scholarly journals Impact of Anthracnose on Avocado Production in Kenya

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1103D-1104
Author(s):  
Lusike A. Wasilwa ◽  
Joseph K. Njuguna ◽  
Violet Kirigua ◽  
Charles N. Waturu ◽  
Richelle A. Stafne ◽  
...  
Keyword(s):  
Large Scale ◽  
Control Measures ◽  
Fruit Rot ◽  
Agricultural Practice ◽  
Pests And Diseases ◽  
Planting Material ◽  
Good Agricultural Practice ◽  
Postharvest Handling ◽  
The Impact ◽  
European Markets

Avocado is the leading horticultural export in Kenya. In 2003, Kenya exported about 19,000 t, compared to 23 t in 1970. Most of the fruit is exported to the European markets. There are several constraints limiting production of avocado in Kenya, including limited superior varieties or planting material, poor infrastructure, poor market information, and poor tree crop management. Although several diseases infect avocado, the most important are fruit rot pathogens, such as anthracnose, cercospora, and scab. However, diseases and pests have not been important to avocado production in Kenya. Recently (2004), the constraint limiting avocado production in Kenya is anthracnose, caused by Colletotrichum gloeospoirioides. Little is known in Kenya on the impact of this disease on production and income realized by small-(<1 acre) or large-scale growers. The objectives of this research were to quantify losses attributed to anthracnose in Kenya, determine the current disease control measures, and recommend good agricultural practice in conformance with EUREP-GAP. A survey was conducted in the avocado growing areas to identify and document constraints limiting avocado production in 2004. The highest losses were reported from central Kenya, where exporters reported up to 100% losses. Because all avocado varieties growing in Kenya are susceptible to anthracnose, it is recommended that good management, i.e., control of pests and diseases and good postharvest handling of fruit to minimize injury used as an entry point by anthracnose, should be enforced.

Breeding and usage of sugar beet cultivars and hybrids resistant to sugar beet nematode Heterodera schachtii

2015 ◽  
Vol 2 (1) ◽  
pp. 12-22 ◽  
Author(s):  
L. Pylypenko ◽  
K. Kalatur
Keyword(s):  
Sugar Beet ◽  
Sugar Content ◽  
Production Capacity ◽  
Nematode Resistance ◽  
Control Measures ◽  
Heterodera Schachtii ◽  
Yield Reduction ◽  
Agricultural Practice ◽  
Germplasm Exchange ◽  
Good Agricultural Practice

Heterodera schachtii Schmidt, 1871 is one of the most economically important pests of sugar beet (Beta vulgaris L.) worldwide. It is also widespread in most sugar beet growing regions in Ukraine causing serious yield reduction and decreasing sugar content of sugar beet in infested fi elds. An advanced parasitic strategy of H. schachtii is employed to support nematode growth, reproduction and harmfulness. In intensive agriculture systems the nematode control measures heavily rely on nematicides and good agricultural practice (crop rota- tion in the fi rst place). But alternative strategies based on nematode resistant sugar beet cultivars and hybrids are required as none of nematicides approved for the open fi eld application are registered in Ukraine. Here we review the achievements and problems of breeding process for H. schachtii resistance and provide the results of national traditional breeding program. Since the beginning of 1980s fi ve sugar beet cultivars (Verchnyatskyi 103, Yaltuschkivska 30, Bilotcerkivska 45, BTs-40 and Yuvileynyi) and seventeen lines partly resistant or toler- ant to H. schachtii have been obtained throughout targeted crossing and progenies assessment in the infested fi elds. The further directions for better utilization of genetic sources for nematode resistance presented in na- tional gene bank collection are emphasized. There is a need for more accurate identifi cation of resistance genes, broader application of reliable molecular markers (suitable for marker-assisted selection of nematode resistant plants in the breeding process) and methods for genetic transformation of plants. Crop cash value and national production capacity should drive the cooperation in this fi eld. Knowledge as well as germplasm exchange are thereby welcomed that can benefi t breeding progress at national and international level.

An Integrated Decision Support System for Intercropping

2010 ◽  
Vol 2 (3) ◽  
pp. 51-66 ◽  
Author(s):  
A. S. Sodiya ◽  
A. T. Akinwale ◽  
K. A. Okeleye ◽  
J. A. Emmanuel
Keyword(s):  
Decision Support ◽  
Decision Support System ◽  
Support System ◽  
Crop Production ◽  
Large Scale ◽  
Weather Condition ◽  
Agricultural Practice ◽  
Pests And Diseases ◽  
General Decline ◽  
Fertility Protection

Intercropping, which is the agricultural practice of growing two or more crops in the same land area, is not currently yielding adequate results in Africa. Despite the advantages of intercropping like improved soil fertility, protection against pests and diseases and eventual increase in farm yield, this farming practice is faced with challenges—inadequate planning, bad crop management and lack of required intercropping expertise. Consequently, this has resulted in inadequate reward for farmers and a general decline in crop production. In this regard, the authors present an Intelligent and Integrated Intercropping Decision Support System for Intercropping (IDSS-I) for improved crop production. The design adopts a forecasting component that provides farmers with the estimated yield and income depending on the size of land, soil type and weather condition. Although the implementation was carried out using JAVA and SQL, usability testing revealed 85% acceptance of the tool among the contacted 10 large scale farmers. It was also confirmed that the system provided 95% diagnosis information for 90% common Africa crop diseases.

scholarly journals Verticillium Wilt of Olive and Its Control: What Did We Learn during the Last Decade?

Plants ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 735 ◽  
Author(s):  
Nuria Montes-Osuna ◽  
Jesús Mercado-Blanco
Keyword(s):  
Integrated Management ◽  
Management Strategies ◽  
Control Measures ◽  
Effective Control ◽  
Soil Biology ◽  
Pests And Diseases ◽  
Sensing Technology ◽  
Olive Cultivation ◽  
Underlying Mechanisms ◽  
The Impact

Verticillium (Verticillium dahliae Kleb.) wilt is one of the most devastating diseases affecting olive (Olea europaea L. subsp. europaea var. europaea) cultivation. Its effective control strongly relies on integrated management strategies. Olive cultivation systems are experiencing important changes (e.g., high-density orchards, etc.) aiming at improving productivity. The impact of these changes on soil biology and the incidence/severity of olive pests and diseases has not yet been sufficiently evaluated. A comprehensive understanding of the biology of the pathogen and its populations, the epidemiological factors contributing to exacerbating the disease, the underlying mechanisms of tolerance/resistance, and the involvement of the olive-associated microbiota in the tree’s health is needed. This knowledge will be instrumental to developing more effective control measures to confront the disease in regions where the pathogen is present, or to exclude it from V. dahliae-free areas. This review compiles the most recent advances achieved to understand the olive–V. dahliae interaction as well as measures to control the disease. Aspects such as the molecular basis of the host–pathogen interaction, the identification of new biocontrol agents, the implementation of “-omics” approaches to unravel the basis of disease tolerance, and the utilization of remote sensing technology for the early detection of pathogen attacks are highlighted.

scholarly journals The impact of mid-latitude intrusions into the polar vortex on ozone loss estimates

2003 ◽  
Vol 3 (2) ◽  
pp. 395-402 ◽  
Author(s):  
J.-U. Grooß ◽  
R. Müller
Keyword(s):  
Large Scale ◽  
Loss Rate ◽  
Polar Vortex ◽  
Control Measures ◽  
Lagrangian Model ◽  
The Arctic ◽  
Match Method ◽  
Ozone Loss ◽  
The Impact ◽  
Loss Rates

Abstract. Current stratospheric chemical model simulations underestimate substantially the large ozone loss rates that are derived for the Arctic from ozone sondes for January of some years. Until now, no explanation for this discrepancy has been found. Here, we examine the influence of intrusions of mid-latitude air into the polar vortex on these ozone loss estimates. This study focuses on the winter 1991/92, because during this winter the discrepancy between simulated and experimentally derived ozone loss rates is reported to be the largest. Also during the considered period the vortex was disturbed by a strong warming event with large-scale intrusions of mid-latitude air into the polar vortex, which is quite unusual for this time of the year. The study is based on simulations performed with the Chemical Lagrangian Model of the Stratosphere (CLaMS). Two methods for determination the ozone loss are investigated, the so-called vortex average approach and the Match method. The simulations for January 1992 show that the intrusions induce a reduction of vortex average ozone mixing ratio corresponding to a systematic offset of the ozone loss rate of about 12 ppb per day. This should be corrected for in the vortex average method. The simulations further suggest, that these intrusions do not cause a significant bias for the Match method due to effective quality control measures in the Match technique.

scholarly journals Reduction of malaria vector mosquitoes in a large-scale intervention trial in rural Burkina Faso using Bti based larval source management

2019 ◽  
Vol 18 (1) ◽  
Author(s):  
Peter Dambach ◽  
Till Baernighausen ◽  
Issouf Traoré ◽  
Saidou Ouedraogo ◽  
Ali Sié ◽  
...  
Keyword(s):  
Malaria Vector ◽  
Large Scale ◽  
Intermittent Preventive Treatment ◽  
Indoor Residual Spraying ◽  
Control Measures ◽  
Sub Saharan Africa ◽  
Intervention Period ◽  
Selective Treatment ◽  
Breeding Sites ◽  
The Impact

Abstract Background Malaria remains one of the most important causes of morbidity and death in sub-Saharan Africa. Along with early diagnosis and treatment of malaria cases and intermittent preventive treatment in pregnancy (IPTp), vector control is an important tool in the reduction of new cases. Alongside the use of long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS), targeting the vector larvae with biological larvicides, such as Bacillus thuringiensis israelensis (Bti) is gaining importance as a means of reducing the number of mosquito larvae before they emerge to their adult stage. This study presents data corroborating the entomological impact of such an intervention in a rural African environment. Methods The study extended over 2 years and researched the impact of biological larviciding with Bti on malaria mosquitoes that were caught indoors and outdoors of houses using light traps. The achieved reductions in female Anopheles mosquitoes were calculated for two different larviciding choices using a regression model. Results In villages that received selective treatment of the most productive breeding sites, the number of female Anopheles spp. dropped by 61% (95% CI 54–66%) compared to the pre-intervention period. In villages in which all breeding sites were treated, the number of female Anopheles spp. was reduced by 70% (95% CI 64–74%) compared to the pre-intervention period. Conclusion It was shown that malaria vector abundance can be dramatically reduced through larviciding of breeding habitats and that, in many geographical settings, they are a viable addition to current malaria control measures.

scholarly journals Macroeconomic impacts of cigarette consumption in Pakistan

2020 ◽  
Vol 29 (Suppl 5) ◽  
pp. s337-s343
Author(s):  
Wasim Saleem ◽  
Mohammad Asif Iqbal
Keyword(s):  
Tobacco Use ◽  
Large Scale ◽  
Simulation Analysis ◽  
Large Population ◽  
Control Measures ◽  
Cigarette Consumption ◽  
Fiscal Year ◽  
Input Output ◽  
Minimal Impact ◽  
The Impact

BackgroundPakistan has a large population of tobacco users, with about 24 million adults consuming tobacco products in one form or another. There is a dearth of research on the impact of a reduction in tobacco use on Pakistan’s economy which can inform policy-makers on the extent that tobacco control measures would affect macroeconomic indicators such as output and employment.ObjectivesThe objective of this study is to quantify the changes in output, income and employment resulting from changes in cigarette consumption and to quantify the impact of such changes on the overall economy.MethodologyThe study uses the input–output table for the fiscal year 2010–2011 for Pakistan’s economy, to estimate the output, income and employment multipliers. The Leontief input–output model is used to estimate the sectorwise multiplier effects. It estimates direct, indirect and consumption-induced effects of changes in tobacco use on the economy.ResultsThe cigarette industry’s share in large-scale manufacturing and industrial employment is 1.1% and 0.3%, respectively. The estimates of gross output, income and employment multipliers for the cigarette industry have relatively small magnitudes indicating minimal impact on the economy. A simulation analysis based on the latest estimates of price elasticity of cigarette and input–output multipliers, shows that a 10% increase in price will lead to an 11% reduction in cigarette consumption, which translates into annual savings of Pakistani Rupees (Rs) 16 billion by households. Reduction in cigarette consumption will allow individuals to spend their savings on other commodities. For example, spending this amount on food items will lead to a net increase of Rs 40 billion annual output of the economy.ConclusionReduction in tobacco consumption will lead to initial losses to the economy but there will be considerable gains in output, employment and income due to redistribution of tobacco expenditures.

Traffic Demand Forecast and Control in Large-Scale Activities

2012 ◽  
Vol 209-211 ◽  
pp. 998-1003
Author(s):  
Liang Zhi Zhang ◽  
Lei Jia ◽  
Mei Xia Wang
Keyword(s):  
Traffic Control ◽  
Large Scale ◽  
Control Measures ◽  
Traffic Load ◽  
Demand Forecast ◽  
Traffic Demand ◽  
The Road ◽  
Traffic Forecasting ◽  
Before And After ◽  
The Impact

In order to alleviate traffic load during large-scale activities held in cities, the concepts of traffic planning is applied in this paper. To forecast traffic demand of large-scale activities, the traditional four-stage method is imposed. Traffic forecasting model is set up in simulation tool TransCAD, and then traffic loads are gained in road around large-scale activities. Based on the result of simulate, appropriate measures are taken and re-assignment is implemented. By comparing simulation results between before and after the implementation of traffic control measures, the impact of large-scale activities to the road network and effectiveness of control measures are verified in the paper.

scholarly journals Development of the first axillary in vitro shoot multiplication protocol for coconut palms

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hannes Wilms ◽  
Dries De Bièvre ◽  
Kevin Longin ◽  
Rony Swennen ◽  
Juhee Rhee ◽  
...  
Keyword(s):  
Large Scale ◽  
Shoot Multiplication ◽  
Shoot Formation ◽  
Axillary Shoot ◽  
Axillary Shoots ◽  
Pests And Diseases ◽  
Planting Material ◽  
In Vitro Plantlets ◽  
Disease Free

AbstractThe coconut palm or “tree of life” is one of nature’s most useful plants and the demand for its fruit is increasing. However, coconut production is threatened by ageing plantations, pests and diseases. Currently, the palm is exclusively propagated via seeds, limiting the amount of planting material. A novel micropropagation method is presented, based on axillary shoot formation. Apical meristems of in vitro coconut seedlings are cultured onto Y3 medium containing 1 µM TDZ. This induces the apical meristem to proliferate through axillary shoots in ~ 27% of the initiated explants. These axillary shoots are seen as white clumps of proliferating tissue and can be multiplied at a large scale or regenerated into rooted in vitro plantlets. This innovative micropropagation method will enable the production of disease-free, high quality in vitro plantlets, which will solve the worldwide scarcity of coconut planting material.

scholarly journals Impact of the agricultural technology transfer to the production of independent palm oil smallholders: a review

Food Research ◽  
2021 ◽  
Vol 5 (S4) ◽  
pp. 110-124
Author(s):  
Syarifudin S.M. ◽  
Zareen Z.
Keyword(s):  
Technology Transfer ◽  
Palm Oil ◽  
Oil Palm ◽  
Crop Protection ◽  
Agricultural Technology ◽  
Total Output ◽  
World Population ◽  
Agricultural Practice ◽  
Good Agricultural Practice ◽  
The Impact

Oil palm is the most efficient oil crop that is vital to oil commodity due to its versatility for being a practical raw material in producing a number of commercial products globally. Therefore, the supply of palm oil is believed to increase in order to meet the growing demand of the world population. Malaysia is the second-largest palm oil exporter in South -East Asia after Indonesia with 40% of the total output is contributed by Malaysia’s smallholders. However, reports stated that the yield among smallholder’s plantations is low and eventually will affect the national Gross Domestic Products (GDP). In 2019, Malaysia’s palm oil total GDP was estimated to be 38.24 billion Malaysian Ringgit (MYR). In relation to the issue, low yield among the smallholders is believed to be caused by the lack of application and awareness of current technology available to aid plantation operation. Hence, agricultural technology transfer is the modern agricultural invention to improve oil palm production productivity. A review paper on the agricultural technology transfer was carried out to identify the impact of the technology transfer on palm oil smallholders' production. This approach encompassed the introduction of technology to smallholders, the technology transfer process and technology applications awareness for smallholders. The data was collected through reading on research papers, especially on productivity and engagement of smallholders on the understanding of the technology transfer through the questionnaire. The review concluded that smallholders had practised a good agricultural practice. However, low productivity was caused by the inadequate inputs among the farmers regarding the available technology, crop protection and management. Therefore, technology transfer and technology recommendation is proven to effectively help broaden smallholders’ inputs and knowledge to increase their socioeconomic status and plantation productivity.

scholarly journals Modelling nitrogen dynamics and distributions in the River Tweed, Scotland: an application of the INCA model

2002 ◽  
Vol 6 (3) ◽  
pp. 433-454 ◽  
Author(s):  
H. P. Jarvie ◽  
A. J. Wade ◽  
D. Butterfield ◽  
P. G. Whitehead ◽  
C. I. Tindall ◽  
...  
Keyword(s):  
Land Use ◽  
Plant Uptake ◽  
Large Scale ◽  
Agricultural Land ◽  
Agricultural Practice ◽  
Worst Case ◽  
River Flows ◽  
Good Agricultural Practice ◽  
Wide Range ◽  
Nitrate Concentrations

Abstract. The INCA (Integrated Nitrogen in Catchments) model was applied to the River Tweed in the Scottish Borders, a large-scale (4400km2), spatially heterogeneous catchment, draining a wide range of agricultural land-use types, and which contributes approximately 20% of UK river flows to the North Sea. The model was calibrated for the first four years' data record (1994 to 1997) and tested over the following three years (1998 to 2000). The model calibration and testing periods incorporated a high degree of variability in climatic conditions and river flows within the Tweed catchment. The ability of the INCA model to reproduce broad-scale spatial patterns and seasonal dynamics in river flows and nitrate concentrations suggests that the processes controlling first order variability in river water nitrate concentrations have been represented successfully within the model. The tendency of the model to overestimate summer/early autumn baseflow nitrate concentrations during dry years may be linked to the operation of aquatic plant uptake effects. It is, therefore, suggested that consideration be given to incorporating a spatially and temporally variable in-stream plant uptake term for the application of INCA to lowland eutrophic rivers. Scenarios to examine possible impacts of environmental change on nitrate concentrations on the Tweed are examined. These include the effects of (i) implementing different recommendations for fertiliser use and land use change under the Nitrate Sensitive Areas (NSA) Scheme and the Scottish Code of Good Agricultural Practice, (ii) worst case scenario changes linked to a dramatic reduction in livestock numbers as a result of a crisis in UK livestock farming and (iii) changes in atmospheric nitrogen deposition. Keywords: Nitrate, nitrogen, modelling, Tweed, INCA

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