The ecology of Paecilomyces farinosus in two balsam fir forests infested with spruce budworm

1991 ◽  
Vol 69 (3) ◽  
pp. 512-515 ◽  
Author(s):  
Sharon Harney ◽  
Paul Widden
Keyword(s):  
Key Words ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
Paecilomyces Farinosus ◽  
Apparent Correlation

The occurrence of Paecilomyces farinosus and other microfungi on litter was monitored in two balsam fir forests infested with spruce budworm to determine the possible role of this fungus as a saprophyte in these forests. The microfungi on the fir litter were similar to those found on other conifers. Paecilomyces farinosus, however, was very abundant, and its abundance increased on the litter after it fell to the ground. An apparent correlation between the abundance of the fungus and the population of spruce budworm suggests that opportunistic parasitism may positively affect the abundance of P. farinosus. Key words: Paecilomyces farinosus, entomopathogens, balsam fir, litter, microfungi.

Variations in the foliar amino acid composition of flowering and non-flowering balsam fir (Abies balsamea (L.) Mill.) and white spruce (Picea glauca (Moench) Voss) in relation to outbreaks of the spruce budworm (Choristoneura fumiferana (Clem))

1971 ◽  
Vol 49 (7) ◽  
pp. 1005-1011 ◽  
Author(s):  
J. P. Kimmins
Keyword(s):  
Amino Acids ◽  
Picea Glauca ◽  
Host Plants ◽  
Choristoneura Fumiferana ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
White Spruce ◽  
Balsam Fir ◽  
Apparent Correlation

The amino acids of new and old foliage of flowering and non-flowering balsam fir (Abies balsamea (L.) Mill.) and white spruce (Picea glauca (Moench) Voss) were investigated using two-dimensional descending paper chromatography. The data were analyzed for variation associated with age of foliage, age of tree, and flowering condition. The concentration of foliar amino acids was greater in balsam fir than in white spruce, and greater in new foliage than old foliage.The difference in concentration between foliage of flowering and non-flowering trees was smaller. However, the new foliage of flowering fir had higher levels of most of the amino acids examined than any other foliage category. This appears to reflect the known suitability of these foliage categories for spruce budworm larvae. While the data presented do not quantify the ecological significance of this apparent correlation, they do support the theory that variations in the nutritional quality of host plants play a very important role in the dynamics of herbivore populations.

Degradation and Loss of Wood Fibre in Spruce Budworm-Killed Timber, and Effects on Utilization

1984 ◽  
Vol 60 (1) ◽  
pp. 10-14 ◽  
Author(s):  
J. T. Basham
Keyword(s):  
North America ◽  
Key Words ◽  
Current Knowledge ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Wood Fibre ◽  
Balsam Fir ◽  
Dead Trees ◽  
Forest Manager

Far more investigations of the deterioration and utilization of the stems of trees killed following spruce budworm (Choristoneura fumiferana [Clem.]) defoliation have been, or are being, carried out during the current budworm outbreak in eastern and central North America than in all previous outbreaks combined. Unfortunately the results are dispersed in a wide variety of publications, some of which are relatively obscure and difficult to find. This report is an attempt to assist the forest manager faced with salvage decisions, by reviewing and summarizing current knowledge and by identifying some of the potentially useful literature. Key words: Spruce budworm, balsam fir, stem deterioration, sap rot, dead trees, salvage, utilization, pulp quality.

Physiological properties of the entomopathogenic hyphomycete Paecilomyces farinosus in relation to its role in the forest ecosystem

1991 ◽  
Vol 69 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Sharon Harney ◽  
Paul Widden
Keyword(s):  
Biological Control ◽  
Carbon Sources ◽  
Spruce Budworm ◽  
Tree Canopy ◽  
Balsam Fir ◽  
Paecilomyces Farinosus ◽  
Physiological Properties ◽  
Wide Range ◽  
Entomopathogenic Hyphomycete ◽  
Saprophytic Ability

Fifty-four strains of the entomopathogenic fungus Paecilomyces farinosus, half of which had been isolated from balsam fir litter and half of which had been isolated from naturally infected spruce budworm larvae, were evaluated for their use of a number of complex carbohydrates and other carbon sources, to determine their potential saprophytic ability. The fungi were also tested for (i) their ability to grow on and to decompose balsam fir litter, and (ii) their ability to survive desiccation, which is likely to occur in the tree canopy. The fungi produced a wide range of enzymes, including cellulases, chitinases, and proteases. They also grew on and decomposed balsam fir litter. A discriminant analysis showed a tendency for the strains isolated from spruce budworm to grow better on gelatin, whereas those from the litter grew better on cellulose. We conclude that P. farinosus is a versatile saprophyte, capable of opportunistically parasitizing spruce budworm larvae. These characteristics could be important when considering P. farinosus as a possible agent of biological control. Key words: Paecilomyces farinosus, entomopathogen, spruce budworm, saprophytic ability, hydrolases.

scholarly journals Epidemiology of the Spruce Budworm in Western Ontario: A Discussion

1985 ◽  
Vol 61 (6) ◽  
pp. 494-498 ◽  
Author(s):  
J. R. Blais
Keyword(s):  
Boreal Forest ◽  
Key Words ◽  
Choristoneura Fumiferana ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
The Other ◽  
Balsam Fir ◽  
The Past ◽  
Future Behavior ◽  
High Concentrations

Spruce budworm outbreaks for the past two centuries in western Ontario occurred in two main sectors, the Lake Nipigon and the Lac Seul sectors. Some were common to both sectors, while others were specific to one or the other. Intervals between infestations within sectors averaged about 60 years. For western Ontario, budworm populations oscillated at irregular intervals ranging from 15 to 60 years. Infestations generally originated in the boreal forest in centers with high concentrations of fir, and then appeared in areas with lower volumes of fir. Fir content and the susceptibility to budworm attack of forests in western Ontario are compared with conditions prevailing in Quebec and the Maritimes. There are new outbreaks in western Ontario, and their future behavior could clarify some aspects of budworm epidemiology. Key words: Spruce budworm, Choristoneura fumiferana; Balsam fir, Abies balsamea (L.) Mill.; Epidemiology.

Impact de la tordeuse des bourgeons de l'épinette [Choristoneura fumiferana (Clem.)] sur la régénération des sapinières après la coupe à blanc

1993 ◽  
Vol 69 (2) ◽  
pp. 163-172 ◽  
Author(s):  
J.-C. Ruel ◽  
M. Huot
Keyword(s):  
Key Words ◽  
Choristoneura Fumiferana ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
Dominant Position ◽  
The Impact ◽  
Coupe À Blanc

An analysis of over 100 balsam fir [Abies balsamea (L.) Mill.] stands has shown some effects of spruce budworm defoliation on regeneration after clearcutting. Even though softwood stocking was consistently high prior to harvesting operations, longer infestation periods or more severe defoliation levels led to a decrease in the stocking of softwood stems above 50 cm height and to the establishment and development of hardwood advance growth. Hardwoods were more often in a dominant position in the most severely damaged stands and the budworm effect was still persistent on the regeneration structure even 5 years after logging. Cutovers with less than 60% stocking were also more frequent in the most severely devastated fir stands. This situation seemed directly related to the impact of the spruce budworm on balsam fir advance growth. Key words: balsam fir, Choristoneura fumiferana, advance growth, clearcutting

THE ROLE OF COMMUNICATIVE AND FUNCTIONAL APPROACH IN THE TRANSLATION OF SCIENTIFIC AND TECHNICAL LITERATURE (Ukrainian — German discourse)

2019 ◽  
Vol 26 (27) ◽  
pp. 68-74
Author(s):  
Svitlana Gruschko
Keyword(s):  
Key Words ◽  
Information Exchange ◽  
Functional Approach ◽  
Communication Structure ◽  
Technical Literature ◽  
Translation Strategy ◽  
Purposeful Activity

The article investigates the role of communicative-functional approach in the translation of scientific and technical literature, when the translation itself is seen as a tool to accomplish purposeful activity of communicators, representatives of different interlingual groups. In practical terms, the difficulties of translating scientific and technical texts are due to the peculiarities of scientific style, insufficient understanding of the terminology of a particular field of knowledge, which complicates the choice of adequate translation solutions. In this context, an important role is played by the translation strategy, where the communicativefunctional approach dominates. The translation is implicitly included in the communication structure between the author and the recipient. The relevance of the article is determined by the necessity of studying the problems of scientific and technical literature translation, taking into account the current realities of interlanguage information exchange. Key words: communicative-functional approach, interlingual communication, translation, structure

INTERPRETATIONAL FIELD OF THE CONCEPT “WOMAN” IN ENGLISH AND KYRGYZ LINGUOCULTURES

2019 ◽  
pp. 54-56
Author(s):  
Баяманова М.С.
Keyword(s):  
Comparative Study ◽  
Key Words ◽  
Analytical Data ◽  
Semantic Field ◽  
Traditional Values ◽  
Lexical Unit ◽  
Semantic Fields ◽  
Field Culture

Summary: The article deals with the analysis of the interpretational field of the basic lexical units which represent the meaning of the concept “woman” in English and Kyrgyz languages and cultures. Comparative – contrastive analytical data of the most frequently used in both languages variants of the interpretation of the concept “woman” have been given. The semantic fields of nuclear and nearnuclear meanings of the lexical units, transforming the notion of “woman” in English and Kyrgyz languages and also the place and role of these notions in cultures and philosophy of the nations on the basis of mentality and traditional values have been studied and described. The situations of the use of this or that variant of the meaning of lexical unit. A comparative study of the definitions of the word “woman’ in English and Kyrgyz languages have been given. Key words: concept, woman, interpretational field, notion, definition, semantic field, culture, language, linguoculture, transformation Аннотация: В статье рассматриваются интерпретационные поля основных лексических единиц, репрезентирующих значение концепта «женщина» в английской и кыргызской лингвокультурах. Приводятся сравнительно-сопоставительные аналитические данные наиболее употребительных в речи обоих языков вариантов интерпретации концепта «женщина». Изучены и описаны семантические поля ядерных и околоядерных значений лексических единиц, трансформирующих понятие «женщина» в английском и кыргызском языке, а также роль и место этих понятий в культурах и философии народов на основе менталитета и традиционных ценностей. Приводятся ситуации использования того или ино- го варианта значения лексической единицы, проведено сравнительное изучение определений слова «женщина» в английском и кыргызском языках. Ключевые слова: концепт, женщина, интерпретационное поле, понятие, определение, семантическое поле, культура, язык, лингвокультура, трансформация Аннотация: Макалада англис жана кыргыз тилдеринде жана маданияттарында «аял» концептинин маанисин репрезентациалаган негизги лексикалык бирдиктер каралат. «Аял» концептин эки тилдеги кѳп колдонулуучу интерпретациялоо варианттарынын аналитикалык салыштырма маалыматтары изил- делип берилген. Англис жана кыргыз тилдеринде «аял» түшүнүгүн трансформациялаган лексикалык бирдиктердин түп нуска жана ага жакындашкан маанилери иликтелип каралган. Берилген түшүнүктѳрдүн элдик философиясында жана маданиятында, менталитеттин жана салттын негизинде эл арасына кеӊири тараган, элдик тилде жана маданиятта ойногон ролу менен орду чагылдырылган. Ар түрдү ситацияларда колдонулуучу тиги же бул лексикалык бирдиктердин маанисинин варианттары каралган, «аял» деген сѳздун англис жана кыргыз тилдериндеги түшүндүрмѳлѳрү салыштырылып изилделген. Түйүндүү сѳздѳр: концепт, аял, интерпретациялоо мейкиндиги, түшүнүк, түшүндүрмѳ, семантикалык чѳйрѳ, маданият, тил, лингвомаданият, трансформациялоо

scholarly journals Predicting balsam fir mortality in boreal stands affected by spruce budworm

2021 ◽  
Vol 496 ◽  
pp. 119408
Author(s):  
Djidjoho Julien Houndode ◽  
Cornelia Krause ◽  
Hubert Morin
Keyword(s):  
Spruce Budworm ◽  
Balsam Fir

Weather and Outbreaks of the Spruce Budworm in the Province of Quebec from 1939 to 1956

1961 ◽  
Vol 93 (2) ◽  
pp. 118-123 ◽  
Author(s):  
J. G. Pilon ◽  
J. R. Blais
Keyword(s):  
Choristoneura Fumiferana ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
The Past ◽  
Forest Regions ◽  
Tree Component ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

Nearly all forest regions in the Province of Quebec where balsam fir (Abies balsamea (L.) Mill.) is an important tree component have been subjected to severe defoliation by the spruce budworm, Choristoneura fumiferana (Clem.), during the past 20 years. These outbreaks have followed an easterly direction beginning near the Ontario-Quebec border in 1939 and ending in the Gaspé Peninsula in 1958.

The influence of hardwood content on balsam fir defoliation by spruce budworm

1996 ◽  
Vol 26 (9) ◽  
pp. 1620-1628 ◽  
Author(s):  
Qiong Su ◽  
Ted D. Needham ◽  
David A. MacLean
Keyword(s):  
New Brunswick ◽  
Natural Enemies ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
Generalized Model ◽  
Stand Management ◽  
Working Hypothesis ◽  
Model Combining

Changing stand composition by increasing hardwood content has been suggested as a long-term method for reducing susceptibility and vulnerability of balsam fir (Abiesbalsamea (L.) Mill.) to spruce budworm (Choristoneurafumiferana (Clem.)). Twenty-five mixed balsam fir–hardwood stands were selected in northern New Brunswick, with five stands in each 20% hardwood class (0–20, 21–40%, etc.). Defoliation each year from 1989 to 1993 was significantly (p < 0.0001) related to hardwood content, with r2 ranging from 0.57 to 0.81. As hardwood content increased, defoliation of balsam fir decreased. From 1989 to 1992, the years of moderate to severe defoliation, balsam fir stands with <40% hardwoods sustained 58–71% defoliation, on average, versus 12–15% defoliation in stands with >80% hardwood. A generalized model combining hardwood content and the estimated defoliation in pure softwood stands in a given year explained 77% of the variation in defoliation over stands and years. This study indicated that mixed balsam fir–hardwood stand management, with hardwood content >40%, could substantially reduce losses during spruce budworm outbreaks. Further research is warranted to elucidate the mechanism involved, but our working hypothesis is that greater hardwood content increased the diversity or populations of natural enemies such as birds and parasitoids.

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