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

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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Nondetrimental impact of two concomitant entomopathogenic fungi on life history parameters of a generalist predator, Coccinella septempunctata (Coleoptera: Coccinellidae)

Scientific Reports ◽

10.1038/s41598-021-00037-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Muhammad Rizwan ◽

Bilal Atta ◽

Muhammad Arshad ◽

Rashad Rasool Khan ◽

Asli Dageri ◽

...

Keyword(s):

Side Effects ◽

Life Table ◽

Entomopathogenic Fungi ◽

Coccinella Septempunctata ◽

Reproductive Rate ◽

Control Treatment ◽

Generalist Predator ◽

Life Table Parameters ◽

Net Reproductive Rate ◽

Fecundity Rate

AbstractThe non-persistent impact of biocontrol agents can be revealed for pest control when associated entomopathogenic fungi (EPFs) negatively affect the natural enemies. In this assay, impacts of Beauvaria bassiana (Balsamo) Vuillemin, and Metarhizium anisopliae (Metschnikoff) Sorokin were studied for their compatibility or side effects on life table parameters of an important generalist predator, Coccinella septempunctata L. The results indicated non-significant impacts of both EPFs on life table parameters of C. septempunctata. The development time (egg-adult) was not significantly different in control (69.79 days) and EPFs treated C. septempunctata (69.35–80.07 days). Both fungi did not induce any significant changes in the fecundity, adult pre-oviposition period (APOP), total preoviposition period (TPOP), and mean generation time (T) as compared to control treatment. Similarly, no difference in fecundity rate of C. septempunctata was observed after EPFs treatment (287.7–288.5) compared to control (290.0). The highest net reproductive rate (R0) occurred in control (87.05 offspring individual−1) and M. anisopliae (86.31 offspring individual−1) as compared to B. bassiana treated beetles (76.97 offspring individual−1). The age-specific fecundity curves indicated that the C. septempunctata had a similar fecundity rate in both EPFs treatments and control. This study demonstrates no significant side effects of B. bassiana and M. anispoliae on the performance and biology of C. septempunctata. Considering the compatibility of both EPFs with C. septempunctata, their combinations can be recommended in various integrated pest management programs.

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Effect of induced resistance in bean plants on Tetranychus urticae life table parameters

Systematic and Applied Acarology ◽

10.11158/saa.23.8.12 ◽

2018 ◽

Vol 23 (8) ◽

pp. 1627

Author(s):

Atefeh Dahmardeh ◽

Malihe Latifi ◽

Rohollah Saberi Riseh

Keyword(s):

Life Table ◽

Tetranychus Urticae ◽

Intrinsic Rate ◽

Reproductive Rate ◽

Intrinsic Rate Of Increase ◽

Life Table Parameters ◽

Acid Complex ◽

Net Reproductive Rate ◽

Bean Plants ◽

Rate Of Increase

In this study the effects of soil application of potassium phosphite, amino acid complex, and biolog siderophoric on the life table parameters of Tetranychus urticae have been investigated on bean plants, under laboratory conditions. The results revealed significant differences in the total developmental times, oviposition periods, and fecundity of T. urticae among the treatments. The shortest total developmental time and longevity was observed in biolog siderophoric treatment. The intrinsic rate of increase, the net reproductive rate, the finite rate of increase and the mean generation times of T. urticae were remarkably different among the treatments and lower than in the control. The lowest values of these parameters were observed in the biolog siderophoric treatment, which suggests that this inducer could be employed toward a sustainable management of T. urticae.

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

ISRN Entomology ◽

10.1155/2013/281476 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 3

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.

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Biology and life table parameters of Metaphycus marensis Chirinos & Kondo, 2019, an encyrtid parasitoid of guava cottony scale in Venezuela

Journal of Entomological and Acarological Research ◽

10.4081/jear.2020.8810 ◽

2020 ◽

Vol 52 (1) ◽

Author(s):

D.T. Chirinos ◽

R. Castro ◽

J. Castro ◽

I. Perez-Almeida ◽

T. Kondo

Keyword(s):

Life Cycle ◽

Life Table ◽

Generation Time ◽

Field Experiments ◽

Biological Control Agent ◽

Reproductive Rate ◽

Natural Increase ◽

Type I ◽

Life Table Parameters ◽

Net Reproductive Rate

The guava cottony scale, Capulinia linarosae (Hemiptera: Eriococcidae) is an important pest of guava, Psidium guajava, in Venezuela and northern Colombia. Metaphycus marensis (Hymenoptera: Encyrtidae) is a new primary parasitoid species recently described associated with this pest. Studies were conducted on oogenesis, life cycle, survival, daily fecundity and life table parameters of Metaphycus marensis Chirinos & Kondo (Hymenoptera: Encyrtidae): intrinsic rate of natural increase (rm), generation time (T) and net reproductive rate (Ro). Females of M. marensis are synovigenic and this parasitoid goes through four larval instars and completes its life cycle in about 12.7 days. Survival was of type I, where mortality was initially detected by encapsulation of eggs and larvae. Metaphycus marensis was able to multiply its population 28.7 times (Ro) with rm of 0.242 in 13.9 days (T). The short generation time of the parasitoid in relation to its eriococcid host could represent a desirable attribute as a natural enemy. However, the low fecundity and the encapsulation by the host must be analyzed through field experiments in order to evaluate its effectiveness as a biological control agent for C. linarosae.

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Life Table Parameters of the Zoophytophagous Predator Brontocoris tabidus (Heteroptera: Pentatomidae) on Introduced and Native Plants

Journal of Economic Entomology ◽

10.1093/jee/toz086 ◽

2019 ◽

Vol 112 (4) ◽

pp. 1760-1764

Author(s):

Rômulo Sátiro de Medeiros ◽

Germano Lopes Vinha ◽

José Cola Zanuncio ◽

Carlos Frederico Wilcken ◽

Claubert Wagner Guimarães de Menezes ◽

...

Keyword(s):

Life Table ◽

Population Growth Rate ◽

Native Plants ◽

Psidium Guajava ◽

Reproductive Rate ◽

Life Table Parameters ◽

Net Reproductive Rate ◽

Heteroptera Pentatomidae ◽

Eucalyptus Cloeziana ◽

Population Maintenance

Abstract Brontocoris tabidus Signoret (Heteroptera: Pentatomidae) is a zoophytophagous predator of lepidopteran defoliators of eucalyptus in Brazil. This predator complements its diet with plants, which is fundamental for its population maintenance. The objective was to evaluate the B. tabidus development, reproduction, and life table parameters in the field on Eucalyptus cloeziana F. Muell. (T1), Psidium guajava Linn (Myrtales: Myrtaceae) (T2), or without plants (T3). The parameters estimated were: net reproductive rate (Ro); generation duration (DG); time for the population to double in size (TD); intrinsic population growth rate (rm), survival rate (lX), specific fertility (mx), life expectancy (ex), and mortality risk (qx). Ro, DG, TD, and rm were higher in the T1 and T2 than in T3. Plant presence favored the lx, mx, and qx. Ex values were 36.1 and 56.9 in the T3 and T1, respectively. The B. tabidus fertility, longevity, and life table parameters improvement on E. cloeziana and P. guajava plants are due to the water and nutrients obtained from them. B. tabidus can be reared with Tenebrio molitor Linnaeus (Coleoptara: Tenebrionidae) pupae on E. cloeziana or P. guajava plants in the field.

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Effects of delayed mating on the reproductive biology of the vine mealybug, Planococcus ficus (Hemiptera: Pseudococcidae)

Bulletin of Entomological Research ◽

10.1017/s000748531700075x ◽

2017 ◽

Vol 108 (2) ◽

pp. 263-270 ◽

Cited By ~ 9

Author(s):

A. Lentini ◽

A. Mura ◽

E. Muscas ◽

M.T. Nuvoli ◽

A. Cocco

Keyword(s):

Population Growth ◽

Life Table ◽

Growth Rates ◽

Oviposition Period ◽

Population Doubling ◽

Population Doubling Time ◽

Life Table Parameters ◽

Planococcus Ficus ◽

Population Growth Rates ◽

Vine Mealybug

AbstractThe effect of increasing mating delay on the reproductive performance and population growth rates of the vine mealybug, Planococcus ficus (Signoret) (Hemiptera: Pseudococcidae), was investigated under laboratory conditions. Virgin females were mated at 1, 3, 5, 7, 14, 21 and 28 days after emergence and reproductive and life table parameters were estimated. The pre-oviposition period (number of days between mating and the onset of oviposition) significantly decreased in females mated within 7 days, whereas females mated at older ages showed equivalent pre-oviposition periods (<4 days). The length of the oviposition period did not vary with increasing age at mating. Female longevity significantly increased in females mated at 21 and 28 days, as a consequence of a longer pre-reproductive period. Fecundity and sex ratio were not affected by the female age at mating, whereas fertility was higher in mealybugs mated at older ages. Additional field observations highlighted that young and old virgin females were equally able to attract males, as both mated on the same day as the field release. Mating delay also affected the life table parameters of P. ficus, as the intrinsic and finite rates of increase did not differ in mealybugs mated within 7 days and significantly decreased in females mated at older ages. The mean generation time and the population doubling time were overall similar in females mated at 1–7 days, and increased significantly in females that experienced longer mating delays. In terms of the mating disruption control of P. ficus, our findings indicate that this method would be effective if mating is delayed >7 days, as shorter delays in mating did not reduce the population growth rates.

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Biology and fertility life table of Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) in sugarcane

Scientia Agricola ◽

10.1590/s0103-90162006000400001 ◽

2006 ◽

Vol 63 (4) ◽

pp. 317-320 ◽

Cited By ~ 18

Author(s):

José Francisco Garcia ◽

Paulo Sérgio Machado Botelho ◽

José Roberto Postali Parra

Keyword(s):

Life Cycle ◽

Life Table ◽

Reproductive Rate ◽

Oviposition Period ◽

Finite Rate ◽

Net Reproductive Rate ◽

Male And Female ◽

Rate Of Increase ◽

Important Pest

Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) is the most important pest of sugarcane harvested without the use of fire to burn leaf trash. Its biology was studied for three generations in order to obtain basic information about its life cycle. A fertility life table was used to evaluate the quality of laboratory-reared insects. Data were obtained at a temperature of 25 ± 1ºC, RH of 70 ± 10%, and a 14-hour photophase. The incubation period lasted 21 days with a viability of 81%; the nymph stage had a duration of 37 days, with a 94% viability; the male and female longevities were 18 and 23 days, respectively, with a pre-oviposition period of 5 days and an oviposition period of 16 days, with a fecundity of 342 eggs, with a life-cycle (egg-adult) of 60 days. A net reproductive rate (Ro) of 131 females produced per female per generation was measured, with a finite rate of increase (lambda) of 1.085. The fertility life table proved to be adequate to be evaluate the quality of laboratory-reared M. fimbriolata populations.

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Two-sex life table and host preference studies of Bactrocera dorsalis Hendel (Diptera: Tephritidae)

ENTOMON ◽

10.33307/entomon.v46i1.582 ◽

2021 ◽

Vol 46 (1) ◽

pp. 11-24

Author(s):

Nayan Roy

Keyword(s):

Life Table ◽

Host Preference ◽

Reproductive Rate ◽

Natural Increase ◽

Bactrocera Dorsalis ◽

Invasive Pest ◽

Population Doubling ◽

Population Doubling Time ◽

Potential Fecundity ◽

Net Reproductive Rate

Oriental fruit fly, Bactrocera dorsalis, is a serious invasive pest in tropical and subtropical countries. The stage-specific two-sex pooled life table of B. dorsalis on four different fruits (guava, water apple, rose apple and mango) were studied during 2018-2020. The life table showed that the survivorship of B. dorsalis falls in Type III with about 41.394-33.827per cent of the eggs successfully reached adult stage. The highest mortality recorded was in the egg and adult emergence stages with kx of 0.045-0.113 and 0.032-0.192, respectively. The average potential fecundity (Pf) was 223-362 eggs female-1. The intrinsic rate of natural increase (rm) was 0.021-0.035 female-1 day-1 with mean generation time (Tc) of 194.058-148.710 days. The net reproductive rate (Ro) was 61.504-176.006 female offspring per female and the population doubling time (DT) was within 32.719-19.946 days. The population dynamics of B. dorsalis were significantly influenced by the host fruits due to their respective phytoconstituents in terms of host suitability or susceptibility (guava> water apple> rose apple> mango). Host preference of B. dorsalis was in the order of guava> water apple>rose apple.

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BIOLOGÍA DEL ÁFIDO NEGRO (Aphis craccivora: APHIDIDAE) SOBRE FRÍJOL CAUPI (Vigna unguiculata, FABACEAE)

Acta Biológica Colombiana ◽

10.15446/abc.v20n3.43064 ◽

2015 ◽

Vol 20 (3) ◽

pp. 93-97 ◽

Cited By ~ 3

Author(s):

Nataly DE LA PAVA S ◽

Paula Andrea SEPÚLVEDA-CANO

Keyword(s):

Vigna Unguiculata ◽

Doubling Time ◽

Reproductive Rate ◽

Reproductive Period ◽

Aphis Craccivora ◽

Population Doubling ◽

Population Doubling Time ◽

Net Reproductive Rate ◽

Average Temperature ◽

Rate Of Increase

Este trabajo describe los parámetros biológicos y poblacionales del pulgón negro, Aphis craccivora Koch, sobre fríjol caupí (Vigna unguiculata (L. Walp.)), bajo condiciones de laboratorio. Los insectos se criaron sobre plántulas individualizadas a una temperatura promedio de 28 °C, humedad relativa de 70 % y fotoperiodo de 12 horas. Los parámetros medidos fueron periodo ninfal, fecundidad, supervivencia, periodo pre-reproductivo y aspectos relativos a la tasa de crecimiento del áfido. La tasa reproductiva neta R (0) fue 66,00, la tasa intrínseca de crecimiento del áfido (rm) fue 0,51, el tiempo de duplicación de la población (TD) fue 2,3. Se analizaron las curvas de supervivencia (lx), fecundidad (mx), la duración del período ninfal y reproductivo del áfido. Los resultados difieren de los realizados en otras variedades de fríjol caupí, evidenciándose la susceptibilidad de la variedad criolla usada por los agricultores en la costa Caribe colombiana.Biology of Black Aphid (Aphis Craccivora: Aphididae) on Cowpea (Vigna Unguiculata, Fabaceae) This research describes the population and biological parameters of the black aphid (Aphis craccivora Koch) on cowpea bean (Vigna unguiculata (L. Walp.)), under laboratory conditions. The insects were raised on individualized seedlings in an average temperature of 28 °C, at 70 % relative humidity during a photoperiod of 12 hours. The parameters measured were the nymphal period, fecundity, longevity, pre-reproductive period and aspects of aphid growth rate. The net reproductive rate R (0) was 66.00, the intrinsic g rate of increase of the aphid (rm) was 0.51, and the population doubling time (TD) was 2.3. Survival curves (lx), fecundity (mx), the duration of nymphal and the reproductive period of the aphid were analyzed. The results differ from those found in other varieties of cowpea beans, demonstrating the susceptibility of the native variety used by farmers in the Colombian Caribbean coast.

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THE SUBLETHAL EFFECTS OF SELECTED INSECTICIDES ON LIFE TABLE PARAMETERS OF PANONYCHUS CITRI (ACARI: TETRANYCHIDAE)

The Canadian Entomologist ◽

10.4039/ent1161033-7 ◽

1984 ◽

Vol 116 (7) ◽

pp. 1033-1040 ◽

Cited By ~ 34

Author(s):

Vincent P. Jones ◽

Michael P. Parrella

Keyword(s):

Life Table ◽

Sublethal Effects ◽

Reproductive Rate ◽

Citrus Limon ◽

Life Table Parameters ◽

Panonychus Citri ◽

Net Reproductive Rate ◽

Citrus Red Mite ◽

Rough Lemon

AbstractPopulations of the citrus red mite, Panonychus citri (McGregor), reared on “rough lemon” seedlings (Citrus limon (L.) Burm.) in a greenhouse and treated with malathion or permethrin were significantly higher than those on untreated seedlings. Significant increases were demonstrated in age-specific fecundity (mx), mortality corrected mx (lx mx), and net reproductive rate (Ro) values for mites reared in the laboratory on leaves treated with malathion or permethrin when compared with those reared on untreated leaves. Mites reared on oxamyl-treated leaves exhibited significant reductions in age-specific survivorship (% lx), mx, lxmx, and Ro values compared with those reared on untreated leaves. The importance of reproductive stimulation in relation to other causes of pest resurgence is discussed.

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