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

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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Demographic analysis of sublethal effects of spiromesifen on Neoseiulus californicus (Acari: Phytoseiidae)

Acarologia ◽

10.24349/acarologia/20174173 ◽

2017 ◽

Vol 57 (3) ◽

pp. 571-580

Author(s):

Maryam Ghadim Mollaloo ◽

Katayoon Kheradmand ◽

Reza Sadeghi ◽

Ali Aasghar Talebi

Keyword(s):

Life Table ◽

Sublethal Effects ◽

Sublethal Effect ◽

Reproductive Rate ◽

Neoseiulus Californicus ◽

Control Treatment ◽

Intrinsic Rate Of Increase ◽

Life Table Parameters ◽

Net Reproductive Rate ◽

Rate Of Increase

The sublethal effect of spiromesifen on life table parameters of Neoseiulus californicus McGregor (Acari: Phytoseiidae) was evaluated under laboratory conditions 25±1 °C, 65±5% RH and 16:8 (L:D) h. To take both sexes and the variable developmental rate among individuals into consideration, the raw data were analyzed based on the age stage, two sex life table. The estimated values of LC5, LC10 and LC15 for N. californicus are found to be 5.834, 9.529 and 13.267 ppm, respectively. The total preoviposition period of N. californicus treated with sublethal concentrations of spiromesifen was not significantly longer than for the control treatment. The minimum total fecundity was recorded for the LC15 concentration of spiromesifen (19.37 eggs/female) that was significantly different to the LC5 and control treatments. Compared with the control, the intrinsic rate of increase (r), finite rate of increase (λ), net reproductive rate (R0) and gross reproduction rates (GRR) of mites treated by the dose of the LC15 concentration, decreased significantly but the mean generation time (T) was not affected by this sublethal concentration. Our results indicated that increasing concentrations of spiromesifen had significant negative effects on life table parameters of N. californicus.These quantities should not be used in combination with N. californicus in integrated pest management programs in order to obtain optimal of biological control conclusions.

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

Insects ◽

10.3390/insects12070629 ◽

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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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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Biology, Predatory Potential, Life Table, and Field Evaluation of Propylea dissecta (Coleoptera: Coccinellidae), Against Lipaphis erysimi (Hemiptera: Aphididae) on Broccoli

Journal of Economic Entomology ◽

10.1093/jee/toz272 ◽

2019 ◽

Vol 113 (1) ◽

pp. 88-97 ◽

Cited By ~ 3

Author(s):

Thangavel Boopathi ◽

Soibam Basanta Singh ◽

Sudip Kumar Dutta ◽

Vishambhar Dayal ◽

Akoijam Ratankumar Singh ◽

...

Keyword(s):

Life Table ◽

Coccinella Septempunctata ◽

Field Evaluation ◽

Reproductive Rate ◽

Lipaphis Erysimi ◽

Adult Males ◽

Mustard Aphid ◽

Net Reproductive Rate ◽

Larval Stages ◽

Propylea Dissecta

Abstract Propylea dissecta (Mulsant) (Coleoptera: Coccinellidae) is one of the most promising ladybird beetle against many sucking pests. Predation rates, developmental biology, life table, and field assessment of this ladybird were examined against mustard aphid, Lipaphis erysimi (Kalt.) (Hemiptera: Aphididae), on broccoli. Data on the life history were collected at 23 ± 1°C and 70 ± 1% RH and were evaluated using the two-sex, age-stage life table. Results showed that the two-sex, age-stage life table-based net reproductive rate (R0) was 11.264 ± 6.197 offspring. The adult females lived longer (33.8 ± 2.356 d) than the adult males (32.2 ± 0.841 d). The fourth instar consumed most of L. erysimi (113.97 ± 5.76) compared to the other larval stages of the predator. Male (1,821) and female (2,673) consumed more aphids than larvae. The net consumption rate was 741.78 ± 89.91 aphids. Other aphidophagous predators such as Coccinella septempunctata L., Micraspis discolor (F.), Coccinella transversalis (F.), and syrphid (Diptera: Syrphidae) were also noted in broccoli. Our research showed that inoculative release of 150 or 200 adults per 1,000 m2 for two times on broccoli achieved a significant decrease in aphids L. erysimi and Brevicoryne brassicae L. (Hemiptera: Aphididae) (>95%). The release rate of 150 adults per 1,000 m2 for two times may, therefore, be recommended to manage the aphid population on broccoli.

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

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2014000100001 ◽

2014 ◽

Vol 49 (1) ◽

pp. 1-10 ◽

Cited By ~ 2

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.

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