Landscape factors affecting the control of Mamestra brassicae by natural enemies in Brussels sprout

2005 ◽  
Vol 107 (2-3) ◽  
pp. 145-150 ◽  
Author(s):  
F.J.J.A. Bianchi ◽  
W.K.R.E. van Wingerden ◽  
A.J. Griffioen ◽  
M. van der Veen ◽  
M.J.J. van der Straten ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Mamestra Brassicae ◽  
Brussels Sprout ◽  
Factors Affecting ◽  
Landscape Factors

Local and landscape factors affecting tadpole diversity in subtropical Atlantic Forest streams

2019 ◽  
Vol 44 (8) ◽  
pp. 1311-1321
Author(s):  
Maria Aparecida Cristo Anciutti ◽  
Veluma Ialú Molinari De Bastiani ◽  
Jacir Dal Magro ◽  
Fabio Luiz Carasek ◽  
Ronei Baldissera ◽  
...  
Keyword(s):  
Atlantic Forest ◽  
Factors Affecting ◽  
Landscape Factors ◽  
Forest Streams

scholarly journals Ecological and Landscape Factors Affecting the Spread of European Mistletoe (Viscum album L.) in Urban Areas (A Case Study of the Kaliningrad City, Russia)

Plants ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 394
Author(s):  
Liubov Skrypnik ◽  
Pavel Maslennikov ◽  
Pavel Feduraev ◽  
Artem Pungin ◽  
Nikolay Belov
Keyword(s):  
Urban Areas ◽  
Principal Component ◽  
Viscum Album ◽  
Populus Nigra ◽  
Factors Affecting ◽  
Relative Air Humidity ◽  
Urban Territories ◽  
Green Zone ◽  
Landscape Factors ◽  
Urban Conditions

Green spaces are very important for an urban environment. Trees in cities develop under more stressful conditions and are, therefore, more susceptible to parasite including mistletoe infestation. The aim of this study was to investigate the ecological, microclimatic, and landscape factors causing the spread of European mistletoe (Viscum album L.) in urban conditions. The most numerous hosts of mistletoe were Tilia cordata (24.4%), Acer platanoides (22.7%), and Populus nigra (16.7%). On average, there were more than 10 mistletoe bushes per tree. The mass mistletoe infestations (more than 50 bushes per the tree) were detected for Populus × berolinensis, Populus nigra, and Acer saccharinum. The largest number of infected trees was detected in the green zone (city parks), historical housing estates, and green zone along water bodies. Based on the results of principal component analysis (PCA), the main factors causing the spread of mistletoe on the urban territories are trees’ age and relative air humidity. The factors reflecting environmental pollution (the content of heavy metals in the soil and the concentration of nitrogen dioxide in the air) did not statistically affect the mistletoe distribution in the study area. However, this result may be due to the heterogeneity of other parameters in the studied areas. Therefore, additional research is required to more accurately interpret the data on the relationship between environmental pollutions and distribution of mistletoe infestation of trees in urban areas.

scholarly journals Factors Affecting Tourism Destination: A Case Study in Ha Tien City, Vietnam

2021 ◽  
Vol 1 (6) ◽  
pp. 70-80
Author(s):  
Da Van Huynh ◽  
Hang Thi Thuy Tran ◽  
Trieu Quang Pham ◽  
Xuan Thanh Duong ◽  
Dong Trung Pham
Keyword(s):  
Regression Analysis ◽  
Rational Choice ◽  
Rational Choice Theory ◽  
Choice Theory ◽  
Empirical Studies ◽  
Tourist Destination ◽  
Factors Affecting ◽  
Landscape Factors ◽  
Tourism Services

On the basis of theories of tourism, services, rational choice theory and previous empirical studies, the study proposes a research framework including 6 factors affecting tourists’ decisions when choosing Ha Tien as a destination to visit. The research sample was carried out by surveying by questionnaire with 100 tourists who visited Ha Tien City. Evaluation of the reliability of the scales shows that the destination information factor has not yet ensured the reliability of the scale. Regression analysis shows that there are 3 out of 6 independent factors that most influence tourists’ decision to choose when choosing Ha Tien as a tourist destination. In which, environmental and landscape factors have the most influence on tourists’ decision to choose Ha Tien as a destination. As a result, the article proposes some solutions to contribute to attracting more and more tourists to Ha Tien City.

scholarly journals Identifying landscape factors affecting tiger decline in the Bangladesh Sundarbans

2018 ◽  
Vol 13 ◽  
pp. e00382 ◽  
Author(s):  
Abu Naser Mohsin Hossain ◽  
Antony J. Lynam ◽  
Dusit Ngoprasert ◽  
Adam Barlow ◽  
Christina Greenwood Barlow ◽  
...  
Keyword(s):  
Factors Affecting ◽  
Landscape Factors

Soil properties and landscape factors affecting maize yield under wet spring conditions in eastern Canada

2008 ◽  
Vol 99 (1) ◽  
pp. 134-144 ◽  
Author(s):  
A.C. Parent ◽  
M.C. Bélanger ◽  
L.E. Parent ◽  
R. Santerre ◽  
A.A. Viau ◽  
...  
Keyword(s):  
Soil Properties ◽  
Maize Yield ◽  
Eastern Canada ◽  
Factors Affecting ◽  
Landscape Factors

Decision trees to assess the risk of cereal aphid (Hemiptera: Aphididae) outbreaks in summer in England

1984 ◽  
Vol 74 (3) ◽  
pp. 387-398 ◽  
Author(s):  
Alan M. Dewar ◽  
Nick Carter
Keyword(s):  
Decision Trees ◽  
Natural Enemies ◽  
Field Data ◽  
Sowing Date ◽  
Aphid Species ◽  
Early Summer ◽  
Cereal Aphid ◽  
Metopolophium Dirhodum ◽  
Factors Affecting ◽  
Two Factors

AbstractRecent studies on the ecology of two cereal aphid species, Sitobion avenae (F.) and Metopolophium dirhodum (Wlk.), are reviewed. The most important factors affecting their abundance were used to construct decision trees to assess the risk of outbreaks of these species in the summer in England. These factors for S. avenae were crop sowing date, the size of the autumn migration, the severity of the winter, the size of the spring migration and the incidence of natural enemies in spring and early summer. For M. dirhodum, only the last two factors were considered as it does not occur on cereals until the spring in England. These decision trees were successfully tested using field data from 1983, when no outbreaks of either species occurred due to the effects of natural enemies.

scholarly journals Factors affecting colonization and abundance of Aphis gossypii glover (hemiptera: aphididae) on okra plantations

2007 ◽  
Vol 31 (2) ◽  
pp. 337-343 ◽  
Author(s):  
Germano Leão Demolin Leite ◽  
Marcelo Picanço ◽  
José Cola Zanuncio ◽  
Marcos Rafael Gusmão
Keyword(s):  
Organic Compounds ◽  
Natural Enemies ◽  
Aphis Gossypii ◽  
Leaf Nitrogen ◽  
Aphid Population ◽  
Mortality Factors ◽  
Total Rainfall ◽  
Bottom Part ◽  
Factors Affecting ◽  
Aphis Gossypii Glover

The control of Aphis gossypii Glover (Hemiptera: Aphididae) on okra Abelmoschus esculentus (L.) (Malvaceae) consist primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to determine the effects of predators and parasitoids, height of canopy, plant age, leaf areas, organic compounds leaves, levels of leaf nitrogen and potassium, density of leaf trichomes, total rainfall and median temperature on attack intensity of A. gossypii on two successive A. esculentus var. Santa Cruz plantations. Monthly number estimates of A. gossypii and natural enemies (visual inspection) occurred on bottom, middle and apical parts of 30 plants/plantation (one leaf/plant). Plants senescence, leaf areas and natural enemies, mainly Adialytus spp., spiders and Coccinellidae, were some of the factors that most contributed to aphid reduction. A higher number of aphids was found on the bottom part than medium and apical parts of okra plants. Total rainfall can reduce the aphid population. Trichomes non-glandular or low density, organic compounds leaves and levels of N and K were not important for reducing aphid population.

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