Bionomics of Nodele calamondin Muma (Acarina: Cheyletidae) fed on Lepidoglyphus destructor (Schrank) (Acarina: Glycyphagidae) at two constant temperatures

1992 ◽  
Vol 70 (12) ◽  
pp. 2333-2337 ◽  
Author(s):  
Philip S. Barker
Keyword(s):  
Rate Ratio ◽  
Average Duration ◽  
Mite Species ◽  
Reproductive Rate ◽  
Male Offspring ◽  
Insect Larvae ◽  
Nymphal Stage ◽  
Net Reproductive Rate ◽  
Successive Generations ◽  
Small Insect

Nodele calamondin Muma is a predator of other mite species and of small insect larvae. Unmated females produced only male offspring (arrhenotoky), which subsequently mated with their mothers to produce female as well as male offspring. At 29.5 °C these females became adults an average of 47.3 days after the emergence of the mother. Males have one nymphal stage in their development and females have two nymphal stages. Males guarded the quiescent deutonymph females and mating took place as soon as the females emerged as adults. Unmated females lived more than twice as long as mated females and laid about 89% of the number of eggs laid by their mated sisters. The average duration of a generation was 62 days at 25 °C and 34 days at 29.5 °C. Net reproductive rate (ratio of female births in two successive generations) was 20 at 25 °C and 34 at 29.5 °C.

Bionomics of Cheyletus eruditus (Schrank) (Acarina: Cheyletidae), a predator of Lepidoglyphus destructor (Schrank) (Acarina: Glycyphagidae), at three constant temperatures

1991 ◽  
Vol 69 (9) ◽  
pp. 2321-2325 ◽  
Author(s):  
Philip S. Barker
Keyword(s):  
Adult Mortality ◽  
Predatory Mite ◽  
Reproductive Rate ◽  
Net Reproductive Rate ◽  
First Instar ◽  
Total Female ◽  
Reproductive Rates ◽  
Successive Generations ◽  
Cheyletus Eruditus ◽  
Cryptolestes Turcicus

The duration and mortality of immature stages of the predatory mite Cheyletus eruditus (Schrank) were examined at 14, 18.5, 22, and 25 °C and 76% RH. Life tables and schedules of female eggs laid by each female per day were made from records of daily oviposition and adult mortality. The net reproductive rate (ratio of total female births in two successive generations) of C. eruditus varies from 40.7 at 18.5 °C to 74.4 at 25 °C and brackets the net reproductive rates of the prey Lepidoglyphus destructor (Schrank). Mean generation time and finite rates of increase (multiplication per female each day) varied from 52.2 days and 1.073 at 18.5 °C to 24.2 days and 1.194 at 25 °C. Maximum longevity was 107, 67, and 56 days at 18.5, 22, and 25 °C, respectively. Cheyletus eruditus also consumed first-instar larvae of the rusty grain beetle, Cryptolestes ferrugineus (Stephens), and first- and second-instar larvae of the flour mill beetle, Cryptolestes turcicus (Grouvelle).

scholarly journals LIFE AND FERTILITY TABLES OF Pineus boerneri ANNAND (HEMIPTERA: ADELGIDAE) ON Pinus spp. (PINACEAE)

FLORESTA ◽  
2016 ◽  
Vol 46 (2) ◽  
pp. 251
Author(s):  
Josiane Teresinha Cardoso ◽  
Sonia Maria Noemberg Lazzari
Keyword(s):  
Intrinsic Rate ◽  
Pinus Elliottii ◽  
Reproductive Rate ◽  
Natural Increase ◽  
Reproductive Capacity ◽  
Nymphal Stage ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Significant Difference ◽  
Pinus Spp

Biological parameters of Pineus boerneri were evaluated in laboratory using seedlings of Pinus taeda and Pinus elliottii. The nymphs were observed along their development. The total life cycle was not significantly different on P. taeda and P. elliottii, being, respectively, 69 and 65 days. The same trend was observed for mean fecundity, being about 40 eggs/female on P. taeda and 53 on P. elliottii. However, when daily mean fecundity was considered, the difference was significant, being 1.3 eggs/female/day on P. taeda and 1.8 on P. elliottii. The nymphal mortality was greater on P. taeda (50%) than on P. elliottii (28%). These results reflected on life expectancy which was higher on P. elliottii for the nymphal stage, but for the adult stage there was no significant difference between both host plants. The intrinsic rate of natural increase and the finite rate of increase were similar, indicating that P. boerneri shows the same reproductive capacity on both hosts, despite the net reproductive rate being much greater on P. elliottii (23.8 eggs/female) than on P. taeda (15.4). The highest nymphal survival and reproductive rates on P. elliottii indicate that this host plant is more suitable for the development of P. boerneri.

scholarly journals Biological aspects of Aphis gossypii Glöver, 1877 (Hemiptera: Aphididae) on colored lint cotton cultivars

2013 ◽  
Vol 80 (3) ◽  
pp. 325-333 ◽  
Author(s):  
Lilian Roberta Batista Correa ◽  
Francisco Jorge Cividanes ◽  
Saulo Rene Damião Sala
Keyword(s):  
Aphis Gossypii ◽  
Reproductive Rate ◽  
Cotton Leaf ◽  
Climate Chamber ◽  
Nymphal Stage ◽  
Net Reproductive Rate ◽  
Aphis Gossypii Glover ◽  
Colored Cotton ◽  
Biological Aspects ◽  
Petri Dishes

This paper outlines the results of a study into the biological aspects of Aphis gossypii Glöver on colored cotton cultivars through the construction of life tables. In addition, we evaluate the influence of density of gossypol glands and trichomes of leaves on the biology of the aphid. Tests were conducted in a climate chamber at 25 ± 2°C, with relative humidity (RH) at 70 ± 10%, and a photophase of 12 hours, using the cultivars BRS Rubi, BRS Safira, and BRS Verde. Newly hatched nymphs were individually isolated in petri dishes containing leaf discs of cotton cultivars on a layer of water-agar (1%) of approximately 5 mm thick. An evaluation of the trichomes and gossypol gland densities of the cotton leaf plants was performed under a stereomicroscope, delimited to an area of 1 cm², and a count and identification of those on the surface was made. The feed substrates that were evaluated influenced the nymphal stage of A. gossypii. BRS Verde provided the shortest duration and BRS Safira was the longest during this phase. The cultivar BRS Verde, with the lowest density of trichomes, provided a large number of nymphs and led to a higher net reproductive rate (R0). Given these results, conclusions can be drawn that the colored cotton cultivars influence the duration of nymphal and adult stages of A. gossypii. The cultivar with a high density of trichomes on leaves (BRS Safira) adversely affects the fertility parameters of A. gossypii.

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.

Development of Cheyletus malaccensis (Acari: Cheyletidae) feeding on mite species found in commercial poultry systems: Megninia ginglymura (Acari: Analgidae) and Tyrophagus putrescentiae (Acari: Acaridae)

2016 ◽  
Vol 21 (10) ◽  
pp. 1604 ◽  
Author(s):  
Juliana Granich ◽  
Tamara Bianca Horn ◽  
Júlia Horn Körbes ◽  
Maicon Toldi ◽  
Guilherme Liberato Da Silva ◽  
...  
Keyword(s):  
Egg Production ◽  
Egg Quality ◽  
Control Strategies ◽  
Mite Species ◽  
Reproductive Rate ◽  
Tyrophagus Putrescentiae ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Commercial Poultry ◽  
Cheyletus Malaccensis

Intensive egg production affects the welfare of confined laying hens, which increases the risk of epidemics. Ectoparasitic hematophagous mites and saprophagous feather mites cause low productivity and decreased egg quality. This study aimed to compare the biology of Cheyletus malaccensis (Oudemans) (Prostigmata: Cheyletidae) feeding on the prey Megninia ginglymura (Mégnin) (Astigmata: Analgidae) and Tyrophagus putrescentiae (Schrank) (Astigmata: Acaridae) in order to support the potential use of this predator in biological control strategies in the poultry industry. The study started with 30 eggs of C. malaccensis, isolated in experimental units, which developed into their different stages while feeding on the feather mite M. ginglymura and the stored product mite T. putrescentiae at 25±1ºC, 80±5% relative humidity and 12-hour photoperiod. Immature stages were evaluated three times a day and the adult stage once a day. Adult females were unmated. Cheyletus malaccensis feeding on M. ginglymura resulted in a higher fertility rate, with 310.7±45.8 eggs/female, than with T. putrescentiae as prey, with 32.7±4.5 eggs/female. Furthermore, the oviposition period was higher feeding on M. ginglymura, 53.0±6.3 days, than on T. putrescentiae, 12.6±1.9 days. The net reproductive rate (Ro), the innate capacity for increase (rm), the mean generation time (T) and the finite rate of increase (λ) were higher for the generation fed on M. ginglymura. Cheyletus malaccensis is a likely natural enemy of M. ginglymura, and it is able to develop and reproduce while feeding exclusively on it. 

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.

Plant Resistance in Some Modern Soybean Varieties May Favor Population Growth and Modify the Stylet Penetration of Bemisia tabaci (Hemiptera: Aleyrodidae)

2021 ◽  
Author(s):  
Mauricélia F Almeida ◽  
Clébson S Tavares ◽  
Euires O Araújo ◽  
Marcelo C Picanço ◽  
Eugênio E Oliveira ◽  
...  
Keyword(s):  
Population Growth ◽  
Bemisia Tabaci ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Genetically Engineered ◽  
Population Increase ◽  
Net Reproductive Rate ◽  
Bt Toxin ◽  
Demographic Performance

Abstract Complaints of severe damage by whiteflies in soybean fields containing genetically engineered (GE) varieties led us to investigate the role of transgenic soybean varieties expressing resistance to some insects (Cry1Ac Bt toxin) and to herbicide (glyphosate) on the population growth and feeding behavior of Bemisia tabaci (Gennadius) MEAM1 (Hemiptera: Aleyrodidae). In the laboratory, the whiteflies reared on the GE Bt soybeans had a net reproductive rate (R0) 100% higher and intrinsic rate of population increase (rm) 15% higher than those reared on non-GE soybeans. The increased demographic performance was associated with a higher lifetime fecundity. In electrical penetration graphs, the whiteflies reared on the GE soybeans had fewer probes and spent 50% less time before reaching the phloem phase from the beginning of the first successful probe, indicating a higher risk of transmission of whitefly-borne viruses. Data from Neotropical fields showed a higher population density of B. tabaci on two soybean varieties expressing glyphosate resistance and Cry1Ac Bt toxin. These results indicate that some GE soybean varieties expressing insect and herbicide resistances can be more susceptible to whiteflies than non-GE ones or those only expressing herbicide resistance. Most likely, these differences are related to varietal features that increase host-plant susceptibility to whiteflies. Appropriate pest management may be needed to deal with whiteflies in soybean fields, especially in warm regions, and breeders may want to consider the issue when developing new soybean varieties.

scholarly journals Biological performance of the predatory mite Neoseiulus idaeus (Phytoseiidae): a candidate for the control of tetranychid mites in Brazilian soybean crops

2016 ◽  
Vol 77 (2) ◽  
pp. 361-366 ◽  
Author(s):  
M. B. Reichert ◽  
M. Toldi ◽  
P. A. Rode ◽  
J. J. Ferla ◽  
N. J. Ferla
Keyword(s):  
Adult Development ◽  
Predatory Mite ◽  
Reproductive Rate ◽  
Agricultural Crop ◽  
Net Reproductive Rate ◽  
Glycine Max L ◽  
The Mean ◽  
Neoseiulus Idaeus ◽  
Biological Performance ◽  
Northwest Region

Abstract The soybean (Glycine max (L.): Fabaceae) is considered the most important agricultural crop in Brazil. Phytophagous tetranychid mites as Mononychellus planki McGregor, Tetranychus ludeni Zacher and T. urticae Koch have been considered pest in soybean crops. Neoseiulus idaeus Denmark & Muma (Phytoseiidae) is a predatory mite of T. ludeni and T. urticae. The aim of the present study was to evaluate the biological performance of N. idaeus when fed on T. urticae, T. ludeni and M. planki, coming from the Northwest region of Rio Grande do Sul state, Brazil. The study was conducted in the laboratory with individual predators supplied with different preys. The mean duration (days) of N. idaeus egg-adult development was similar independently of supplied prey (T. ludeni - 5.29±0.03; M. planki - 5.34±0.05 and T. urticae - 5.23±0.03 days). Female viability was 90% when fed on M. planki and 100% when fed on T. ludeni and T. urticae. Mean fecundity of N. idaeus was lower when fed on M. planki (4.6±1.58 eggs/female) and higher when fed on T. ludeni (21.8±3.22) and T. urticae (26.2±2.41). The mean generation time (T) was lower when N. idaeus fed on M. planki than when fed on T. ludeni and T. urticae. The net reproductive rate (Ro) was 4.42±0.49 on M. planki, 17.77±0.55 on T. ludeni and 20.59±0.48 on T. urticae. The innate capacity for increase (rm) was lower when N. idaeus was fed on M. planki (0.09) and higher when such predator was fed on T. ludeni (0.20) and T. urticae (0.22 females/females/day). These results demonstrated that N. idaeus is able to reach the complete development feeding on all the three tetranychid species. Mononychellus planki demonstrated to provide a sub-optimal diet if compared to T. ludeni and T. urticae.

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.

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