Observations on Males and Females of Sitophilus granarius (L.), the Granary Weevil, GG Strain, Exposed for Six Generations to Allethrin and Piperonyl Butoxide

1961 ◽  
Vol 93 (7) ◽  
pp. 545-552 ◽  
Author(s):  
C. Sevintuna ◽  
A. J. Musgrave
Keyword(s):  
Insect Resistance ◽  
Specific Resistance ◽  
Regression Line ◽  
Sitophilus Granarius ◽  
Recent Discussion ◽  
Granary Weevil ◽  
The Subject ◽  
Sublethal Doses ◽  
Males And Females ◽  
Genetic Phenomenon

In a recent discussion of the subject of insect resistance to insecticides, Brown (1958) has claimed that true resistance is characterized by a five-fold to ten-fold decrease in susceptibility. It is a genetic phenomenon arising as a result of selection. There is no evidence that insecticides are mutagenic, nor can resistance be induced by exposing insects to sublethal doses. A decrease in susceptibility that cannot be regarded as resistance is regarded as a condition of tolerance. In addition, the term “vigour tolerance”, intioduced by Hoskins and Gordon (see Brown, 1958) defines instances of enhanced tolerance due to extra vigour: true specific resistance is marked by a change of slope in the dosage-mortality regression line, while “vigour tolerance” is suggested if the regression line shifts but does not change in slope.

Microbial Isolations from the Granary Weevil Sitophilus granarius (L.) (Coleoptera: Curculionidae)

1960 ◽  
Vol 92 (8) ◽  
pp. 577-581 ◽  
Author(s):  
R. E. Crawford ◽  
L. A. McDermott ◽  
A. J. Musgrave
Keyword(s):  
Sitophilus Granarius ◽  
Granary Weevil ◽  
The Subject ◽  
Micro Organisms

The micro-organisms that accur in insects may be pathogenic, nonpathogenic, supposedly or actually beneficial, or casual invaders. The literature on the various aspects of the subject has become extensive (Buchner, 1953; Fraenkel, 1952; Shrewsbury and Barson, 1954a, 1954b; Steinhaus, 1946, 1949).

scholarly journals Effects of sublethal doses of contact insecticides on offspring production of different granary weevil populations

2010 ◽  
Vol 25 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Petar Kljajic ◽  
Ilija Peric
Keyword(s):  
Laboratory Population ◽  
Sitophilus Granarius ◽  
Wheat Grain ◽  
Granary Weevil ◽  
Offspring Production ◽  
Pirimiphos Methyl ◽  
Sublethal Doses ◽  
F2 Generation ◽  
Contact Insecticides ◽  
F1 Generation

The effects of prior contact of granary weevil (Sitophilus granarius L.) parents from a laboratory population, a Belgrade Port population (selected with LD70 pirimiphos-methyl) and a Bijeljina population (selected with LD70 deltamethrin) with filter paper treated with sublethal doses (LD20 and LD50) of the insecticides dichlorvos, malathion, chlorpyrifos-methyl, pirimiphos-methyl and deltamethrin on offspring production of the surviving insects in F1 generation (after 10 weeks) and F2 generation (after 16 weeks) in untreated wheat grain was examined under laboratory conditions. Offspring reduction of laboratory weevils was highest at 96% in the F1 generation after parents' contact with LD50 dichlorvos, and lowest in F2 generation after contact with LD50 pirimiphos-methyl with 84% more insects than in the control. The highest offspring reduction of selected weevils from Belgrade Port, 83%, was recorded in F1 generation after treatment with LD50 dichlorvos and chlopyrifos-methyl, and the lowest in F1 and F2 generations after contact with LD50 pirimiphos-methyl, around 44%. The highest offspring reduction of the selected weevils from Bijeljina, 100%, was found in F1 and F2 generations after contact with LD50 dichlorvos, malathion and deltamethrin, and the lowest again in F1 and F2 generations after contact with LD20 chlorpyrifos-methyl, in which case insect numbers were some 130% higher than in the control. The results indicate that sublethal insecticide doses, apart from a significant decrease in their efficacy against treated granary weevil populations, may also provoke an increase in insect numbers in the following generations.

EEG-correlates of work efficiency level among young persons with stress-induced bruxism

2021 ◽  
pp. 25-29
Author(s):  
A. E. Barulin ◽  
S. V. Klauchek ◽  
A. E. Klauchek
Keyword(s):  
Regression Models ◽  
Alpha Rhythm ◽  
Negative Relationship ◽  
Maximum Amplitude ◽  
Dominant Frequency ◽  
Regression Equations ◽  
Microsoft Excel ◽  
The Subject ◽  
Males And Females ◽  
The Relationship

Purpose of the study. To establish the relationship between neurophysiological status and the level of efficiency in young people with bruxism.Materials and methods. Two groups of 64 and 53 subjects (males and females) aged 20–35 years old with bruxism and non-bruxers were formed according to questionnaire results and physical examination. The level of efficiency was assessed by the results of sensorimotor tracking of a moving object (the ‘Smile’ model). Spectral analysis was performed for evaluation of the baseline electroencephalograms. Microsoft Excel and Statistica 10.0 programs were used for statistical data processing.Results. The level of efficiency was statistically significantly lower in the hardest test of Smile model among the individuals with bruxism (p < 0.05). The bruxers also demonstrated a significantly lower dominant frequency and maximum amplitude of alpha-rhythm (p < 0.05), and significantly higher dominant frequency of beta2 rhythm (p < 0.05). The dominant frequency and the maximum amplitude of the alpha-rhythm are parameters corresponding to significant coefficients of the regression analysis. A negative relationship was found between the degree of error during sensorimotor tracking and the frequency and amplitude of alpha-rhythm.Conclusion. Regression models present the relationship between the level of efficiency and the alpha-rhythm severity. The regression equations make it possible to determine the functional state of the subject using an electroencephalogram.

Granary Weevil, Sitophilus granarius (Linnaeus) (Coleoptera: Curculionidae)

2008 ◽  
pp. 1653-1653
Author(s):  
Stewart B. Peck ◽  
Carol C. Mapes ◽  
Netta Dorchin ◽  
John B. Heppner ◽  
Eileen A. Buss ◽  
...  
Keyword(s):  
Sitophilus Granarius ◽  
Granary Weevil

scholarly journals Contributions to the Knowledge of Morphology of the Granary Weevil (Sitophilus Granarius L.), Major Pest of the Stored Cereals

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Adrian DINUŢĂ ◽  
Horia BUNESCU ◽  
Ilonka BODIŞ
Keyword(s):  
Sexual Dimorphism ◽  
Scientific Literature ◽  
Sitophilus Granarius ◽  
Granary Weevil ◽  
Complex Study ◽  
Sexual Pheromones ◽  
The World ◽  
Major Pest

To solve the multiple practical aspects raised by the achieving of cereals stocks protection (especially wheat and corn) against granary weevil Sitophilus granarius L., the research aimed a complex study on the sexual dimorphism at this species, aspect which help to prevent the weevils damages using unpollutant methods (with the aid of sexual pheromones, ovogenesis inhibitors, etc.). Due to the summarily data in the scientific literature of the world refering to the sexual dimorphism of the species, a detailed study was made within the Entomology Laboratory at the Faculty of Agriculture of USAMV Cluj-Napoca and at the Center of Electronical Microscopy of Babeş-Bolyai University in Cluj-Napoca (Romania), during 2005-2009

scholarly journals The RAPD Analysis of Genetic Variability in the Granary Weevil (Sitophilus Granarius L.) Populations

2008 ◽  
Vol 48 (4) ◽  
Author(s):  
Katarzyna Nowaczyk ◽  
Aleksandra Obrępalska-Stęplowska ◽  
Magdalena Gawlak ◽  
Paweł Olejarski ◽  
Jan Nawrot
Keyword(s):  
Genetic Variability ◽  
Rapd Analysis ◽  
Sitophilus Granarius ◽  
Granary Weevil
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