scholarly journals Effect of flight activity of stem weevils (Ceutorhynchus napi, C. pallidactylus) and application time on insecticide efficacy and yield of winter oilseed rape

2014 ◽  
Vol 50 (No. 3) ◽  
pp. 129-134 ◽  
Author(s):  
T. Spitzer ◽  
P. Matušinský ◽  
D. Spitzerová ◽  
J. Bílovský ◽  
J. Kazda

During 2010–2012, we monitored flight activity of male and female stem weevils (Ceutorhynchus napi, C. pallidactylus) using yellow water traps, the effectiveness of various application dates for the insecticide thiacloprid (72 g active ingredient/ha), and the influence on yield. The first occurrence of beetles in traps was recorded after soil temperature at 5 cm reached 8°C in all experimental years. In all years, males of C. pallidactylus dominated in the traps and the times of beetles’ first occurrence. The most effective applications of thiacloprid at the stated rate were 14 days (2010), 6 days (2011), and 1 day (2012) after peak flight. Females with eggs appeared in bowls in 2010 and 2012 at first flight, while in 2011 no females were recorded. After the most effective applications, yields increased significantly in 2010 (+5% vs. the control) and in 2011 (+4%), and insignificantly in 2012 (+2%).

2021 ◽  
Vol 30 (2) ◽  
pp. 179-185
Author(s):  
Farhana Ferdousi ◽  
Shanjida Sultana ◽  
Tangin Akter ◽  
Pinakshi Roy ◽  
Shefali Begum

The flight activity and flight muscle of the melon fly, Bactrocera cucurbitae (Coquillett) (Diptera: Tephritidae) were observed. The Tethered technique was used to observe the flight activity in this study. The flight activity, and wing and flight muscles were compared between male and female melon flies. The results indicate that the female was relatively better and strong flier than the male. The mean duration of the flight activity of the females was 13.90 min/hour and of the males was 7.12 min./hour. The mean length, width, volume of wings of the males were 6.07 mm, 2.67 mm and 10.99 mm³, respectively. On the other hand, the mean length, width and volume of the wings of females were 7.07 mm, 2.87 mm and 15.60 mm³, respectively. In case of wing muscles, the mean volume of dorsal longitudinal muscle (DLM) in male and female was found 5.20 mm³ and 5.67 mm³, respectively. The mean length of flight wing muscle of male and female was 2.22 and 2.23 mm, respectively and the mean breadth of male and female was 1.65 and 1.77 mm, respectively. Dhaka Univ. J. Biol. Sci. 30(2): 179-185, 2021 (July)


Author(s):  
Ralf Borchardt ◽  
Ju¨rgen Raasch

For the dismantling of the pressure vessels and internals of the Greifwald WWER units 1–4, remote dismantling procedures are necessary. In order to realise this, 3 different cutting areas are used, i.e.: a wet cutting pool for highly activated parts, a dry cutting area for less activated parts and a specific cutting area for the annular water tank. Techniques and procedures were tested in a mock-up installation, with original components from the not operated reactor units 7 and 8. Special emphasis was given to evaluate the expected radiation exposure of the personnel, the maximum application time of the tools and the minimization of the secondary waste. The complete testing program was executed from October 1999 to September 2002. The authorised expert was involved in all steps of the testing. Thus a firm basis for the licensing and the execution of the remote dismantling could be established. Based on the results of the model dismantling and the selection of tools and procedures, the times necessary for the different operation steps could be calculated. With these figures, the manpower and the ambient dose rate it was possible to calculate the time need for the dismantling and also the expected dose commitment. This information was mandatory for the project planning and the preparation of the licensing documents. Presently the implantation of components and systems are going on in unit 2 and the start of cutting of the first activated pressure vessel is scheduled for end of 2003.


2011 ◽  
Vol 71 (3) ◽  
pp. 735-738 ◽  
Author(s):  
AM. Penteado-Dias ◽  
LBR. Fernandes ◽  
LGR. Iemma ◽  
MM. Dias

Protapanteles (Protapanteles) enephes (Nixon, 1965) (Hymenoptera, Braconidae, Microgastrinae) was reared from the host Fountainea ryphea phidile (Geyer, 1837) (Lepidoptera, Nymphalidae, Charaxinae), collected on Croton floribundus Spreng. (Euphorbiaceae) in São Carlos, São Paulo state, Brazil. The hyperperparasitoids Conura sp. (Hymenoptera, Chalcididae) and a Pteromalidae species are registered on this microgastrine species. Male and female specimens and cocoon of Protapanteles (Protapanteles) enephes are illustrated for the first time.


2013 ◽  
Vol 368 (1609) ◽  
pp. 20110336 ◽  
Author(s):  
Gavin Kelsey ◽  
Robert Feil

Fundamental to genomic imprinting in mammals is the acquisition of epigenetic marks that differ in male and female gametes at ‘imprinting control regions’ (ICRs). These marks mediate the allelic expression of imprinted genes in the offspring. Much has been learnt about the nature of imprint marks, the times during gametogenesis at which they are laid down and some of the factors responsible especially for DNA methylation. Recent work has revealed that transcription and histone modifications are critically involved in DNA methylation acquisition, and these findings allow us to propose rational models for methylation establishment. A completely novel perspective on gametic DNA methylation has emerged from epigenomic profiling. Far more differentially methylated loci have been identified in gametes than known imprinted genes, which leads us to revise the notion that methylation of ICRs is a specifically targeted process. Instead, it seems to obey default processes in germ cells, giving rise to distinct patterns of DNA methylation in sperm and oocytes. This new insight, together with the identification of proteins that preserve DNA methylation after fertilization, emphasizes the key role played by mechanisms that selectively retain differential methylation at imprinted loci during early development. Addressing these mechanisms will be essential to understanding the specificity and evolution of genomic imprinting.


Author(s):  
Nelson S Ratau

Covid-19 has infected approximately 160 million people globally since its first occurrence in China in 2019. Consequently, the whole world has been negatively impacted, with numerous people losing their lives, jobs and loved ones, including breadwinners in families. With the prevalence of the pandemic also came various views on the challenges that came with it. Literature cannot be left out of the modes that are providing an understanding of the negative impact of Covid-19 on the world. Therefore, this paper explores the poetry of the Nigerian poet, novelist and essayist, Ben Okri, in light of his thematisation of spirituality. By spirituality, it is meant the ‘recognition of a feeling or sense or belief that there is something greater than myself’, the times and situation(s) in which one exists’. In this paper, Okri’s poetry is considered as an essential index into how ‘the spiritual’ is conceived and articulated, even in times of pandemics. The paper adopts the Hermeneutical Approach as a theoretical lens through which Okri’s poetry may be best viewed and understood. The Hermeneutical Approach essentially entails the analysis of texts in order to develop insight or thoughtful wisdom. Furthermore, the paper proffers that Okri’s poetry is invested with a spiritual temper that makes it relevant as it encourages and makes and keeps ‘awake’ a spiritual sensibility in the people during the Covid-19 pandemic. The analysis is undergirded by a predetermined set of themes, namely; race, identity, healing, spirituality, thought and consciousness that Okri poeticises about and subsequently interrogates in his poetry. In the process, Okri’s poetry also encourages spiritual renaissance and the awakening of consciousness, by tempering in a reader the inalienable fact that to change or shape reality, people ought to do it themselves. Okri’s poetry challenges people to define themselves and defy all false definitions of themselves made by others. Ultimately, the paper explicates that Okri’s poetry is charged with pointed rebuke of people’s apparent apathy towards issues such as freedom, equality and transformation (all of which belong to the great stream of ‘the spiritual’), of which he submits that people ought to take charge of how these three important entities come about and exist in society.


2019 ◽  
Vol 17 (2) ◽  
pp. 1
Author(s):  
Lina .

This study aims to analyze the influence of Lazada's website quality on Shophaholic teenagers' online purchasing decisions in Palembang and analyze the differences between male and female participants in online purchasing decisions in Palembang. Shopaholic is defined as a tendency to shop compulsively with a high enough frequency. Shopaholic lifestyle teenagers spend a lot of time shopping as a saturation remover, as their own satisfaction and more hanging out with people who have the same hobby in shopping. Shopping becomes a picture of consumptive behavior that is difficult to change. The positive impact as a stress reliever and to keep up with the times. While the negative impact is the formation of consumptive, wasteful, and addictive behavior. This study uses a combination of exploratory research and explanatory research. Exploratory research aims to explore the phenomenon of male and female differences in shophaholic teenagers' online purchasing decisions in Palembang. Explanatory research to explain the relationship between research variables in this case the influence of Lazada's website quality on online shophaholic teen purchasing decisions in Palembang. This type of research is survey research. The data collection technique is a survey by distributing questionnaires developed from previous research. Population is Teenagers who live in Palembang and have shop online through the Lazada website. The sampling technique used purposive sampling with 138 respondents. Regression analysis is used to test the effect of Lazada's website quality on online purchasing decisions. The results showed that the influence of website quality lazada on shopaholic teenagers' online purchasing decisions was 73.6%, while 26.4% of purchasing decision variables were influenced by other variables outside of this study, including government policy variables, advertising socialization, and so on.


1985 ◽  
Vol 75 (1) ◽  
pp. 93-106 ◽  
Author(s):  
T. J. Perfect ◽  
A. G. Cook ◽  
D. E. Padgham ◽  
J. M. Crisostomo

AbstractDetailed studies were conducted over a five-year period at a rice farm in the Philippines on the flight activity of Nilaparvata lugens Stål) and Sogatella furcifera (Horváth). Suction traps were used to measure aerial density, and catches included immigrants, emigrants and insects undertaking trivial flight. Activity was partitioned using a variety of other trap types. Emigration was effectively monitored using net canopy traps and immigration was best measured using green water traps. Yellow water traps also measured immigration, but when macropterous adults were being produced within the plot, insects undertaking trivial flight were also caught. The light-trap caught immigrant and over-flying migrant insects.


1933 ◽  
Vol 23 (3) ◽  
pp. 359-378 ◽  
Author(s):  
D. H. Strangeways

Summary1. A method for the weekly determination of the amount of hair produced on defined areas of skin is described.2. The normal hair growth in adult male and female guinea-pigs has been determined. It is shown that the amount of hair produced on a defined area of skin in equal intervals of time is not constant. The fluctuations are mainly due to variations in the number of follicles which are active.3. There seem to be two periods during the year when an increased production occurs in most animals, in late spring and autumn. The times of increased hair growth correspond approximately to the occurrence of the moult.4. Measurements have been made of the length of the fibres at the end of a week's growth. It is found that fibres of all lengths are present and that the maximum length at the end of any week in any stage of the cycle is 5 mm.


2009 ◽  
Vol 45 (No. 3) ◽  
pp. 103-112 ◽  
Author(s):  
M. Seidenglanz ◽  
E. Poslušná J Hrudová

The effects of two pyrethroids and one combination of organophosphate and pyrethroid (alpha-cypermethrin, etofenprox, chlorpyrifos + cypermethrin) on <I>Ceutorhynchus pallidactylus</I> (Marsham, 1802) (<I>Coleoptera: Curculionidae</I>) were tested under field conditions in the Czech Republic in 2006–2008. Significant differences in the effects of the compared insecticides on <I>C. pallidactylus</I> were recorded in the particular years (2006, 2007, 2008). It was less important and somewhat less complicated to establish the most suitable time for spraying in the case of the chlorpyrifos + cypermethrin combination in comparison with the pyrethroids applied separately. The effectiveness of the tested insecticides was markedly influenced by the time of spraying. The effects of the pyrethroids applied singly achieved results comparable to those of the chlorpyrifos + cypermethrin combination only at the optimal spraying time. The most suitable time for spraying varied from the point when the first females appeared in yellow water traps in somewhat higher quantities to the time when a substantial proportion of caught females was able to lay eggs.


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