Statistical Evaluation Of The Larvicidal Effect Of Diflubenzuron On Culex Pipiens Larval Stages

Abstract Diflubezuron is increasingly used in areas where mosquito larvae developed resistance to other insecticides. In our community diflubenzuron is not used to control mosquito larvae. Two formulations of 1% diflubenzuron (on corn-cob EF-1, and zeolite EF-2) were tested on Culex pipiens L (larvae) on one canal in the Belgrade suburb area. The effect was followed for seven weeks after application of the formulations. Formulation EF1 achieved a reduction in mosquito L1L2 larvae between 23.9% and 89.4%. The change was statistically significant the 21st and 28th day (p<0.001), 35th and 42nd day (p<0.01) and 49th day (p<0.05). The maximal reduction obtained by formulation EF2 was 69.1%. The accomplished reduction was significant on the 28th and 42nd day (p<0.001), 35th day (p<0.01) and 21st (p<0.05). Both formulations have maintained a good residual effect on the lower developmental larval stages. Maximum reduction achieved by EF1 on L3L4 larvae was 97.4%. Reduction of larvae was high between the 7th and 42nd day (66.4 - 97%). Statistically significant values were recorded on the 21st, 28th and 35th day. Formulation EF2 achieved a reduction of 99.5%. A statistically significant reduction in the value of mosquito larvae was obtained on the 14th, 21st, 28th, 35th and 42nd day. Between the two used formulations there was no significant difference in the number reduction of lower larval stages, but for the higher larval stages EF1 proved to be more efficient.

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MADRE DE CACAO (Gliricidia sepium) AND BOTTLEBRUSH (Callistemon viminalis) LEAVES EXTRACT AS MOSQUITO LARVICIDE

Science Heritage Journal ◽

10.26480/gws.01.2021.08.13 ◽

2021 ◽

Vol 5 (1) ◽

pp. 08-13

Author(s):

Jelna M. De Leon ◽

Michael Jomar B. Ison ◽

Rolando V. Maningas

Keyword(s):

Gliricidia Sepium ◽

Environmental Concerns ◽

Phytochemical Analysis ◽

Mosquito Larvae ◽

Larvicidal Effect ◽

Home Based ◽

Significant Difference ◽

Callistemon Viminalis ◽

Cacao Tree ◽

Harmful Effects

Mosquitoes are major disease vectors, therefore keeping them under control is essential for human health. Insecticides have been shown to be effective at controlling mosquito populations, but insecticide resistance and environmental concerns are increasing. Looking for the health and environment hazards and cost of synthetic insecticides, there is a need to find a safe, practical and effective alternatives. This study aimed to determine the level of effectiveness and the presence of phytochemical analysis of Gliricidia sepium and Callistemon viminalis leaves extracts. It also included the larvicidal effect from the different extract formulations of Madre de Cacao and Bottlebrush at different instar stage of mosquito larvae. It further investigated whether there is no significant difference in the effectivity among the five different formulations of leaves extract. Results of the experiment revealed that 100% Madre de Cacao formulation were found to be very effective in killing mosquito larvae followed by 75%:25%, 50%:50%, 25%:75% while 100% Bottlebrush formulation came out as less effective. Likewise, Madre de Cacao and Bottlebrush contain sterols, flavonoids, alkaloids, saponins, glycosides, tannins and triterpene that have larvicidal impact on mosquito. Finally, a significant difference exists among the different treatments. Madre de Cacao and Bottlebrush maybe recommended as home-based mosquito larvicide which were found to be not hazardous to the health of people in extracting the leaves. A community may build and designate a certain area for plantation and development of Madre de Cacao tree and other plants that potentially source of insecticides specially mosquito larvae that can lessen the harmful effects of using commercial pesticides in controlling mosquitoes.

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Orthodontics-Awareness Amongst Medical Students

Orthodontic Journal of Nepal ◽

10.3126/ojn.v10i3.35496 ◽

2020 ◽

Vol 10 (3) ◽

pp. 49-56

Author(s):

Türkan SEZEN ERHAMZA ◽

Kübra A ARSLAN ÇARPAR

Keyword(s):

Medical Students ◽

Statistical Evaluation ◽

P Value ◽

Chi Square ◽

Level Of Education ◽

Significant Difference ◽

Chi Square Test ◽

Treatment Procedures

Introduction: The study aimed to evaluate the knowledge and awareness of orthodontics, a specialty of dentistry,amongst Medical Students. Materials and Method: A sample of 550 students (279 female, 226 male aged between 18 and 36 years) were attented.Of the subjects, 58.6% (n = 296) were preclinical students, while 41.4% (n = 209) were clinical students. The students were informed about the questionnaire and asked to fill in the questionnaire forms. For the comparison of data between groups (gender, level of education), the chi-square test was used. A chi-square test was used for statistical evaluation and the p-value < 0.05 was considered statistically significant. Result: 385 students (76.2%) had heard the term orthodontics although 41.2% of the subjects knew that orthodonticswas concerned with malocclusions and their treatment. The question about treatment procedures was answeredas scaling by 35.8%, tooth polishing by 40%, tooth aligning by 89.9% of the students. The percentage of knowingorthodontics to be related to tooth aligning showed a significant difference between female and male (p = 0.006), andpreclinical and clinical students (p = 0.033). Of the participants, 42.8% thought that dentures, 83% brackets, 78.8% ofremovable appliances were used by orthodontists. Conclusion: Our results have shown that medical students should have more information about orthodontics, aspecialty of dentistry.

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Etude de l’effet rémanent de Mavi MNPV dans un champ de niébé

International Journal of Biological and Chemical Sciences ◽

10.4314/ijbcs.v14i6.23 ◽

2020 ◽

Vol 14 (6) ◽

pp. 2219-2229

Author(s):

A. Kindozandji ◽

B.D. Datinon ◽

K. Amevoin ◽

A.N. Nondichao ◽

A.I. Glitho ◽

...

Keyword(s):

Research Work ◽

Residual Effect ◽

Maruca Vitrata ◽

Sub Saharan Africa ◽

Important Food ◽

Food Legumes ◽

Significant Difference ◽

Sub Saharan ◽

Rate Of Emergence ◽

And Control

Le niébé est l’une des légumineuses alimentaires la plus importante dans toutes les régions de l’Afrique Sub-saharienne. L’objectif de ce travail était d’étudier l’effet rémanent de Mavi Multinucléo polyhedrovirus (Mavi MNPV) après la récolte du niébé au champ. Le champ a été traité 5 fois au biopesticide Mavi MNPV à la fréquence de sept jours. Deux semaines après la récolte, deux plants ainsi que les graines de chaque traitement sur chaque unité parcellaire ayant reçu les traitements de Mavi MNPV de 107, 108 et 109 virions/ml ont été collectés et amenés au laboratoire avec le substrat de développement de la plante (sable). Aucune des formulations issues des substrats sable, racines, feuilles, tiges et graines n’a affecté la mortalité des larves L2 et L3 de Maruca vitrata et aucune différence significative n’a été observée entre les traitements et le témoin. Quels que soient les traitements, le taux d’émergence des adultes est élevé ; ce qui signifie que la variation de la concentration de Mavi MNPV ne conditionne pas sa présence dans le sol, les tiges, les feuilles, les racines et les graines. Le biopesticide Mavi MNPV n’est pas persistant dans la nature.Mots clés : Niébé, Mavi MNPV, Maruca vitrata, Effet rémanent English Title: Study of the residual effect of Mavi MNPV in a cowpea field Cowpea is one of the most important food legumes in all regions of Sub-Saharan Africa. The objective of this research work was to study the persistence effect of Mavi Multinucleus polyhedrovirus (Mavi MNPV) after field harvest of the cowpea. The field was treated 5 times with Mavi MNPV biopesticide at seven days. Two weeks after harvest, two plants as well as the seeds from each treatment on each plot unit that received Mavi MNPV treatments of 107, 108 and 109 virions / ml were removed and brought to the laboratory with the plant development substrate (sand). None of the formulations from sand, root, leaf, stem and seed substrates did not affect the mortality of L2 and L3 larvae of Maruca vitrata and no significant difference was observed between treatments and control. Regardless of the treatments, the rate of emergence of adults is high; this means that the variation in the concentration of Mavi MNPV does not condition its presence in soil, stems, leaves, roots and seeds. Mavi MNPV biopesticide is not persistent in nature.Keywords: Cowpea, Mavi MNPV, Maruca vitrata, Residual effect.

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Effect of Leaves and Fruits Ethanolic Extract of Duranta repens on Mosquito Culex pipens pipens

Baghdad Science Journal ◽

10.21123/bsj.8.4.870-876 ◽

2011 ◽

Vol 8 (4) ◽

pp. 870-876 ◽

Cited By ~ 1

Author(s):

Baghdad Science Journal

Keyword(s):

Life Cycle ◽

Mortality Rate ◽

High Mortality ◽

Culex Pipiens ◽

Ethanolic Extract ◽

Pupal Stage ◽

Fourth Generation ◽

Larval Instars ◽

Larval Stages ◽

Biological Performance

The study aimes to investigate the effects of leaves & fruits ethanolic extract of Duranta repens L. on biological performance for all stages of life cycle of the mosquito Culex pipiens piepiens L., For this purpose the mosquitoes were reared in the laboratory till the fourth generation .Different concentrations of leaves (800,1000,1200,1400ppm) and fruits (800,1000,1200ppm) were tested on (eggs,larval stages,pupal stages and the adult stages). The results revealed that the extracts gave highest mortality rate for the eggs at(100%) compared with control,fruits extract shown highest mortality rate of the four larval instars (100%)at 1200ppm compared with leave extract at(80,50,33.33,20%).Also the extract caused a high mortality rate for pupal stage compared with fruits extract at(76.66,53.33%)respectively.Also ethanolic extract caused a 83.33,76.66% for male &femail. Developmental deformation was observed.. In conclusion, the findings of the present study indicate that the leaves &fruits extracts of Duranta repens L., , can be widely and effectively used in the control of mosquito.

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The Toxicity of Srikaya Seed Granules (Annona squamosa L.) with Different Heating Temperatures Against the Larva of Aedes aegypti L.

BIOEDUKASI ◽

10.19184/bioedu.v18i1.15683 ◽

2020 ◽

pp. 1

Author(s):

Rima Gloria Purwanto ◽

Dwi Wahyuni ◽

Joko Waluyo

Keyword(s):

Aedes Aegypti ◽

Mosquito Control ◽

Heating Temperature ◽

Probit Analysis ◽

Mosquito Larvae ◽

Annona Squamosa ◽

Forest Region ◽

Randomized Design ◽

Significant Difference ◽

Lower Temperature

Abstract: Aedes aegypti L. is a mosquito carrying dengue virus that causes dengue fever, especially in Southeast Asia which is a tropical rain forest region which is a habitat for mosquito growth. Aedes aegypti L. mosquito control is carried out by chemical means of fogging and using abate but this control actually causes Aedes aegypti L. mosquitoes to become resistant or immune to chemical drugs so that a new breakthrough is created by making bioinsecticides biologically to eradicate the Aedes aegypti L. mosquito. with characteristics that are environmentally friendly and do not kill non-target animals and cause the Aedes aegypti L. mosquito not to become resistant. To be able to realize this desire so that the sugar cane granules extract of Annona squamosa L. containing active compounds in the form of annonain and squamosin so that they are toxic to Aedes aegypti L. mosquito larvae. Further research is to test the heating temperature level of the granules of Annona squamosa L. extract temperature of 40 ° C and 60 ° C which is more deadly of Aedes aegypti L. mosquito larvae. This research method uses a completely randomized design with four repetitions. The temperature of 60 ° C uses concentrations of 1 ppm, 6 ppm, 12 ppm, 18 ppm, 24 ppm and 30 ppm. As for the temperature of 40 ° C using concentrations of 1 ppm, 7 ppm, 14 ppm, 21 ppm, 28 ppm, and 35 ppm, each temperature compared with aquadest and abate. Data analyzed using probit analysis to determine the LC50, then followed by a statistical test paired sample T-test with SPSS to find out a significant difference between heating temperatures of 40 ° C to 60 ° C. These results then show that a higher temperature of 60 ° C has a higher level of toxicity compared to a lower temperature of 40 ° C.

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Larvicidal Effect of Petroleum Oils, Tar oil and Surfactants against the Mosquito, Culex pipiens (Dipetra: Culicidae) Larvae

Egyptian Academic Journal of Biological Sciences E Medical Entomology & Parasitology ◽

10.21608/eajbse.2020.67940 ◽

2020 ◽

Vol 12 (1) ◽

pp. 1-10

Author(s):

Hanaa Mahmoud ◽

Ahmed El-Sisi ◽

Yousreya Abdel-Hami ◽

Walaa Moselhi ◽

Riham Taha

Keyword(s):

Culex Pipiens ◽

Larvicidal Effect ◽

Tar Oil ◽

Petroleum Oils

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Acaricidal Activity of Commiphora merkeri Bark Exudate against Two Species of Rhipicephalus Koch (Acari; Ixodidae) by Larval and Adult Immersion Test

Journal of Applied Life Sciences International ◽

10.9734/jalsi/2021/v24i130214 ◽

2021 ◽

pp. 1-8

Author(s):

Ester Innocent ◽

Ismail Almas Athman ◽

Suzana Augustino

Keyword(s):

Petroleum Ether ◽

Residual Effect ◽

Integrated Approach ◽

Immersion Test ◽

Rhipicephalus Appendiculatus ◽

Tick Control ◽

Acaricidal Activity ◽

Significant Difference ◽

Alternative Agent

Ticks pose a threat in the infestation of both wild and domestic animals, thereby causing an increase in chances for transmission of diseases. Despite of the wide use of Commiphora species in tick control, no acaricidal activity of Commiphora merkeri. Engl. Exudate have been scientifically assessed. The acaricidal activity of the exudate extract and its Petroleum ether (PE), Dichloromethane (DCM) and Ethyl acetate (ETOAC) fractions were carried out by using the larval immersion test (LIT) and adult immersion test (AIT), against Rhipicephalus appendiculatus and Rhipicephalus averts. The crude extracts of C. merkeri showed 80% and 70% mortality on the LIT bioassay at concentration of 1.0 mg/mL for R. averts and R. appendiculatus, respectively. There was no statistical difference (p≥0.05) in activity of petroleum ether and dichloromethane fractions exhibiting 100% mortality at concentration of 1.0 mg/mL for R. appendiculatus and R. averts, also at 0.8 mg/mL to R. averts species. R. averts was more susceptible that R. appendiculatus showing stable incremental mortality in all concentration levels. In the AIT, no statistical significant difference (p≥0.05) in reduction was observed for crude extract of C. merkeri and petroleum ether fractions by having no surviving R. averts above 0.025 mg/mL after 24 and 72 h. The same trend was observed for R. appendiculatus within 24 h of exposure. However, at lower concentrations the residual effect of treatments on the ticks continued to elicit the effect over time having few or no immediate effect of death after exposure, This was vivid for R. averts within 24 and after 72 h. Follow up of survived engorged adults indicated that, the ticks could lay eggs but the eggs were not viable for hatching. This justifies its uses as an alternative agent in an integrated approach in reducing tick infestation among Pastoralist.

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Study the change in the mosquito larvae (Culex pipiens) in water treated with short pulses electric filed

Electromagnetic Biology and Medicine ◽

10.1080/15368378.2021.2012787 ◽

2021 ◽

pp. 1-13

Author(s):

Ebtesam A. Mohamad ◽

Alyaa A. Elfky ◽

Reem H. El-Gebaly ◽

Amira Afify

Keyword(s):

Culex Pipiens ◽

Mosquito Larvae ◽

Short Pulses ◽

Electric Filed

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Statistical Evaluation of Conventional and Portable Instrumentations for Cr(VI) Analysis on Chemistry Laboratory Waste Water

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.840.406 ◽

2020 ◽

Vol 840 ◽

pp. 406-411

Author(s):

Suherman Suherman ◽

Ghilma Milawonso ◽

Kinichi Morita ◽

Hitoshi Mizuguchi ◽

Yuji Oki

Keyword(s):

Waste Water ◽

Inductively Coupled Plasma ◽

Statistical Evaluation ◽

Limit Of Detection ◽

Liquid Waste ◽

Chemistry Laboratory ◽

Quality Of Data ◽

Limit Of Quantification ◽

Validation Methods ◽

Significant Difference

The development of portable instrumentation for heavy metals analysis was increased rapidly. However, the quality of data from portable methods has so far been questioned when compared to conventional instrumentation. In this research, a comparative study of conventional and portable instrumentations for Cr(VI) analysis on liquid waste water of Chemistry Laboratory at Universitas Gadjah Mada (UGM) was conducted. This research started with validation and statistical evaluation of instrumentation methods which are UV-Visible spectrophotometer, portable spectrophotometer (PiCOEXPLORER) and Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES). The validation methods consist of determination of linearity, sensitivity, limit of detection and limit of quantification. The results showed that the validation methods of ICP-AES were better than PiCOEXPLORER and UV-Vis spectrophotometer. Based on t-test, it was obtained that the result of Cr(VI) analyses with the comparison of UV-Vis and PiCOEXPLORER, ICP-AES and PiCOEXPLORER, and UV-Vis and ICP-AES; there were no significant difference (tcount< ttable). The ANOVA test (F test) results showed that the Fcount value is less than Ftable so that the results of Cr(VI) analysis in the standard solution and liquid waste samples measured by three instrumentations. Thus, it was concluded that portable instrumentations was good and gives the same quality as conventional instrumentations (UV-Vis and ICP AES).

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