Supplementation of natural prey with pollen grains exerts an influence on the life table parameters of Neoseiulus californicus

2020 ◽  
Vol 110 (4) ◽  
pp. 535-541
Author(s):  
Afsaneh Soltaniyan ◽  
Katayoon Kheradmand ◽  
Yaghoub Fathipour ◽  
Davoud Shirdel
Keyword(s):  
Life Span ◽  
Pollen Grains ◽  
Control Program ◽  
Developmental Time ◽  
Neoseiulus Californicus ◽  
Generalist Predators ◽  
Rate Of Increase ◽  
Reproduction Period ◽  
Reproductive Rates ◽  
Total Life

AbstractBetter performance of generalist predators, as well as an increase in their density, may be an incentive factor in the ability of the predators to exploit more than one food item or mixed diets. In this study, the effects of four pollen grains (cedar, pear, apricot, and pistachio) when provided to Neoseiulus californicus in mixed diets with prey, Tetranychus urticae, were evaluated. The result indicated that the fastest female developmental time was observed on pistachio pollen + T. urticae, together with apricot pollen + T. urticae. Females reared on the mixed diet comprising pistachio pollen reflected the longest total life span duration, while the shortest total life span was observed in those on the diet that included pear pollen. Furthermore, the lowest fecundity, as well as the shortest reproduction period, was determined on the diets that included pear pollen, while the highest fecundity and the longest reproduction period were observed in pistachio pollen + T. urticae. In addition, the intrinsic (r) and finite rate of increase (λ), net (R0) and gross (GRR) reproductive rates were highest in pistachio pollen + T. urticae. These findings have important implications for developing a comprehensive biological control program of T. urticae, which will be discussed.

Havasi, M., Kheradmand, K., Mosallanejad, H. & Fathipour, Y. (2020) Life history traits and demographic parameters of Neoseiulus californicus McGregor (Acari: Phytoseiidae) treated with the Biomite®. Systematic & Applied Acarology, 25(1), 125–138.

2020 ◽  
Vol 25 (3) ◽  
pp. 411
Author(s):  
Mohammadreza Havasi ◽  
Katayoon Kheradmand ◽  
Hadi Mosallanejad ◽  
Yaghoub Fathipour
Keyword(s):  
Life History ◽  
Life Span ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Life Table ◽  
Reproductive Rate ◽  
Neoseiulus Californicus ◽  
Intrinsic Rate Of Increase ◽  
Rate Of Increase ◽  
Total Life

Knowledge of the effects of pesticides on biological control agents is necessary for the successful implementation of integrated pest management programs. Laboratory bioassays were conducted to evaluate the effects of Biomite®, a natural acaricide, on the life table parameters of Neoseiulus californicus McGregor (Acari: Phytoseiidae), as one of the most important natural enemies of Tetranychus urticae Koch (Acari: Tetranychidae) under laboratory conditions at 25 ± 2°C, 65 ± 5% RH and a photoperiod of 16:8 (L:D) h. The raw data were analyzed based on the two-sex life table theory. Biomite® concentrations LC10 and LC20 gradually and significantly reduced the longevity and total life span of both sexes, as well as total fecundity. Besides, concentration LC20 significantly reduced the gross reproductive rate (GRR) and the net reproductive rate (R0). However, the intrinsic rate of increase (r) and the finite rate of increase (λ) were not significantly affected. Thereby, due to an unfavorable shortened in life history characters of N. californicus such as total life span, reproductive periods and biological parameters (such as R0 and GRR), as a consequence of Biomite® treatment, it can be concluded that this acaricide should not be used with N. californicus in integrated pest management programs.

Life history traits and demographic parameters of Neoseiulus californicus McGregor (Acari: Phytoseiidae) treated with the Biomite® 

2020 ◽  
Vol 25 (1) ◽  
pp. 125-138
Author(s):  
Mohammadreza Havasi ◽  
Katayoon Kheradmand ◽  
Hadi Mosallanejad ◽  
Yaghoub Fathipour
Keyword(s):  
Life History ◽  
Life Span ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Life Table ◽  
Reproductive Rate ◽  
Neoseiulus Californicus ◽  
Intrinsic Rate Of Increase ◽  
Rate Of Increase ◽  
Total Life

Knowledge of the effects of pesticides on biological control agents is necessary for the successful implementation of integrated pest management programs. Laboratory bioassays were conducted to evaluate the effects of Biomite®, a natural acaricide, on the life table parameters of Neoseiulus californicus McGregor (Acari: Phytoseiidae), as one of the most important natural enemies of Tetranychus urticae Koch (Acari: Tetranychidae) under laboratory conditions at 25 ± 2°C, 65 ± 5% RH and a photoperiod of 16:8 (L:D) h. The raw data were analyzed based on the two-sex life table theory. Biomite® concentrations LC10 and LC20 gradually and significantly reduced the longevity and total life span of both sexes, as well as total fecundity. Besides, concentration LC20 significantly reduced the gross reproductive rate (GRR) and the net reproductive rate (R0). However, the intrinsic rate of increase (r) and the finite rate of increase (λ) were not significantly affected. Thereby, due to an unfavorable shortened in life history characters of N. californicus such as total life span, reproductive periods and biological parameters (such as R0 and GRR), as a consequence of Biomite® treatment, it can be concluded that this acaricide should not be used with N. californicus in integrated pest management programs.

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 Life history of Neoseiulus californicus (McGregor, 1954) (Acari: Phytoseiidae) fed with castor bean (Ricinus communisL.) pollen in laboratory conditions

2014 ◽  
Vol 74 (3) ◽  
pp. 691-697 ◽  
Author(s):  
PP Marafeli ◽  
PR Reis ◽  
EC. da Silveira ◽  
GC Souza-Pimentel ◽  
MA. de Toledo
Keyword(s):  
Life History ◽  
Castor Bean ◽  
Ricinus Communis ◽  
Intrinsic Rate ◽  
Predatory Mite ◽  
Neoseiulus Californicus ◽  
Intrinsic Rate Of Increase ◽  
Ricinus Communis L ◽  
Rate Of Increase ◽  
History Of

The predatory mite, Neoseiulus californicus(McGregor, 1954) (Acari: Phytoseiidae) is one of the principal natural enemies of tetranychid mites in several countries, promoting efficient control of those mites in several food and ornamental crops. Pest attacks such as that of the spider mite, Tetranychus urticaeKoch, 1836 (Acari: Tetranychidae), is one of the problems faced by farmers, especially in the greenhouse, due to the difficulty of its control with the use of chemicals because of the development of fast resistance making it hard to control it. The objective of this work was to study the life history of the predatory mite N. californicus as a contribution to its mass laboratory rearing, having castor bean plant [Ricinus communis L. (Euphorbiaceae)] pollen as food, for its subsequent use as a natural enemy of T. urticae on a cultivation of greenhouse rosebushes. The studies were carried out in the laboratory, at 25 ± 2°C of temperature, 70 ± 10% RH and a 14 hour photophase. The biological aspects and the fertility life table were appraised. Longevity of 32.9 days was verified for adult females and 40.4 days for males. The intrinsic rate of increase (rm) was 0.2 and the mean generation time (T) was 17.2 days. The population doubled every 4.1 days. The results obtained were similar to those in which the predatory mite N. californicus fed on T. urticae.

Reproductive Uncertainty and the Evolution of Iteroparity: Why Don't Flatfish Put All Their Eggs in One Basket?

1981 ◽  
Vol 38 (8) ◽  
pp. 968-977 ◽  
Author(s):  
Derek A. Roff
Keyword(s):  
Reproductive Success ◽  
Life Span ◽  
Intrinsic Rate ◽  
Intrinsic Rate Of Increase ◽  
Rate Of Increase ◽  
Age Of Maturity ◽  
Reproductive Life ◽  
Reproductive Life Span ◽  
Engraulis Ringens ◽  
Using Data

Murphy's hypothesis that variation in reproductive life span is an adaptive response to variation in the predictability of reproductive success is examined. Murphy's contention that this hypothesis explains the variation in reproductive life span within the clupeids is reexamined incorporating further data on the Peruvian anchovy (Engraulis ringens). A nonsignificant correlation is now obtained between reproductive life span and brood strength variation; thus, the hypothesis is called into question. An alternative explanation is presented that considers the interaction between life history parameters: because it is necessary for the intrinsic rate of increase to exceed zero, variation in one parameter must be associated with variation in at least one other parameter. In the clupeids it is noted that the age of maturity and reproductive life span vary in concert and it is suggested that this provides an explanation of variation in reproductive life span. These two hypotheses are examined using data on the family Pleuronectidae, the flatfish. No correlation exists between reproductive life span and the degree of fluctuation in brood strength but there is a significant correlation between reproductive life span and age of maturity. It is concluded that variation in reproductive life span within the flatfish group is not a response to variation in reproductive success but rather a correlate of variation in age of maturity.Key words: flatfish, Pleuronectidae, iteroparity, natural selection, reproduction, clupeids

scholarly journals Biology of pink stem borer, Sesamia inferens (Walker) on maize, Zea mays

2017 ◽  
Vol 9 (4) ◽  
pp. 1994-2003
Author(s):  
Hemant Sharma ◽  
Maha Singh Jaglan ◽  
S. S. Yadav
Keyword(s):  
Life Span ◽  
First Generation ◽  
Insect Pest ◽  
Management Strategies ◽  
Stem Borer ◽  
Adult Longevity ◽  
Research Station ◽  
Sesamia Inferens ◽  
Two Generations ◽  
Total Life

Biology of pink stem borer, Sesamia inferens (Walker) (Lepidoptera: Noctuidae) was conducted during 2015-16 in laboratories of CCS Haryana Agricultural University, Regional Research Station, Karnal on HQPM 1 (hybrid) and HKI 1128 (inbred) for two generations at room temperature. Results on biology of S. inferens in the first generation revealed that incubation period varied from 10-14 days on HQPM 1 and 11-15 days on HKI 1128. The larval duration lasted for 21-37 days on HQPM 1 and 24-39 days on HKI 1128. The adult longevity of male and female ranged from 6-7 days and 7-8 days on HQPM 1 and 5-7 days and 6-7 days on HKI 1128, respectively. The total life span ranged from 63-72 days for female and 45-58 days for male on HQPM 1 and 65-74 days for female and 49-62 days for male on HKI 1128, respectively in the first generation. The total life span in second generation ranged 94-107 days for female and 83-96 days for male on HQPM 1 and 98-112 days for female and 86-101 days for male on HKI 1128. The biology of an insect pest is a condition precedent to find out its management strategies. The biology of S. inferens on maize has not yet been studied in north western part of the country. Having regards to the fact that no systematic work on this aspect has been carried out, studies were conducted on biology of this pest for developing efficient pest management strategies.

EFFECTS OF CONSTANT TEMPERATURE, RELATIVE HUMIDITY, AND SIMULATED RAINFALL ON DEVELOPMENT AND SURVIVAL OF THE SPRUCE SPIDER MITE (OLIGONYCHUS UNUNGUIS)

1983 ◽  
Vol 115 (1) ◽  
pp. 93-105 ◽  
Author(s):  
John V. Boyne ◽  
Fred P. Hain
Keyword(s):  
Relative Humidity ◽  
Intrinsic Rate ◽  
Developmental Time ◽  
Reproductive Rate ◽  
Natural Increase ◽  
Simulated Rainfall ◽  
Net Reproductive Rate ◽  
Fraser Fir ◽  
Oligonychus Ununguis ◽  
Rate Of Increase

AbstractExperiments were conducted on Fraser fir, Abies fraseri (Pursh) Poir, seedlings or cut terminals. Results indicate that Oligonychus ununguis (Jacobi) responds most favorably to temperatures approximating 26 °C and to relative humidity levels approaching 50 to 60%. Developmental time, time to 50% mortality, net reproductive rate, mean generation time, intrinsic rate of natural increase, finite rate of increase, and days for populations to double were computed for each temperature and relative humidity regime. Simulated rainfall severely limits population density on Fraser fir seedlings.

Demographic, dispersal, predation and genetic data reveal the potential vulnerability of an endangered rainforest shrub, Triunia robusta (Proteaceae)

2017 ◽  
Vol 65 (3) ◽  
pp. 270 ◽  
Author(s):  
Yoko Shimizu-Kimura ◽  
Scott Burnett ◽  
Alison Shapcott
Keyword(s):  
Gene Flow ◽  
Life Span ◽  
Demographic Data ◽  
Genetic Data ◽  
Seedling Mortality ◽  
Isolated Populations ◽  
Predation Mortality ◽  
Dispersal Vectors ◽  
Limited Gene Flow ◽  
Reproductive Rates

We investigated the population ecology of Triunia robusta (C.T. White) Foreman, an endemic rainforest shrub of south-east Queensland, Australia. Two-time demographic data from 1999 and 2010 were used to estimate the species life span and changes in demographic factors over the 11 year period. The potential dispersal vectors and their activities were monitored, and the effects of predation on seed and seedling mortality were quantified. Published genetic data was used to assess the gene flow distance in years. On average, T. robusta has a life span of 103 years, with a generation time of 44 years. Larger populations (>200) increased in size since 1999, whereas smaller populations retained the same or slightly reduced numbers. Small, isolated populations in the northern distribution range showed substantially lower reproductive rates. Local rodents and marsupials were considered responsible for the majority of observed secondary seed dispersal (<10.3 m) and predation activities. Post-predation mortality was high (82%), with only 12% surviving to become seedlings. The empirical evidence of short-distance dispersal, limited gene flow, high post-predation mortality rates and relatively low reproductive rates, combined with potential absence of primary dispersers suggests that critically small and isolated populations may be highly vulnerable.

The effects of Spiromesifen on life history traits and demographic parameters of predatory mite Neoseiulus californicus (Acari: Phytoseiidae) and its prey Tetranychus urticae Koch (Acari: Tetranychidae)

2019 ◽  
Vol 24 (8) ◽  
pp. 1512-1525
Author(s):  
Niloufar Sangak Sani Bozhgani1 ◽  
Katayoon Kheradmand ◽  
Aliasghar Talebi
Keyword(s):  
Life History ◽  
Tetranychus Urticae ◽  
Life History Traits ◽  
Sublethal Effects ◽  
Predatory Mite ◽  
Neoseiulus Californicus ◽  
Intrinsic Rate Of Increase ◽  
Adult Longevity ◽  
Demographic Parameters ◽  
Rate Of Increase

Estimating sublethal effects of acaricides on phytoseiid mites and their prey as a reliable approach in predicting the acaricides impacts is mandatory for IPM programs. The aim of this study was to evaluate the effects of spiromesifen on life history traits and demographic parameters of the offspring of Neoseiulus californicus and Tetranychus urticae under laboratory conditions [25 ± 2ºC, 70 ± 5% RH and 16:8 (L:D) h]. The experiments were conducted based on the leaf-dip technique. The crude data were analysed based on age-stage, two-sex life table analysis. The pre-adult and adult longevity of both sexes significantly reduced for N. califonicus and T. urticae with the concentration enhancing from LC20 to LC35. In addition, the oviposition period for both species significantly decreased as a consequence of treatment with LC25 and LC35 of spiromesifen. The minimal values of the total fecundity for N. califonicus and T. urticae were 16.58 and 19.35 (offspring/individual), respectively, which was related to LC35 concentration. Further, the lowest values of R0 and GRR of N. califonicus and its prey were 48.88 and 31.14 (offspring/individual) in LC35, respectively. However, the intrinsic rate of increase (r) and finite rate of increase (λ) were not significantly influenced by sublethal concentration in N. californicus while the r and λ were significantly reduced in T. urticae treated by LC20, LC25 and LC35. Therefore, spiromesifen could profoundly decrease the population growth rate of T. urticae but can not be considered as a compatible acaricide with N. califonicus because of its negative effect on the longevity, total lifespan, and reproductive periods and should not be used with this predatory mite in integrated pest management programs.

scholarly journals A life table analysis to evaluate biological control of banks grass mite using the predatory mite, Galendromus flumenis (Acari: Phytoseiidae)

2017 ◽  
Vol 22 (1) ◽  
pp. 7 ◽  
Author(s):  
Fatemeh Ganjisaffar ◽  
Thomas M. Perring
Keyword(s):  
Biological Control ◽  
Growth Parameters ◽  
Intrinsic Rate ◽  
Developmental Time ◽  
Predatory Mite ◽  
Reproductive Rate ◽  
Intrinsic Rate Of Increase ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Banks Grass Mite

The predatory mite, Galendromus flumenis (Chant) (Acari: Phytoseiidae), has shown promising traits for biological control of Banks grass mite, the major pest of date palms in California. In the present study, reproduction and population growth parameters of G. flumenis on Banks grass mite eggs were studied at 34ºC, 50±10% RH and a photoperiod of 16: 8 (L: D) hours. 100 percent of eggs hatched and 63.5 percent of the emerged larvae survived to adulthood. The total immature developmental time was 5.7 and 5.5 days for females and males, respectively. The sex ratio of G. flumenis was 0.70 (females/ females+ males). Mated females laid on average 1.6 eggs per day and 19.9 eggs during their mean ovipositional period of 12.5 days. The net reproductive rate (R0) was 11.5 females/ female/ generation, the intrinsic rate of increase (rm) was 0.200 females/ female/ day, the finite rate of increase (λ) was 1.222 population multiplication/ day, the mean generation time (T) was 12.2 days, and the doubling time (DT) was 3.5 days. The lower rm value of G. flumenis than that of its prey (0.24–0.48) explains why Banks grass mite escapes control by G. flumenis in field. These results suggest that augmentative release of this predator would offset the lower rm of the predator, thereby contributing to the control of Banks grass mite. Combined with the benefit of early releases determined in companion studies, future field studies with G. flumenis are being planned.

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