A global climatic risk assessment of pitch canker disease

2009 ◽  
Vol 39 (11) ◽  
pp. 2246-2256 ◽  
Author(s):  
Rebecca J. Ganley ◽  
Michael S. Watt ◽  
Lucy Manning ◽  
Eugenia Iturritxa
Keyword(s):  
Strong Association ◽  
Climatic Conditions ◽  
Pitch Canker ◽  
Global Risk ◽  
Climate Conditions ◽  
Canker Disease ◽  
Forest Industries ◽  
Commercial Species ◽  
Pinus Spp ◽  
Predicted Risk

Pitch canker is a devastating disease of Pinus spp. and Pseudotsuga menziesii (Mirb.) Franco. The pathogen responsible for this disease, Fusarium circinatum Nirenberg & O'Donnell, has spread to many countries within the last three decades. The susceptibility of the widely planted commercial species Pinus radiata D.Don to this pathogen has been of concern to pine forest industries worldwide. Using the process-based distribution program CLIMEX, the global risk of pitch canker establishment was predicted based on a number of climatic variables. The predicted risk of pitch canker establishment by CLIMEX fit well with regions known to have the disease, such as the southeastern United States and Spain. Conversely, the model predicted that the climate in California was not optimal for pitch canker, which fits with the observed lower frequency of natural infections and the strong association with insects in this region. Likewise, Chile, which is known to have F. circinatum in the nurseries but not in the plantation forests, was also predicted to have marginal to suitable climatic conditions for pitch canker establishment. Regions of China, Brazil, Australia, and New Zealand were predicted to have optimal climate conditions for disease establishment. Thus, continued strict quarantine regulations are recommended to prevent the establishment and spread of this pathogen in these countries.

scholarly journals Outbreak of Pitch Canker Caused by Fusarium circinatum on Pinus spp. in Northern Spain

Plant Disease ◽  
2005 ◽  
Vol 89 (9) ◽  
pp. 1015-1015 ◽  
Author(s):  
E. Landeras ◽  
P. García ◽  
Y. Fernández ◽  
M. Braña ◽  
O. Fernández-Alonso ◽  
...  
Keyword(s):  
Intergenic Spacer ◽  
Morphological Identification ◽  
Pitch Canker ◽  
Fusarium Circinatum ◽  
Northern Spain ◽  
Centraalbureau Voor ◽  
Canker Disease ◽  
Intergenic Spacer Region ◽  
Appl Environ ◽  
Pinus Spp

During the winter of 2003-2004, dieback symptoms were observed on Pinus radiata and P. pinaster in pine nurseries in Asturias (northern Spain). Small groups of affected seedlings appeared randomly distributed throughout the nurseries. The seedlings died rapidly, showing basal needle dieback, stem lesions, resin exudations, and wilting. Isolations from infected material onto potato dextrose agar (PDA) supplemented with 0.5 mg/ml of streptomycin sulfate and Komada's medium consistently yielded Fusarium sp. cultures. The isolates were transferred to PDA and Spezieller Nährstoffarmer agar and incubated at 25°C for 10 days with a 12-h photoperiod. The cultures were identified as Fusarium circinatum Nirenberg & O'Donnell (= Fusarium subglutinans Wollenweb. & Reinking), causal agent of pitch canker disease, on basis of the presence of polyphialides and characteristic sterile, coiled, hyphae (2). To further confirm their identity, a polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) based on histone H3 gene sequences (4) and a test based on the F. circinatum-specific primers, CIRC1A-CIRC4A, which amplifies a 360-bp DNA fragment of the intergenic spacer region of the nuclear ribosomal operon (3), were used. Results obtained with both techniques confirmed the morphological identification of the cultures. A representative culture has been placed in the Centraalbureau voor Schimmelcultures (CBS 117843). The pathogen was isolated only from seedlings of P. radiata and P. pinaster. Other species such as P. nigra, P. sylvestris, and Pseudotsuga menziesii, which were also grown in these nurseries, did not show symptoms. Pathogenicity was confirmed by inoculating 6- to 9-month-old P. radiata and P. pinaster seedlings. Small strips of bark (10 × 1 mm) were cut from the stems and similar sized pieces of PDA colonized by F. circinatum were placed in contact with the open wounds and covered with parafilm. Basal needle dieback was observed 10 days after inoculation that resulted in wilting of the seedlings. F. circinatum was reisolated from the affected stems fulfilling Koch's postulates. Later in the year, symptoms of pitch canker were also observed on 20-year-old P. radiata in one forest plantation in Cantabria (northern Spain). Infected branches and shoots of the trees exudated abundant resin, resulting in resinous cankers. The needles, distal to branch tip infections, wilt, fade to yellow then red, and fall from the tree. Affected trees showed noticeable crown dieback. The isolations from the cankers also yielded F. circinatum cultures that were identified as described above. Although a nonrefereed report appeared in 1998 (1), to our knowledge, this is the first report of F. circinatum on P. radiata and P. pinaster in Spain and in Europe. References: (1) L. D. Dwinell et al. Int. Congr. Plant Pathol. 7th. 3:9, 1998. (2) H. I. Nirenberg and K. O'Donnell. Mycologia 90:434, 1998. (3) W. Schweigkofler et al. Appl. Environ. Microbiol. 70:3512, 2004. (4) E. T. Steenkamp et al. Appl. Environ. Microbiol. 65:3401, 1999.

An initial assessment of genetic relationships among populations of Fusarium circinatum in different parts of the world

2000 ◽  
Vol 78 (6) ◽  
pp. 709-717 ◽  
Author(s):  
Karen Wikler ◽  
Thomas R Gordon
Keyword(s):  
Genetic Relationships ◽  
Initial Assessment ◽  
Multilocus Genotype ◽  
Pitch Canker ◽  
Fusarium Circinatum ◽  
Canker Disease ◽  
Vegetative Compatibility Groups ◽  
Tree Disease ◽  
Genotype Frequencies ◽  
Pinus Spp

Fusarium circinatum Nirenberg & O'Donnell, the fungus responsible for pitch canker disease, is a destructive pathogen of Pinus spp. Pitch canker was first described in 1946 in the southeastern United States, and since 1987 has been reported in numerous other locations including California, Mexico, Japan, and South Africa. To make a preliminary assessment of relationships between populations of F. circinatum in these different locations, we compared allele and genotype frequencies based on eight polymorphic regions of DNA from 76 isolates of the fungus. Patterns of relatedness indicate that the California and Japanese populations of the fungus share lineages with the southeastern U.S.A. population. Genetic diversity is highest in Mexico, implicating it as the center of origin for the fungus. The association of multiple vegetative compatibility groups with a common multilocus genotype suggests that vegetative compatible group diversity may be generated by mutation, rather than through recombination resulting from sexual reproduction.Key words: genomic subtraction, tree disease, genetic distance.

scholarly journals Effect of Pavement Friction Factors on Skid Resistance of Highway Pavements using Prediction Models

2019 ◽  
Vol 8 (9) ◽  
pp. 1184-1190
Keyword(s):  
Surface Texture ◽  
Prediction Models ◽  
Strong Association ◽  
Asphalt Mixture ◽  
Climatic Conditions ◽  
Contact Friction ◽  
Significant Feature ◽  
Skid Resistance ◽  
Climate Conditions ◽  
Form Type

There are many features for road pavements, in which the most significant feature is skid resistance. Skid resistance is referred to as the contact (friction) among the pavement surface and automobile tires. Essentially, this feature is vital to guarantee adequate road secureness and it takes a fundamental part during specific climatic conditions. The aim of this research is targeted at distinguishing the primary attributes that impact skid resistance, so that the rates of traffic collisions that occur as a result of insufficient skid resistance specifically in wet climate conditions, are minimized. Throughout this research, designs to calculate the association of surface texture form, automobile velocity, tire type and the type of asphalt mixture on skid resistance were created and applied to evaluate the significance of each attribute as well as enhancing the secureness of roads. Hence, the attributes influencing skid resistance were chosen and evaluated utilizing the SPSS program. Also, the British Pendulum Skid Resistance Tester was utilized in order to evaluate the skid resistance of various surface textures. The outcomes obtained by this study proved that there is a strong association among surface texture, wheel form, type of mixture and automobile velocity, where R2 =96.5%. Moreover, the outcomes advocated the necessity of applying operating method designs to minimize duration and exertion as well as computing the influence of these attributes on skid resistance. The ingenuity of this research is in its concept which advocates that the manipulation of skid resistance operation method results in enhanced road security and minimizes collisions, which respectively diminishes fatality rates.

Ecological specificities of the interaction between animal breeding and climate changes, caused by greenhouse gas emissions

2017 ◽  
Vol 4 (3) ◽  
pp. 62-72
Author(s):  
O. Zhukorsky ◽  
O. Nykyforuk ◽  
N. Boltyk
Keyword(s):  
Greenhouse Gases ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Climatic Conditions ◽  
Animal Breeding ◽  
Gas Emissions ◽  
Climate Conditions ◽  
Emissions Inventory ◽  
Theoretical Substantiation ◽  
Global Problems

Aim. Proper development of animal breeding in the conditions of current global problems and the decrease of anthropogenic burden on environment due to greenhouse gas emissions, caused by animal breeding activity, require the study of interaction processes between animal breeding and external climatic conditions. Methods. The theoretical substantiation of the problem was performed based on scientifi c literature, statistical informa- tion of the UN Food and Agriculture Organization and the data of the National greenhouse gas emissions inventory in Ukraine. Theoretically possible emissions of greenhouse gases into atmosphere due to animal breeding in Ukraine and specifi c farms are calculated by the international methods using the statistical infor- mation about animal breeding in Ukraine and the economic-technological information of the activity of the investigated farms. Results. The interaction between the animal breeding production and weather-and-climate conditions of environment was analyzed. Possible vectors of activity for the industry, which promote global warming and negative processes, related to it, were determined. The main factors, affecting the formation of greenhouse gases from the activity of enterprises, aimed at animal breeding production, were characterized. Literature data, statistical data and calculations were used to analyze the role of animal breeding in the green- house gas emissions in global and national framework as well as at the level of specifi c farms with the consid- eration of individual specifi cities of these farms. Conclusions. Current global problems require clear balance between constant development of sustainable animal breeding and the decrease of the carbon footprint due to the activity of animal breeding.

Potential for outcrossing in an apparently asexual population ofFusarium circinatum, the causal agent of pitch canker disease

Mycologia ◽  
2000 ◽  
Vol 92 (6) ◽  
pp. 1085-1090 ◽  
Author(s):  
Karen Wikler ◽  
Thomas R. Gordon ◽  
Sharon L. Clark ◽  
Michael J. Wingfield ◽  
Henriette Britz
Keyword(s):  
Causal Agent ◽  
Pitch Canker ◽  
Asexual Population ◽  
Canker Disease

scholarly journals Relationship between Relative Maturity and Grain Yield of Maize (Zea mays L.) Hybrids in Northwest New Mexico for the 2003–2019 Period

Agriculture ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 290
Author(s):  
Koffi Djaman ◽  
Curtis Owen ◽  
Margaret M. West ◽  
Samuel Allen ◽  
Komlan Koudahe ◽  
...  
Keyword(s):  
New Mexico ◽  
Grain Yield ◽  
Sprinkler Irrigation ◽  
Growing Season ◽  
Climatic Conditions ◽  
Agricultural Science ◽  
Production Optimization ◽  
Science Center ◽  
Early Season ◽  
Climate Conditions

The highly variable weather under changing climate conditions affects the establishment and the cutoff of crop growing season and exposes crops to failure if producers choose non-adapted relative maturity that matches the characteristics of the crop growing season. This study aimed to determine the relationship between maize hybrid relative maturity and the grain yield and determine the relative maturity range that will sustain maize production in northwest New Mexico (NM). Different relative maturity maize hybrids were grown at the Agricultural Science Center at Farmington ((Latitude 36.69° North, Longitude 108.31° West, elevation 1720 m) from 2003 to 2019 under sprinkler irrigation. A total of 343 hybrids were grouped as early and full season hybrids according to their relative maturity that ranged from 93 to 119 and 64 hybrids with unknown relative maturity. The crops were grown under optimal management condition with no stress of any kind. The results showed non-significant increase in grain yield in early season hybrids and non-significant decrease in grain yield with relative maturity in full season hybrids. The relative maturity range of 100–110 obtained reasonable high grain yields and could be considered under the northwestern New Mexico climatic conditions. However, more research should target the evaluation of different planting date coupled with plant population density to determine the planting window for the early season and full season hybrids for the production optimization and sustainability.

Human occupation strategies and related environmental-climate during the middle and late Holocene in central Pampas of Argentina

The Holocene ◽  
2018 ◽  
Vol 29 (2) ◽  
pp. 244-261 ◽  
Author(s):  
Pablo G Messineo ◽  
Marcela S Tonello ◽  
Silvina Stutz ◽  
Alfonsina Tripaldi ◽  
Nahuel Scheifler ◽  
...  
Keyword(s):  
Late Holocene ◽  
Specific Activity ◽  
Climatic Conditions ◽  
Hard Material ◽  
Human Occupation ◽  
Climate Conditions ◽  
Lithic Assemblage ◽  
Depositional Rate ◽  
Archeological Site ◽  
Middle And Late Holocene

The main objective of this work is to generate and integrate interpretations of human occupation strategies and inferences of the environmental-climatic conditions in the central Pampas during the middle and late Holocene. We present a novel archeological–geological–paleoecological analysis in the area of the Cabeza de Buey lake, placed in an aeolian landscape. During the middle Holocene, two events of human occupations were recognized at Laguna Cabeza de Buey 2 archeological site. Both events present a small amount of lithic materials, a low diversity of tools and activities developed with them (principally hard material), and the hunting and primary processing of artiodactyls. These evidences suggest a locus of specific activity associated with an ephemeral human settlement under climate conditions drier than present and the presence of small, brackish, and shallow water bodies. For the late late Holocene, the hunter-gatherer occupation has a higher depositional rate of lithic assemblage, stones with diverse origins, presence of pottery fragments, a great lithic tool diversity, knapping techniques, and activities developed with these tools (processing wood, bone, hide, non-woody plant, and soft material). These evidences reveal an occupation with a higher degree of recurrence represented by a locus of multiple activities associated with a more stable landscape, such as an environment of dunes fixed by grass vegetation, and the establishment of a permanent water body. The different environmental characteristics for the middle and late Holocene in this area promoted that human groups develop two different patterns of mobility, settlement and use of space.

scholarly journals Potential of Sunflower-Legume Intercropping: A Way Forward in Sustainable Production of Sunflower in Temperate Climatic Conditions

2021 ◽  
Author(s):  
Brankica Babec ◽  
Srđan Šeremešić ◽  
Nada Hladni ◽  
Nemanja Ćuk ◽  
Dušan Stanisavljević ◽  
...  
Keyword(s):  
Red Clover ◽  
Climatic Conditions ◽  
Sustainable Production ◽  
Oilseed Crop ◽  
Common Vetch ◽  
General Belief ◽  
Climate Conditions ◽  
Sole Crop ◽  
Sole Cropping ◽  
Almost All

Changing climate conditions coupled with the transformations of cultivation practices and land use in sole crop-based sunflower production may significantly decline yield stability of this oilseed crop. Given that sunflower takes the third place in the world oilseed market, with 45 million tons per year, and in the fourth place in vegetable oil production, it is necessary to adapt production technologies toward sustainable agriculture. Considering that, the goal of the research was to analyze and beneficial sustainable production technology of sunflower in intercropping systems. A four-year trial was conducted in Serbia’s agroecological rain-fed conditions (45°34’23.2"N 19°86’18.9"E) using a split-plot design. Two oil types and one confectionary sunflower hybrid were intercropped with common vetch, red clover and alfalfa. Analyses showed that intercropping of sunflower with common vetch resulted in the decrease in almost all sunflower trait values. Also, sunflower × alfalfa intercropping provided to be the most appropriate. The yield of NS Gricko and Rimi PR were statistically on the same level with sole cropping, while alfalfa biomass had better results when intercropped with NS Gricko as compared to sole cropping. Concerning the general belief that yields are more stable in intercropping than in sole crop, further research in this respect is needed, in addition to the research of time and method of sowing.

scholarly journals PRODUCTIVITY OF NEW MAIZE HYBRIDS IN CONDITIONS OF THE URALS

2020 ◽  
Vol 17 (35) ◽  
pp. 1175-1185
Author(s):  
Raphael ISMAGILOV ◽  
Еlena SOTCHENKO ◽  
Bulat AKHIYAROV ◽  
Damir ISLAMGULOV ◽  
Razit NURLYGAJANOV
Keyword(s):  
Nutritional Value ◽  
Climatic Conditions ◽  
Farm Animals ◽  
Primary Concern ◽  
Climate Conditions ◽  
Maize Hybrids ◽  
Seed Technology ◽  
Green Mass ◽  
Maize Seeds ◽  
Ground Mass

The research aimed to identify the most productive hybrids selected by the All-Russian Research Institute of Maize to cultivate by the cereal seed technology in the natural conditions of the Middle Cis- Urals. Methodology. Maize was cultivated for seeds and green fodder for farm animals in the conditions of the Middle Cis-Urals. The maize green mass, consisting mainly of stems and leaves, usually contains up to 88-90% water. Silage being prepared for it has less dry matter and protein. Such fodder has low nutritional value and poor return from livestock products. The most high quality and nutritious feed can be received from maize seeds or its above-ground mass with seeds of milky-wax and wax ripeness. To select early-maturing hybrids with high nutritional value is the primary concern for the studied area. Results. The results demonstrate that the productivity of maize hybrids ranges from 2.50 to 6.76 t/ha depending on soil and climatic conditions. When maize hybrids are grown by seed technology, the above-ground mass of the studied crops is 30.68-68.80 t/ha. Conclusions. It is necessary to select earlier ripening and highly productive hybrids to increase the quality and nutrition of corn feed. The recommended hybrids for grain production are Ural 150 (5,45 t/ha), Baikal (5,38 t/ha) and Mashuk 170 MV (4,98 t/ha); K-170 (56,7 t/ha), Shihan (55,67 t/ha) and Mashuk 170 MV (54,99 t/ha) that provided a higher output of the green mass at milky-wax ripeness of grain are best for silage production. The resulting data make it possible to select maize hybrids with high yields and nutritional value for farms with similar soil and climate conditions and to develop diets for highly productive dairy and beef cattle.

scholarly journals Experimental Study of the Effect of Curing Mode on Concreting in Hot Weather

2021 ◽  
Vol 31 (4) ◽  
pp. 243-248
Author(s):  
Nassima Bakir
Keyword(s):  
Experimental Study ◽  
Concrete Surface ◽  
Work Conditions ◽  
Climatic Conditions ◽  
Water Evaporation ◽  
Negative Effects ◽  
Climate Conditions ◽  
Hot Climate ◽  
Hot Weather ◽  
Job Site

Most developing countries have hot climate, ordinary jobsites characterized by reduced of human resources, equipment and infrastructures. The objective of this article is to make an experimental study of the influence of the hot climate such as that of Algeria, on the different properties of concrete in the fresh state, such as excessive water evaporation from the concrete surface, increased demand for water, increased slump loss corresponding to additional water on job-site, higher plastic shrinkage cracking and difficulty in controlling air content. At the hardened state, we could mention a reduction of strength at 28 days, decreased durability resulting from cracking at long-term period. To show the problems linked to concreting under these conditions and to present the appropriate solutions concrete or mortar can withstand the conditions in which it is implemented. Thus, negative effects caused principally by hot weather concreting motivated the choice of the such study. The research experimental work conditions in which the cementitious matrix was kept concerned two different environments, namely hot and dry climate conditions (t = 40°, h = 0%) alike the climate of the region of M'sila., and that of a medium with a hot and humid environment (t = 40°, h = 100%). The output of the investigation demonstrated the crucial role of the cure method in hot regions. The comparison of results for a reference concrete kept in air without any curing measures with two curing types simulating hot weather environment of the region M’sila was undertaken. These obtained outcome results were discussed based on the influence of climatic conditions to conclude procedures for hot weather concreting and suitable cure methods.

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