scholarly journals Incidence of Pests and Diseases in Tree Nurseries and Plantations in Kimondi Forest, Nandi County, Kenya

2021 ◽  
Vol 3 (1) ◽  
pp. 18-28
Author(s):  
Joseph Atanga Ondieki ◽  
Peter Sirmah ◽  
Joseph Hitimana
Keyword(s):  
Insect Pests ◽  
Forest Products ◽  
Signs And Symptoms ◽  
Growth Conditions ◽  
Eucalyptus Species ◽  
Cupressus Lusitanica ◽  
Pests And Diseases ◽  
High Incidence ◽  
The Government ◽  
Increasing Demand

Increasing demand for wood is putting pressure on forest resources that are equally under threat from insect pests and diseases. Reported average annual forest loss stands at 0.2% globally, 0.8% in Africa, and 1.6% in Kenya. To meet the increasing demand for forest products in Kenya, the government and private sector have established plantations of non-native tree species dominated by Eucalyptus species, Cupressus lusitanica, and Pinus patula. To ensure successful forest plantation establishment and management schemes, there is a need for sufficient knowledge and understanding of tree growth conditions and threats including pests and diseases. This study aimed at determining the incidence of plantation and tree nurseries in Kimondi Forest, Kenya. Tree plantations were mapped into 2.5 Ha rectangular portion transects parallel to the forest roads.  In randomly selected portions, observations were carried out for disease and pest signs and symptoms on various tree parts (leaves, stem, roots, fruits, and twigs). In the tree nurseries, 3 m × 1 m rectangular quadrants were placed on seedling beds and similar observations were made. Collected data indicated a high incidence of nursery seedling pests (5.3 % leaves and 5.1%  stems) on Eucalyptus species and least on P. patula (2.4% leaves and 3% stems). Higher incidence of plantation pests (35.0% leaves of Eucalyptus sps.) and least on P. patula stems (1.2%) were recorded. On the other hand, twelve (12.0%) of C. lusitanica and (1.8%) Eucalyptus species plantation twigs were infested by pests. A high incidence of nursery seedling disease (9.8%) was observed on C. lusitanica leaves and least on P. patula stems (3.6%). Higher incidence of plantation diseases (32 %) on leaves of  Eucalyptus sps. and least on C. lusitanica stem (1.4%) was recorded. In both tree nurseries and plantations, roots and fruits remained free from pests and disease. Major tree pests and diseases identified in Kimondi forests include (Human, wildlife, livestock, Cinara cupressi, Gonipterus scutellatus, Pinus pini, and Leptocybe invasa) and (damping-off, Fusarium wilt, Botryosphaeria canker, cypress canker, and Mycosphaerella spp.) respectively. These results suggest a need for regular monitoring and intervention measures to control pest and disease infestation in the Kimondi forest.

scholarly journals Current and Emerging Pests and Diseases of Cucumber (Cucumis sativus L.) in Africa

2021 ◽  
Author(s):  
Olawale Arogundade ◽  
Titilayo Ajose ◽  
Joshua Olumide Matthew ◽  
Itunu Adeyemi Osijo
Keyword(s):  
Cucumis Sativus ◽  
Heavy Rainfall ◽  
Insect Pests ◽  
Extreme Temperatures ◽  
Cucumis Sativus L ◽  
Pests And Diseases ◽  
Humid Condition ◽  
High Incidence ◽  
The Tropics

The place of cucumber (Cucumis sativus L.) in Africa was considered insignificant for years due to its previously assumed limited uses. However, it has now gained recognition as one of the important market vegetables in the tropics because of the continued awareness of the numerous health benefits attached to its consumption. This has progressively affected its cultivation and thereby, increased outbreak of diseases and insect pests of the crop. High incidence of insect and disease infestations occur in Cucumis sativus L. due to extreme temperatures, heavy rainfall and high humid condition resulting there from, causing huge losses through reduction in yield, lowered quality of harvested produce and increased cost of production. More than 30 pests and diseases are known to contribute to the losses recorded on the crop in Africa, some of which will be discussed in this chapter.

scholarly journals Efecto de diferentes concentraciones de creosota líquida en la germinación de genotipos de tomate (Lycopersicon esculentum Mill.)

2017 ◽  
Vol 4 (1) ◽  
pp. 86-91
Author(s):  
Clotilde Andrade Varela ◽  
Lady Rodríguez ◽  
Antonio Mora
Keyword(s):  
Lycopersicon Esculentum ◽  
Insect Pests ◽  
Abiotic Factors ◽  
Annual Production ◽  
Pests And Diseases ◽  
Lycopersicon Esculentum Mill ◽  
Laboratory Conditions ◽  
High Incidence ◽  
Santa Elena ◽  
Tomato Genotypes

En la provincia de Santa Elena, Ecuador, la producción anual de tomate riñón representa el 26,3 % del total nacional y, de acuerdo al INEC, en el año 2012 toda la cosecha se destinó a la venta; pero a partir de esa fecha, la superficie de siembra en las zonas productoras ha disminuido debido, principalmente, a factores abióticos como la sequía y la salinidad, que provocan alta incidencia de insectos-plaga y enfermedades. Bajo esta premisa, el presente estudio evaluó la germinación de tres genotipos de tomate bajo el efecto de cinco concentraciones de creosota líquida, en condiciones controladas de laboratorio, con el fin de obtener genotipos con características de tolerancia a las principales plagas que afectan al cultivo. Se consideró el porcentaje de germinación desde el día tres al 20, de acuerdo a la emergencia de cada uno en las diferentes concentraciones. El experimento fue llevado en un DCA en arreglo factorial 5x3, utilizando 100 semillas certificadas por tratamiento. Los resultados del ANDEVA revelaron diferencias estadísticas significativas en germinación al 1% de probabilidades para la interacción Genotipos por Concentraciones, destacándose G3 por germinar un 5% en la concentración más alta al día 20 de la evaluación.Abstract In the province of Santa Elena, Ecuador, the annual production of kidney tomato represents 26.3% of the national total and, according to INEC, in 2012 all the harvest was destined for sale; but from that date on, the planting area in the producing areas has decreased, mainly due to abiotic factors such as drought and salinity, which cause a high incidence of insect-pests and diseases. Under this premise, the present study evaluated the germination of three tomato genotypes under the effect of five concentrations of liquid creosote, under controlled laboratory conditions, in order to obtain genotypes with tolerance characteristics to the main pests that affect the crop. The percentage of germination was considered from day three to 20, according to the emergence of each one in the different concentrations. The experiment was carried out in a DCA in factorial arrangement 5x3, using 100 seeds certified by treatment. The results of the ANDEVA revealed statistically significant differences in germination at 1% of the probabilities for the interaction Genotypes by concentrations, standing out G3 for germinating 5% in the highest concentration at day 20 of the evaluation.

Eco-smart pest management in rice farming: prospects and challenges

2019 ◽  
Vol 56 (Special) ◽  
pp. 143-155
Author(s):  
SD Mohapatra ◽  
R Tripathi ◽  
Anjani Kumar ◽  
Suchismita Kar ◽  
Minati Mohapatra ◽  
...  
Keyword(s):  
Insect Pests ◽  
Mobile Apps ◽  
Insect Species ◽  
Economic Damage ◽  
Pests And Diseases ◽  
Pest Damage ◽  
Disruptive Technologies ◽  
Hyper Spectral ◽  
Rice Pest ◽  
Computer Based

The insect problem is accentuated in intensive rice cropping where the insects occur throughout the year in overlapping generations. Over 800 insect species damaging rice in one way or another, although the majority of them do very little damage. In India, about a dozen of insect species are of major importance but the economic damage caused by these species varies greatly from field to field and from year to year. Insect pests cause about 10-15 per cent yield losses. Farmers lose an estimated average of 37% of their rice crop to insect pests and diseases every year. This review focuses on precision farming tools being used in rice pest and diseases management viz., forecasting model for real-time pest-advisory services, hyper-spectral remote sensing in pest damage assessment, computer-based decision support system, disruptive technologies (mobile apps).

Modeling the effect of skidded timber bunches on forest soil compaction

2020 ◽  
pp. 154851292097870
Author(s):  
Igor Grigorev ◽  
Olga Kunickaya ◽  
Albert Burgonutdinov ◽  
Olga Burmistrova ◽  
Varvara Druzyanova ◽  
...  
Keyword(s):  
Calculated Data ◽  
Forest Products ◽  
Permafrost Soil ◽  
Negative Consequences ◽  
Limit Values ◽  
Cryolithic Zone ◽  
Tree Length ◽  
Solid Soil ◽  
Increasing Demand ◽  
Compaction Processes

An increasing demand for forest products incites a large number of log transportation operations, which may lead to negative consequences for the soil and the ecosystem as a whole. This paper presents a mathematical model to estimate the soil deformation and compaction processes under the influence of individual components of the skidding system, such as the forwarder, limbs, butts, and tops of tree-lengths in high latitudes, permafrost soil, and forests of the cryolithic zone. The effectiveness of the proposed model was evaluated according to experimental results. Comparative analysis showed that the calculated data differ from the experimental data by no more than 10%. The deformation of the soil by the bunch of tree-length logs occurs due to shearing processes. It has been established that the initial vertical stress exceeds the radial stress by 30–40%. The result of estimating the dependency of the shelterbelt width on the number of tree-length logs showed that the limit values for logs amount to 4–6 units for the mild, medium, and solid soil categories. The obtained results and the developed model will allow for a qualitative and quantitative assessment of the technological impact on the soil during the projecting of maps for logging operations.

scholarly journals Spatial Proximity of ‘Ataulfo’ to ‘Haden’ Cultivar Increases Mango Yield and Decreases Incidence of Nubbins

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 450
Author(s):  
Rodrigo Lucas-García ◽  
Víctor Rosas-Guerrero ◽  
Lorena Alemán-Figueroa ◽  
R. Carlos Almazán-Núñez ◽  
Juan Violante-González ◽  
...  
Keyword(s):  
Lower Incidence ◽  
International Market ◽  
Spatial Proximity ◽  
Self Incompatibility ◽  
Total Income ◽  
High Incidence ◽  
Increasing Demand ◽  
Economic Income

Mexico is the leading exporter of mangos worldwide, and ‘Ataulfo’ is one of the most popular cultivars. However, their production has dramatically dropped in recent years due to the high incidence of nubbins. One of the possible causes is the presence of a delayed self-incompatibility found in this cultivar; thus, proximity to compatible cultivars may help to reduce this incidence. Nevertheless, there is a lack of studies that have rigorously tested this hypothesis in this cultivar. For two consecutive years, the present study evaluated the incidence of nubbins, as well as the quality and quantity of commercial fruits of ‘Ataulfo’ trees located at 10, 30, and 50 m away from ‘Haden’ cultivar. Additionally, the yield and economic income of different planting designs were estimated. During both sampling periods, our results clearly indicated that at 10 m away from ‘Haden’ individuals, ‘Ataulfo’ trees presented a lower incidence of nubbins and higher production of commercial fruits, and higher yield and total income per hectare than at 30 or 50 m away from them. These results indicate that planting designs of ‘Ataulfo’ trees located 10 m away from ‘Haden’ will help to satisfy the increasing demand for mangos of this cultivar in the international market.

MANAGEMENT OF INSECT PESTS AND DISEASES OF LITCHI AND LONGAN IN CHINA

2010 ◽  
pp. 621-626 ◽  
Author(s):  
H.Q. Hu ◽  
J. Chen ◽  
Z.J. Cai ◽  
R.J. Wu ◽  
X.X. Wei ◽  
...  
Keyword(s):  
Insect Pests ◽  
Pests And Diseases

scholarly journals Genetic diversity in Australian Cedar genotypes selected by mixed models

2012 ◽  
Vol 36 (2) ◽  
pp. 171-179 ◽  
Author(s):  
Rulfe Tavares ◽  
Alexandre Pio Viana ◽  
Deborah Guerra Barroso ◽  
Antonio Teixeira do Amaral Júnior
Keyword(s):  
Genetic Diversity ◽  
Mixed Models ◽  
Forest Products ◽  
Raw Material ◽  
Morphological Data ◽  
Technical Improvement ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Toona Ciliata ◽  
Increasing Demand

The increasing demand for raw material for multiple uses of forest products and by-products has attracted the interest for fast growing species, such as the Australian Cedar (Toona ciliata), which presents high productive and economic potential. The present work aimed at estimating genetic diversity by DNA markers and morphological traits supported for the mixed models. The following traits were measured and genotypes were sampled randomly in different areas: diameter at breast height, height, cylindrical volume, diameter, distance between nodes and crown diameter. Twelve RAPD primers were used and generated a total of 91 marks, 82 of which were polymorphic. The high percentage of polymorphic markers, 90.10%, demonstrated that discrimination in this species is efficient, but it yet little studied, for this case we can find the extent of the genetic basis for the application of technical improvement. The assessment of genetic diversity by the UPGMA method using the binary and morphological data provided the expression of genetic dissimilarities among the accessions evaluated, optimizing the perception of this divergence. The use of mixed models was efficient to assess combined genetic diversity to optimize the selection of genotypes with divergent genetic values for diameter at breast height.

scholarly journals Innovations in the Forest Products Industry: The Malaysian Experience

2013 ◽  
Vol 41 (2) ◽  
pp. 601 ◽  
Author(s):  
Jegatheswaran RATNASINGAM ◽  
Lim Tau WAI ◽  
Ganesh THANASEGARAN ◽  
Florin IORAS ◽  
Cristina VACALIE ◽  
...  
Keyword(s):  
Value Chain ◽  
Raw Materials ◽  
Forest Products ◽  
Poor Quality ◽  
Policy Framework ◽  
Forest Products Industry ◽  
Industrial Enterprises ◽  
Lack Of Information ◽  
The Government ◽  
Market Needs

The forest products industry is an important socioeconomic sector to many developing countries, both in terms of foreign exchange earnings and employment. In the case of Malaysia, the industry has been one of the fastest growing manufacturing sectors in the country, driven primarily by comparative advantages derived from factor inputs. However, with increasing competition from other cheaper producing nations particularly China and Vietnam, the Malaysian forest products industry is forced to transform and move along the value-chain through innovation and value-addition. Although the government has played a pivotal role in providing a broad policy framework to support value-adding and innovative activities, success on the ground has been limited. The creativity environment, which is plagued with by low-wage economy, coupled with limited network between research, market and industrial enterprises have stifled innovation within the industry. The lack of information and the poor quality human capital has also contributed to the limited innovation within the forest products industry in the country. Against this background, most innovation within the industry is confined to the realms of alternative raw materials, with minimal technological and design variations. Although extensive research and development activities are undertaken, the commercialization potential of the research outputs is limited due to being not market-driven. Inevitably, innovation in the forest products sector must be based on market-needs and must be driven through technological and design change in order to ensure long-term competitiveness.

scholarly journals Gangguan Hutan di KPH Kuningan Divisi Regional Jawa Barat dan Banten

2019 ◽  
Vol 10 (3) ◽  
pp. 159-165
Author(s):  
Ati Dwi Nurhayati ◽  
Liana Arhami
Keyword(s):  
Forest Fires ◽  
Forest Disturbance ◽  
Forest Products ◽  
Forest Disturbances ◽  
Community Based ◽  
Forest Protection ◽  
Pests And Diseases ◽  
Legal Remedies ◽  
Preventive Actions ◽  
And Control

Forest protection is an effort to prevent and control the destruction of forests, forest areas, and forest products caused by human actions, livestock, fires, pests and diseases. The aims of this research are to identify the types of forest disturbance especially those caused by humans and physically, analyze the factors causing forest disturbance, and analyze efforts to control forest disturbance at KPH Kuningan. Forest disturbances that occurred in the KPH Kuningan during 2010-2014 included: timber theft, forest fires, forest encroachment, and natural disasters. The background of forest disturbance in the Kuningan KPH is mainly due to the socio-economic conditions of the community around the forest that are still low. Strategic actions taken to prevent forest disturbance at the KPH Kuningan are to take pre-emptive actions in the form of counseling and establish good relations between officers and the community through social communication and Community Based Forest Management (PHBM), preventive actions in the form of patrols and safeguards against forest potential, and repressive actions in the form of legal remedies against the perpetrators. Key words: cause of forest disturbance, type of forest disturbance, forest disturbance control

scholarly journals Containing the High Incidence of COVID-19 in the Urban Slums of Nairobi: The Case of Kibera

2020 ◽  
Vol 3 (3) ◽  
pp. p86
Author(s):  
Amb. Dr. John O. Kakonge
Keyword(s):  
Community Leadership ◽  
Urban Slums ◽  
General Assembly ◽  
Sustainable Development Goal ◽  
Youth Groups ◽  
United Nations General ◽  
High Incidence ◽  
United Nations General Assembly ◽  
The Government ◽  
Novel Coronavirus

Globally, urban slums (in most cases, informal settlements) have been hit badly by novel coronavirus (COVID-19). The reasons for this include the cramped living conditions that make social distancing impossible, and high levels of poverty and unemployment that make masks and clean water for hand washing unaffordable to many slum residents. This paper makes the case for upgrading Kibera, which is long overdue. The United Nations General Assembly endorsed the upgrading of urban slums as a priority Sustainable Development Goal in 2015. To win the war against coronavirus in Kibera, the Government should adopt a bottom-up approach, using the existing community leadership and youth groups, as opposed to a top-down approach. Given the increasing number of positive cases of coronavirus in Kibera, the Government must apply a selective lockdown, as it did in Eastleigh, Mandera and old town Mombasa. Winning the war in Kibera ultimately depends not only on Government efforts, but also on the commitments of local communities and individual residents.

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