Potency of Three Botanical Oils Against the Aphis Craccivora Koch (Homoptera: Aphididae) Nymphs Under Laboratory Conditions

2021 ◽  
Vol 19 (1) ◽  
pp. 139-154
Author(s):  
MA Hossain ◽  
MS Yasmin ◽  
MAA Bachchu ◽  
MA Alim
Keyword(s):  
Treatment Time ◽  
Probit Analysis ◽  
Aphis Craccivora ◽  
Tween 20 ◽  
Laboratory Conditions ◽  
Significant Difference ◽  
Aphis Craccivora Koch ◽  
Insect Mortality ◽  
Oil Repellent ◽  
Swietenia Mahagoni

Botanicals are promising and attractive alternatives for pest management. In the present study, three botanical oils namely neem (Azadirachta indica), karanja (Pongamia pinnata) and mehogony (Swietenia mahagoni) were tested against the nymphs of Aphis craccivora Koch to evaluate the toxic and repellent effects under laboratory conditions (25 ± 5oC, 65-75% RH). Four concentrations (0.5, 1.0, 1.5, and 2.0%) along with control were maintained with distilled water and tween-20 was used as emulsifier. Leaf dipped method were used for insect bioassay. Insect mortality was recorded at 24, 48 and 72 hours after intervals while repellency was carried out at 2 hours after intervals upto 10th hours and the collected data were analyzed through MSTAT-C program. Results indicated that all the tested oils had toxic and repellent effects against the A. craccivora nymphs. Among the tested botanical oils, no significant difference was observed in terms of mortality over treatment time. But significant difference was noticed over level of concentrations exerted by the botanical oils. The average highest mortality (28.62%) was recorded by the application of mehogony oil whereas neem oil showed the lowest mortality (27.21%) against the A. craccivora and the mortality was directly proportional to the level of concentrations and hour after treatment (HAT). Probit analysis showed the lowest LD50 values of mehogony oil which revealed the highest toxic effect against the nymph of bean aphid. The highest repellent effect (77.33%) was found in mehogony oil (repellent class IV) among all the botanical oils applied. On the contrary, neem (57.33%) and karanja (55.00%) oils belonged to the same repellent class that is repellent class II. Although all the tested botanical oils evaluated showed toxic and repellent effects but mehogony oil performed as the best potent oil against the nymphs. We therefore suggested using the mehogony oil for the management of bean aphid. SAARC J. Agric., 19(1): 139-154 (2021)

scholarly journals Effects of constant and fluctuating temperatures on development and reproduction of Megoura crassicauda and Aphis craccivora (Hemiptera: Aphididae)

2018 ◽  
Vol 29 (1) ◽  
pp. 1-12
Author(s):  
Li-Yuan Cheng ◽  
Yan Chang ◽  
Zhen-Zhen Chen ◽  
Yong-Yu Xu
Keyword(s):  
Intrinsic Rate ◽  
Aphis Craccivora ◽  
Intrinsic Rate Of Increase ◽  
Rate Of Increase ◽  
Significant Difference ◽  
Life Table Data ◽  
Aphis Craccivora Koch ◽  
Negative Impacts ◽  
Table Data ◽  
Fluctuating Temperatures

The influence of fluctuating temperatures on the development and fecundity of two aphids, Megoura crassicauda Mordvilko and Aphis craccivora Koch, were determined by collecting life table data at a constant temperature (22 °C) and two fluctuating temperatures (22 ± 3 °C and 22 ± 5 °C). The longevity of M. crassicauda decreased significantly at 22 ± 3 °C and 22 ± 5 °C, while there was no significant difference in the longevity of A. craccivora among the three treatments. The fecundity and intrinsic rate of increase (r) of M. crassicauda decreased significantly at both fluctuating temperatures, while A. craccivora showed the opposite tendency. These results showed that the fluctuating temperatures had negative impacts on the life history traits of M. crassicauda, but were beneficial for A. craccivora. Data obtained under constant temperatures may not reveal accurately enough the biotic responses of pests in the field.

scholarly journals Developing an Integrated Pest Management for the Control of Groundnut Aphid (Aphis craccivora Koch) [Homoptera: Aphididae] in Ganye Area Adamawa State-Nigeria

2020 ◽  
pp. 85-88
Author(s):  
Oaya C. S.
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Cultural Control ◽  
Aphis Craccivora ◽  
Control Methods ◽  
Physical Control ◽  
Physical Chemical ◽  
Significant Difference ◽  
Aphis Craccivora Koch ◽  
Number Of Branches

Field experiment was carried out under rain-fed conditions during the 2013 and 2014 cropping seasons at the Teaching and Research Farm of the Department of Agricultural Technology, Adamawa State College of Agriculture, Ganye, solely to develop an integrated pest management for the control of groundnut Aphid (Aphis craccivora Koch) [Homoptera: Aphididae]. The experimental Design used was the Randomized Complete Block Design (RCBD). Parameters measured were, average number of leaves per plot at 6 weeks after sowing, number of branches at 3 weeks after sowing, number of branches at 6 weeks after sowing, number of pods per plot, weight of harvested seeds per plot. The result obtained shows that, there was significant difference among the treatments in all the parameters measured at 0.05 level of probability using the Least Significant Difference (LSD). According to the results recorded, the highest mean yield of groundnut was obtained on plots treated with the combination of chemical and physical control methods (1444g) followed by plots treated with physical, chemical and cultural control methods combined (1296g). The highest mean number of pods per plant was recorded in the combination of physical, chemical and cultural control methods (18.00) followed by chemical and physical control methods as combined (15.00). The work shows that, the cultivation of groundnut with the control of groundnut Aphid (Aphis craccivora Koch) using integrated pest control applied as recommended facilitates better growth and guarantees good crop yield. The use of physical, chemical and cultural control method is profitable in Ganye Area of Adamawa State and is therefore suggested for use to local farmers.

scholarly journals EFEK LARVISIDAL EKSTRAK ETANOL DAUN KEMANGI (Ocimumsanctum Linn) TERHADAP LARVA INSTAR III Culexquinquefasciatus

Biomedika ◽  
2014 ◽  
Vol 6 (2) ◽  
Author(s):  
Wijayani LA ◽  
Isti’anah S
Keyword(s):  
Culex Quinquefasciatus ◽  
Ethanol Extract ◽  
Probit Analysis ◽  
Tween 20 ◽  
Ocimum Sanctum ◽  
Control Group ◽  
Larvicidal Effect ◽  
Significant Difference ◽  
Lc50 And Lc90 ◽  
Third Instar Larvae

Filariasis carried by mosquito Culex quinquefasciatus. Filariasis cause elephantiasis sequelae that often lower the sufferers productivity . Eradication of the disease is difficult, then , an attempt to do is to control the vector. The other way is to use insecticide vector control plant. Basil (Ocimum sanctum Linn) which contain fiavonoids, saponins, and eugenol has been shown in the laboratory have larvicidal effect. This study aimed to determine the larvicidal effects from Ethanol extract 96% of basilleaf (Ocimum sanctum Linn) against third instar larvae of Culex quinquefasciatus. This is an laboratory experimental methods with Post test only control group design. The Ethanol extract of basil leaf (Ocimum sanctum Linn) diluted to a concentration of 5000 ppm, 4500 ppm, 4000 ppm, 3500 ppm, 3000 ppm, 2000 ppm, 1500 ppm, 1000 ppm. The experiments were repeated three times. Each experiment included a control ie Tween 20 of 0.25% in distilled water. Statistical analysis was performed with Kruskal-Walls test and probit analysis to determine LC50 and LC90. In the analysis result of Kruskal Walls (CI: 95%) it obtained the results that each test group had a significant difference (p=0,005) in mortality of third instar larvae of Culex quinquefasciatus.The results of probit analysis showed that the ethanol extract of basil leaf give the concentration LC50 and LC90 2281.931 ppm and 5016.314 ppm. Ethanol extract 96% of basilleaf (Ocimum sanctum Linn) has an larvicidal effect on third instar larvae of Culex quinquefasciatus.Keywords: Culex quinquefasciatus - larvicidal - ethanol extract - Basilleaf (Ocimum sanctum Linn).

scholarly journals Comparative study to evaluate dosimetric differences in patients of locally advanced carcinoma cervix undergoing intracavitary brachytherapy under two different anaesthesia techniques: an audit from a tertiary cancer centre in India

2019 ◽  
Vol 31 (1) ◽  
Author(s):  
Divyesh Kumar ◽  
G. Y. Srinivasa ◽  
Ankita Gupta ◽  
Bhavana Rai ◽  
Arun S. Oinam ◽  
...  
Keyword(s):  
Day Care ◽  
Treatment Time ◽  
Locally Advanced ◽  
Effective Alternative ◽  
External Beam Radiation ◽  
Intracavitary Brachytherapy ◽  
High Dose ◽  
Carcinoma Cervix ◽  
Beam Radiation ◽  
Significant Difference

Abstract Background Carcinoma cervix is amongst the leading causes of mortality and morbidity in women population worldwide. High-dose-rate intracavitary brachytherapy (HDR-ICBT) post external beam radiation therapy (EBRT) is the standard of care in managing locally advanced stage cervical cancer patients. HDR-ICBT is generally performed under general anaesthesia (GA) in operation theatre (OT), but due to logistic reasons, sometimes, it becomes difficult to accommodate all patients under GA. Since prolonged overall treatment time (OTT) makes the results inferior, taking patients in day care setup under procedural sedation (PS) can be an effective alternative. In this audit, we tried to retrospectively analyse the dosimetric difference, if any, in patients who underwent ICBT at our centre, under either GA in OT or PS in day care. Results Thirty five patients were analysed 16/35 (45.71%) patients underwent HDR-ICBT under GA while 19/35 (54.28%) patients under PS. In both groups, a statistically significant difference was observed between the dose received by 0.1 cc as well as 2 cc of rectum (p < 0.05), while the bladder and sigmoid colon had comparable dosages. Conclusion Though our dosimetric analysis highlighted better rectal sparing in patients undergoing HDR-ICBT under GA when compared to patients under PS, PS can still be considered an effective alternative, especially in centres dealing with significant patient load. Further studies are required for firm conclusion.

scholarly journals Management alternatives for Carmenta theobromae (Busck, 1910) (Lepidoptera: Sesiidae) and Simplicivalva ampliophilobia (Lepidoptera: Cossidae), limiting pests of guava in Colombia

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Víctor Camilo Pulido-Blanco ◽  
Elberth Hernando Pinzón-Sandoval ◽  
Carlos Felipe González-Chavarro ◽  
Pablo Antonio Serrano-Cely
Keyword(s):  
Chemical Control ◽  
Cultural Practices ◽  
Agricultural Soils ◽  
Experimental Unit ◽  
Water Control ◽  
Strong Argument ◽  
Laboratory Conditions ◽  
Significant Difference ◽  
Management Alternatives ◽  
Harmful Effects

AbstractThe larval stages of Carmenta theobromae Busck (1910) and Simplicivalva ampliophilobia Davis, Gentili-Poole and Mitter (2008) attack the subcortical zone and pith in guava trees, respectively, in the first productive nucleus of fruit trees in Colombia: Hoya del Río Suárez (HRS). The presence of pest insects has been reported in 98% of the farms sampled in HRS (n = 124), with up to 96 and 11 simultaneous larvae per tree, respectively. Although the aspects of the basic biology and life cycle of both pests have been resolved, there are no strategies for managing populations in the field. Therefore, the aim of this study was to evaluate different management alternatives under laboratory and field conditions in HRS. In laboratory conditions, a completely randomized design was used in two separate experiments, each with six treatments: T1: Spinosad (a mixture of Spinosad A and D); T2: S-1,2-di(ethoxycarbonyl) ethyl 0,0-dimethylphosphorodithioate (chemical control); T3: Lecanicillium lecanii; T4: Beauveria bassiana; T5: Mix of B. bassiana and B. brongniartii, and T6: distilled water (control). The number of dead larvae per replicate per treatment was evaluated (DL), with experimental units of five and three larvae, respectively. In the field, to the two best alternatives found for each pest in the laboratory, pruning and keeping the area around the plants free of weeds were added as cultural management, in two separate additional experiments, each with three larvae as experimental unit per treatment. For C. theobromae, the best laboratory alternatives were chemical control (DL: 3.78) and L. lecanii (DL: 2.33), followed without statistical differences by B. bassiana (DL: 1.67). In the field, the virulence of B. bassiana improved (DL: 3), and together with pruning and keeping the area around the plants clear of weeds (DL: 3), they stood out as the best alternatives. For S. ampliophilobia under laboratory conditions, the best alternatives were Spinosad (2.74) and chemical control (DL: 2.66), without significant difference. In the field, there were no statistical differences between the alternatives, except for the control. This statistical parity of cultural practices, and biological and chemical management is an argument in favor of the use of the former to the detriment of the third, especially when the harmful effects of the molecule S-1,2 di (ethoxycarbonyl) ethyl 0, 0-dimethyl phosphorodithioate have been proven in air, water and agricultural soils, in addition to its association with thyroid cancer in humans. This is a strong argument to favor the use of synergies of cultural and biological management methods framed in IPM, as opposed to the use of chemical agents whose harmful effects are strongly documented, and whose use is becoming increasingly prohibited.

scholarly journals Treatment time, outcome, and anchorage loss comparisons of self-ligating and conventional brackets

2012 ◽  
Vol 83 (2) ◽  
pp. 280-285 ◽  
Author(s):  
Ferdinand M. Machibya ◽  
Xingfu Bao ◽  
Lihua Zhao ◽  
Min Hu
Keyword(s):  
Treatment Time ◽  
Peer Assessment ◽  
Steel Wire ◽  
Skeletal Changes ◽  
Lateral Cephalograms ◽  
Significant Difference ◽  
Conventional Brackets ◽  
Orthodontic Patients ◽  
Anchorage Loss ◽  
Mandibular Incisors

ABSTRACT Objective: To compare the treatment time, outcome, and anchorage loss among orthodontic patients treated by self-ligating brackets (SLBs) and conventional brackets (CBs). Materials and Methods: A retrospective cohort study compared 34 patients (SLB group) treated by SmartClip brackets (3M Unitek, Monrovia, Calif) to 35 patients (CB group) treated by conventional preadjusted Victory series brackets (3M Unitek) and ligated by stainless steel wire ligatures. Pretreatment (T1) and posttreatment (T2) lateral cephalograms were traced and analyzed using Pancherz sagittal-occlusion analysis to obtain skeletal and dental changes in the maxilla and the mandible. The dental cast models were assessed by the Peer Assessment Rating (PAR) Index for the treatment outcomes. Results: The mean treatment time for SLBs (19.19 months) did not show a statistically significant difference from 21.25 months of CBs; the treatment time and pretreatment PAR scores were strongly correlated. There was no difference in anchorage loss between the SLB and CB groups. There were significant dental and skeletal changes among adolescent orthodontic patients regardless of the bracket used. The lingual inclination of the mandibular incisors in the CB group was 3.62° more than in the SLB group (P &lt; .01). Conclusions: The treatment time and anchorage loss are not influenced by the type of bracket used. There are significant dental and skeletal changes among adolescent orthodontic patients regardless of the bracket used. There is significantly greater lingual inclination of mandibular incisors in the CB group than in the SLB group.

Laccase-catalyzed functionalization with 4-hydroxy-3-methoxybenzylurea significantly improves internal bond of particle boards

Holzforschung ◽  
2008 ◽  
Vol 62 (2) ◽  
pp. 223-229 ◽  
Author(s):  
Karin Fackler ◽  
Thomas Kuncinger ◽  
Thomas Ters ◽  
Ewald Srebotnik
Keyword(s):  
Internal Bond ◽  
Treatment Time ◽  
Urea Formaldehyde ◽  
Treated Wood ◽  
Untreated Wood ◽  
Strength Properties ◽  
Positive Interactions ◽  
Formaldehyde Resin ◽  
Significant Difference ◽  
Wood Particles

Abstract Enzymatic functionalization is an attractive tool to provide a reactive interface for further processing of lignocellulosic materials, such as wood particles and fibers. Here, spruce wood particles have been functionalized by fungal laccase combined with 4-hydroxy-3-methoxy-benzylamine (HMBA) or 4-hydroxy-3-methoxybenzylurea (HMBU). The expectation was crosslinking with resins in subsequent glueing processes, which should improve strength properties of particle boards. Essential process parameters, such as liquid to solid mass ratio and treatment time, were optimized on a laboratory scale resulting in HMBA and HMBU binding yields of 90% and above as determined by radiochemical mass balance analysis. We employed a multifactorial experimental design for board production from treated wood particles and urea/formaldehyde resin. Mechanical testing and multivariate data analysis revealed, for the first time, an increase of internal bond (IB) as a result of functionalization with HMBU. HMBA was not successful. Variance analysis of relevant parameters and their interactions demonstrated a highly significant difference (P>99.99%) between boards treated with laccase/HMBU versus untreated wood particles. Due to positive interactions, functionalization was most effective at high bulk density (750 kg m-3) and high resin content (10%) resulting in a calculated IB improvement of 0.12 N m-2 (21%).

scholarly journals Insecticidal Effect of Zinc Oxide Nanoparticles against Spodoptera frugiperda under Laboratory Conditions

Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1017
Author(s):  
Sarayut Pittarate ◽  
Julius Rajula ◽  
Afroja Rahman ◽  
Perumal Vivekanandhan ◽  
Malee Thungrabeab ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Life Cycle ◽  
Pest Management ◽  
Zno Nanoparticles ◽  
Spodoptera Frugiperda ◽  
Adult Emergence ◽  
Zno Nps ◽  
Alternative Source ◽  
Laboratory Conditions ◽  
Significant Difference

Fall armyworm Spodoptera frugiperda is a major pest of corn, rice, and sorghum among other crops usually controlled using synthetic or biological insecticides. Currently, the new invention of nanotechnology is taking root in the agricultural industry as an alternative source of pest management that is target-specific, safe, and efficient. This study sought to determine the efficacy of commercial Zinc Oxide (ZnO) nanoparticles (NPs) towards S. frugiperda under laboratory conditions. ZnO NPs were diluted into different concentrations (100–500 ppm), where the baby corn used to feed the S. frugiperda larvae was dipped. The development of the insect feeding on food dipped in ZnO solution was significantly (p < 0.05) affected, and the number of days that the insect took to complete its life cycle had a significant difference compared to the control. There was a significant difference in the adults’ emergence in all the concentrations of ZnO NPs compared to the control, with over 90% of the eggs successfully going through the life cycle until adult emergence. Additionally, several body malformations were observed throughout the lifecycle of the insect. Also, the fecundity of the females was greatly affected. The findings of this study suggest the possibility of exploitation of ZnO nanoparticles not only to manage S. frugiperda but to significantly reduce their population in the ecosystem through body deformations, reduced fecundity, reduced oviposition, and hatchability of eggs. It will be a valuable tool in integrated pest management regimens.

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

BIOEDUKASI ◽  
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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