0.0 Julian days, and 95% emergence required 390.9 ± 10.1 degree days and 141.0 ± 3.0 Julian days. From the emergence of the first adult flies, the population required a mean accumulation of 449.2 ± 1.4 degree days to complete the spring emergence. For complete emergence of flies, the F1 generation required a mean accumulation of 508.4 ± 32.9 degree days, the F2 generation required 465.3 ± 21.5 degree days and the F3 generation required 399.1 ± 3.1 degree days. With the help of a degree-days model, it is possible to predict fly emergence in the spring and succeeding generations. This model can help growers minimize insecticide use through better timing of treatments or adjustment of planting dates. In addition, this model will be useful in developing sampling plans and control strategies for immature stages of cabbage maggot.

scholarly journals Comparative demography of the exotic Harmonia axyridis with other aphidophagous coccinellids reared on artificial diet

2014 ◽  
Vol 49 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Julianne Milléo ◽  
Francisco Sales Fernandes ◽  
Wesley Augusto Conde Godoy
Keyword(s):  
Life Table ◽  
Harmonia Axyridis ◽  
Reproductive Rate ◽  
The Other ◽  
Adult Longevity ◽  
Net Reproductive Rate ◽  
Anagasta Kuehniella ◽  
Survival Percentage ◽  
Comparative Demography ◽  
Biological Aspects

The objective of this work was to compare biological aspects and life table parameters of the coccinellids Harmonia axyridis, Cycloneda sanguineaand Hippodamia convergens. Insects were fed eggs of Anagasta kuehniella, and reared at 24.5±1ºC, 70±10% relative humidity, with a 12 hour photophase. Hippodamia convergenstook about 1.6 day to complete development, longer than H. axyridis, and 2.4 day longer than C. sanguinea.At immature stages, H. axyridisexhibited the highest survival percentage (49.2%), in comparison to the other coccinellids. For mean adult longevity, H. convergenswas deficient, in comparison with the other species. Mean period of pre oviposition was the longest in C. sanguinea; the longest oviposition time occurred for H. axyridis; and the post oviposition period was similar between the coccinellids. Considering the reproductive parameters, H. axyridisshowed the best performance in all aspects. For life table, the values of H. convergenswere higher than, although close, to those of H. axyridis. Nevertheless, the high net reproductive rate of H. axyridis showed this species potential to increase population size. The biological characteristics of the exotic H. axyridis favors its invasion and establishment in Brazil, corroborating results noticed in other countries.

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.

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