CONTROLLING SUFETULA SPP.: A COCONUT INSECT PEST ON PEAT SOILS

2007 ◽  
Vol 43 (3) ◽  
pp. 289-299 ◽  
Author(s):  
X. BONNEAU ◽  
M. HUSNI ◽  
L. BEAUDOIN-OLLIVIER ◽  
JOKO SUSILO
Keyword(s):  
Insect Pest ◽  
Bare Soil ◽  
Cultural Control ◽  
Control Measures ◽  
Control Methods ◽  
Peat Soils ◽  
Depressive Effect ◽  
Moss Cover ◽  
Adult Insect ◽  
The Impact

We demonstrated experimentally that Sufetula, a root-mining insect, has a depressive effect on coconut yields on peat soils. The impact of the pest resulted in a shortfall in earnings that warranted taking control measures. We considered control methods suitable for rehabilitating infested mature coconut plantings and for preserving young coconut plantings. Currently, cultural control is the only effective method. It involves eliminating all identified shelters for the adult insect, i.e. fern cover and heaps of coconut waste (dry fronds and husks). The aim is to achieve totally bare soil, with moss cover that does not attract the pest, or planted with an unattractive intercrop such as pineapple.

The National Shipbuilding Research Program Welding Fume Study

2001 ◽  
Vol 17 (01) ◽  
pp. 35-39
Author(s):  
Daniel O. Chute ◽  
Bradley W. Christ
Keyword(s):  
Field Evaluation ◽  
Control Measures ◽  
Welding Fume ◽  
Control Methods ◽  
Exposure Control ◽  
Exposure Limits ◽  
Shipbuilding Industry ◽  
Worker Exposure ◽  
The Cost ◽  
The Impact

This paper presents the results of a study evaluating the impact of anticipated reductions in OSHA worker exposure limits for airborne contaminants, nickel (Ni), manganese (Mn), and hexavalent chromium (Cr6) on the shipbuilding industry. As part of the study field evaluation, air monitoring and data analysis were conducted to measure the effectiveness of a series of exposure control methods including fume extractor guns, ixed fume extraction systems, portable fume extraction systems, low fume welding wires, downdraft/backdraft tables, and fume iltration devices. Six shipyards participated in this study. The study concluded that the cost of compliance increases greatly with lower exposure limits. It was recommended that the shipbuilding industry continue to develop and evaluate feasible control measures in anticipation of revised standards.

scholarly journals Rural Farmers’ Perceptions, Knowledge and Management of Insect Pests of Fruit Vegetables in Ogbomoso Agricultural Zone of Nigeria

2014 ◽  
Vol 25 ◽  
pp. 18-28 ◽  
Author(s):  
Oladele Abiodun Olaniran ◽  
Samuel Adelani Babarinde ◽  
Adeola Foluke Odewole ◽  
Peter Ademola Aremu ◽  
Kehinde Popoola
Keyword(s):  
Management Practices ◽  
Insect Pests ◽  
Control Strategies ◽  
Insect Pest ◽  
Cultural Control ◽  
Control Methods ◽  
Rural Farmers ◽  
Planting Season ◽  
Age Category ◽  
Structured Questionnaire

Surveys were carried out in five local government areas of Ogbomoso Agricultural Zone Nigeria during planting season in 2010 to investigate rural farmers perceptions and management practices of insect pests of fruit vegetables. The survey involved 150 randomly selected farmers who were interviewed using structured questionnaire. Fruit vegetables planted by the farmers were okra, tomatoes, pepper and garden egg. Reasons given by farmers for cultivating fruit vegetables were significantly favored by age category, educational qualification, and secondary occupation of farmers (x2 = 4.757, P = 0.029). Field insect pests were perceived as the major production constraint to fruit vegetables in this zone. Majority of the farmer estimated 78.4 % rated insect pest as the most serious pest infesting fruit vegetables, the insect pests were grasshopper (Orthoptera), beetles (Coleoptera) and caterpillar (Lepidoptera). Integrated pest management module consisted basically of chemical and cultural control strategies, with weeding, shifting cultivation and crop rotation as main cultural control methods. More than 76.7 % of the farmers make use of cultural control because of unavailability and cost of chemical insecticides. Only 23.3 % had access to chemical insecticides in controlling insect pest of fruit vegetables.

scholarly journals PENGARUH FOSFIN (PH3) TERHADAP MORTALITAS HAMA GUDANG Sitophilus oryzae L. PADA KOMODITAS GANDUM

2019 ◽  
Vol 2 (1) ◽  
pp. 274-284
Author(s):  
Sarah Zulfiyah Febrianti ◽  
Suharto Suharto
Keyword(s):  
Exposure Time ◽  
Insect Pest ◽  
Sitophilus Oryzae ◽  
Control Measures ◽  
Effective Control ◽  
Climate Conditions ◽  
Triticum Spp ◽  
Adult Insect ◽  
Average Adult

 ABSTRACTWheat (Triticum spp.) is one of the commodities cereals are consumed by people in Indonesia. Indonesia climate conditions that are less in accordance with the growth and development of wheat crops affect food security of Indonesia. The imports of wheat Indonesia tend to increase from over the years. In the process, Sitophilus oryzae Linnaeus which is major insect pest of grain so that it causes damage and decrease of quality of grain. Therefore, effective control measures of this insect pest by quarantine officers are important. Phosphine solid formulations are expected to control pests S. oryzae effectively. The objectives of this study were to determine the dosage and exposure time which will were effectively kill S. oryzae on wheat commodities. S. oryzae on wheat was exposed to phosphine at 3 dosage (0.5 gr/m3, 1 gr/m3, and 1.5 gr/m3) and exposure times (6, 12, 18 and 24 hours). Moreover, mortality test of adult insect and adult insect of F1 offspring. Results showed that application of phosphine at dosage of 0.5 gr/m3, 1 gr/m3 and 1.5 gr/m3 with exposure time 18 and 24 hours completely killed 100% mortality adult insect of S. oryzae on wheat commodities. Dosage 1.5 gr/m3 with exposure time 24 hours show the average adult insect of F1 offspring as much as one tail.  Keywords: Sitophilus oryzae L., Phosphine (PH3), Wheat

scholarly journals Biorational insecticides for control of the tomato potato psyllid

2013 ◽  
Vol 66 ◽  
pp. 333-340 ◽  
Author(s):  
N. Jorgensen ◽  
R.C. Butler ◽  
J. Vereijssen
Keyword(s):  
Insect Pest ◽  
Field Trials ◽  
Control Measures ◽  
Potato Psyllid ◽  
Control Methods ◽  
Bactericera Cockerelli ◽  
Insect Pest Control ◽  
Beneficial Insects ◽  
Potato Crops ◽  
Laboratory Bioassays

Since its discovery in 2006 the tomato potato psyllid Bactericera cockerelli (ulc) (TPP) has been considered a significant pest of solanaceous crops in New Zealand resulting in an intensification of insect pest control measures often with the use of broadspectrum insecticides In the search for more sustainable control methods in outdoor potato crops several biorational insecticides were tested in laboratory bioassays to assess their effects on TPP behaviour and mortality The products tested were Organic JMS StyletOil Excel Oil EcoOil Neem 600 WP and Sap Sucker Plus Given the efficacy of JMS Stylet Oil Sap Sucker Plus and Excel Oil at reducing TPP numbers and their probing/feeding deterrent qualities these products are now being tested in a field trial The impacts of the tested biorational insecticides on beneficial insects are also being assessed in laboratory and field trials

scholarly journals A novel age-structured mosquito model for assessing the mechanisms behind vector control success

2020 ◽  
Author(s):  
Emma L Davis ◽  
T Déirdre Hollingsworth ◽  
Matt J Keeling
Keyword(s):  
Vector Control ◽  
Age Structure ◽  
Current Knowledge ◽  
Steady State Solution ◽  
Health Impact ◽  
Control Measures ◽  
Control Methods ◽  
Vector Population ◽  
Age Structured ◽  
The Impact

Abstract Background: Vector control is a vital tool utilised by malaria control and elimination programmes worldwide, and as such it is important that we can accurately quantify the expected public health impact of a range of vector control methods. There are very few previous models that consider vector control induced changes in the age-structure of the vector population and the resulting impact this will have on transmission.Methods: The steady-state solution of a novel age-structured deterministic compartmental model describing the mosquito gonotrophic cycle is analytically derived, with the age of each mosquito measured in the number of gonotrophic cycles (or successful blood meals) completed. From this model we derive analytical expressions for key transmission measures, such as the effective reproductive ratio under control, Rc, and investigate the impact of combinations of commonly used vector control methods on the age-structure of the vector population.Results: Our model output is an explicit solution that can be used to directly quantify key transmission statistics and investigate the age-structured impact of vector control. Application of this model confirms current knowledge thatadult-acting interventions, such as IRS or LLINs, can be highly effective at reducing transmission, due to the dual effects of repelling and killing mosquitoes. However, we demonstrate how larval measures can be implemented in addition to adult-acting measures to reduce Rc and mitigate the impact of waning insecticidal efficacy. We also find that mid-ranges of LLIN coverage see the largest effect of reduced net integrity on transmission.Conclusions: Whilst well-maintain adult-acting vector control measures are substantially more effective than larval-based interventions, incorporating larval control in existing LLIN or IRS programmes could substantially reduce transmission. This would most benefit areas with low coverage or poor maintenance of interventions.

On the effect of different moss species on soil erosion, percolation and carbon relocation

2021 ◽  
Author(s):  
Corinna Gall ◽  
Lena Grabherr ◽  
Martin Nebel ◽  
Thomas Scholten ◽  
Sonja M. Thielen ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Surface Runoff ◽  
Biological Soil Crust ◽  
Bare Soil ◽  
Individual Species ◽  
Sediment Discharge ◽  
Moss Species ◽  
Moss Cover ◽  
The Impact ◽  
Soil Substrates

<p>For decades, soil erosion has been a major environmental problem as it degrades the most productive soil layers, which threatens, among other things, food production worldwide. Although these effects have been known for a long time, there are still a variety of challenges to mitigating soil erosion in different ecosystems. As climate change progresses, the risk of soil loss increases, making the preparation of effective solutions very urgent. A current research focus is on the restoration of a protective soil cover following disturbances in the vegetation layer, e.g., through the reestablishment of biological soil crust communities. These are often dominated by bryophytes in humid climates. So far, several studies examined the general protective influence of bryophytes against soil erosion, however only few of them addressed how individual species affect specific erosion processes in detail.</p><p>To fill this research gap we investigated the impact of six moss species on soil erosion, percolation and carbon relocation by means of rainfall simulations. Therefore, we used topsoil substrate from four sites in the Schönbuch Nature Park in South Germany which covers different kinds of bedrock and varying soil texture and pH. Subsequently, they were sieved by 6.3 mm and filled into metal infiltration boxes (40 x 30 cm) up to a height of 6.5 cm. The moss species differ in origin (either collected in the field or cultivated in the lab) as well as growth form (pleurocarpous or acrocarpous). Rainfall simulations were performed for bare soil substrates, as well as for moss-covered soil substrates six months later and both in dry and wet conditions. Additionally, we conducted rainfall simulations with leaf and coniferous litter on bare soil substrates. During the simulations we monitored soil moisture in two position - 3 cm depth plus soil surface - with biocrust wetness probes (BWP) and quantified surface runoff, percolation and sediment discharge. Afterwards we determined carbon contents of the sediment and dissolved organic carbon in the liquid phase of runoff and percolated water.</p><p>While surface runoff was increased by 5% due to the litter cover compared to the bare soil substrate, sediment discharge decreased to 97%. Runoff rates could also be mitigated by 90 % as a result of the moss cover. Furthermore, due to the dense moss cover sediment rates were almost reduced to zero. Preliminary results show that there are differences between the moss species in terms of sediment discharge, but not in context with runoff. The analyses of carbon contents in surface runoff and the percolated water are still in progress, as is the evaluation of the BWP measurements. These outcomes will be presented at vEGU21.</p>

scholarly journals Vegetable Farmer’s Awareness and Perception of Pesticides on the Environment and Health in Eastern Sri Lanka

2019 ◽  
pp. 1-7
Author(s):  
Ponniah Sivarajah
Keyword(s):  
Sri Lanka ◽  
Pest Control ◽  
Cultural Control ◽  
Alternative Methods ◽  
Vegetable Production ◽  
Control Methods ◽  
Chi Square ◽  
Vegetable Farmers ◽  
The Impact ◽  
Impact Of Pesticides

In Sri Lanka excessive use of pesticides in paddy and vegetable farming has caused much concern in terms of its impact on the environment and humans. A study was done in Eastern Sri Lanka to find out vegetable farmer’s awareness of hazard levels of pesticides, perception of pesticide impact on the environment and their health, and awareness about different methods of pest control among farmers. A multi-staged random sample of 96 vegetable farmers in five Agrarian Service Center ranges in the Eastern Province of Sri Lanka was studied, during October to November 2017, using a structured questionnaire. Frequencies estimation and Chi Square tests were done to find relationships. The results indicated that the degree of awareness on the hazardous levels of pesticides was minimal, but their perceptions on the impacts of the pesticides on the environment, humans, animals and on food items sold was high among the vegetable farmers. There was a significant spatial variation in knowledge on hazardous level of pesticides used in vegetable production. Significant differences existed between areas studied on the perception of farmers of the impact of pesticides on humans, animals, food and environment. Most of the farmers were aware about crop rotation, chemical control and manual control methods to get rid of pests. Only a low percentage of farmers were aware about biological control, cultural control and seed treatment to curtail pest attack. There were significant spatial differences in farmers’ awareness on available pest control methods. Policy makers and institutions intervening to regulate pesticides usage need to adopt multiple strategies to create awareness on the impact of pesticides on humans and the environment, through designing policies to enhance farm extension services and to encourage adoption of alternative methods of pest control.

Factors at multiple scales influence the composition of terricolous lichen communities in temperate semi-arid sandy grasslands

2021 ◽  
Vol 53 (6) ◽  
pp. 467-479 ◽  
Author(s):  
Katalin Veres ◽  
Zsolt Csintalan ◽  
Bence Kovács ◽  
Edit Farkas
Keyword(s):  
Multiple Scales ◽  
Dominant Role ◽  
Bare Soil ◽  
Lichen Species ◽  
Calcareous Grassland ◽  
Moss Cover ◽  
The Impact ◽  
Terricolous Lichen ◽  
Sandy Grasslands ◽  
Semi Arid

AbstractInland dune ecosystems are rich in terricolous lichen species. However, these communities are sensitive to human activities, both locally and globally. Since terricolous lichens have a dominant role in semi-arid sandy grasslands, it is important to explore the composition of their communities and the environmental factors affecting them. We studied the structure of the terricolous lichen assemblages of calcareous grassland in an inland duneland ecosystem by comparing the lichen communities of arid and humid dune sides on two sites with different disturbance histories. Microcoenological data were collected according to the Braun-Blanquet method. Environmental variables include the cover of bare soil, moss, litter, herb cover and height of herbs. We investigated the relationship of these variables and the presence and absence data of terricolous lichen species to sites and dune side. We found that the site had a significant effect on species richness that might reflect the different types and severity of previous disturbance events at the studied sites. On a smaller, ‘dune’ scale, in general lower herb cover and height and a higher moss cover were characteristic of arid dune sides. Most of the frequent species were negatively affected by higher moss cover. Some lichen species were more abundant (e.g. Cladonia furcata) or found only (e.g. Xanthoparmelia subdiffluens, Gyalolechia fulgens) on arid dune sides, while others preferred (e.g. C. pyxidata) or occurred only on (e.g. Peltigera species, C. rei) humid sides. It was observed that the impact of the dune side on several variables differed between sites. The diverse microhabitat types, microclimate and landscape structure, results in species-rich and valuable terricolous lichen communities forming in inland dune ecosystems.

scholarly journals A novel age-structured mosquito model for assessing the mechanisms behind vector control success

2020 ◽  
Author(s):  
Emma L Davis ◽  
T Déirdre Hollingsworth ◽  
Matt J Keeling
Keyword(s):  
Vector Control ◽  
Age Structure ◽  
Current Knowledge ◽  
Steady State Solution ◽  
Control Measures ◽  
Control Methods ◽  
High Coverage ◽  
Transmission Potential ◽  
Age Structured ◽  
The Impact

Abstract Background: Vector control is a vital tool utilised by malaria control and elimination programmes worldwide, and as such it is important that we can accurately quantify the expected public health impact of a range of vector control methods. There are very few previous models that consider vector control induced changes in the age-structure of the vector population and the resulting impact this will have on transmission.Methods: The steady-state solution of a novel age-structured deterministic compartmental model describing the mosquito gonotrophic cycle is analytically derived, with the age of each mosquito measured in the number of gonotrophic cycles (or successful blood meals) completed. From this model we derive analytical expressions for key transmission measures, such as the effective reproductive ratio under control, Rc, and investigate the impact of commonly used vector control methods on the age-structure of the vector population.Results: We derive and analyse a novel model with an explicit solution that can be used to directly quantify key transmission statistics and investigate the age-structured impact of vector control. Application of this model confirms current knowledge that adult-acting interventions, such as IRS or LLINs, are highly effective at reducing transmission, particularly in comparison to larvicide usage at the same coverage. We also find that scaling up coverage results in a wider gap in transmission reduction between adult-active and larval-based interventions. For LLINs and IRS the effective reproductive ratio under control, Rc, decreases exponentially with coverage, whereas for larvicides the relationship is linear. We also find that mid-ranges of LLIN coverage see the largest effect of reduced net integrity on transmission.Conclusions: Well-maintained, adult-acting vector control measures are substantially more effective than larval-based action at reducing the transmission potential of the mosquito population, particularly at medium to high coverage levels.

The methodological approach for the determination of the pressure of artificial raindrops as a question of the theory of splash soil erosion

2020 ◽  
pp. 24-28
Author(s):  
Mihail Zver'kov
Keyword(s):  
Block Diagram ◽  
Methodological Approach ◽  
Control Measures ◽  
Soil Conditions ◽  
Effective Pressure ◽  
Long Distance ◽  
Splash Erosion ◽  
Rain Drops ◽  
Artificial Rain ◽  
The Impact

To the article the results of the theoretical and experimental researches are given on questions of estimates of the dynamic rate effect of raindrop impact on soil. The aim of this work was to analyze the current methods to determine the rate of artificial rain pressure on the soil for the assessment of splash erosion. There are the developed author’s method for calculation the pressure of artificial rain on the soil and the assessment of splash erosion. The study aims to the justification of evaluation methods and the obtaining of quantitative characteristics, prevention and elimination of accelerated (anthropogenic) erosion, the creation and the realization of the required erosion control measures. The paper considers the question of determining the pressure of artificial rain on the soil. At the moment of raindrops impact, there is the tension in the soil, which is called vertical effective pressure. It is noted that the impact of rain drops in the soil there are stresses called vertical effective pressure. The equation for calculation of vertical effective pressure is proposed in this study using the known spectrum of raindrops. Effective pressure was 1.4 Pa for the artificial rain by sprinkler machine «Fregat» and 5.9 Pa for long distance sprinkler DD-30. The article deals with a block diagram of the sequence for determining the effective pressure of rain drops on the soil. This diagram was created by the author’s method of calculation of the effective pressure of rain drops on the soil. The need for an integrated approach to the description of the artificial rain impact on the soil is noted. Various parameters characterizing drop erosion are considered. There are data about the mass of splashed soil in the irrigation of various irrigation machinery and installations. For example, the rate (mass) of splashed soil was 0.28…0.78 t/ha under irrigation sprinkler apparatus RACO 4260–55/701C in the conditions of the Ryazan region. The method allows examining the environmental impact of sprinkler techniques for analyzes of the pressure, caused by raindrops, on the soil. It can also be useful in determining the irrigation rate before the runoff for different types of sprinkler equipment and soil conditions.

Sign in / Sign up

Export Citation Format

Share Document