THE BIOLOGY OF CANADIAN WEEDS.: 87. Cynoglossum officinale L.

1988 ◽  
Vol 68 (3) ◽  
pp. 763-774 ◽  
Author(s):  
MAHESH K. UPADHYAYA ◽  
HEIDY R. TILSNER ◽  
MICHAEL D. PITT
Keyword(s):  
North America ◽  
Environmental Stress ◽  
Seed Production ◽  
Seed Dormancy ◽  
Cynoglossum Officinale ◽  
Weed Biology ◽  
Perennial Weed ◽  
Animal Hair ◽  
And Control

Cynoglossum officinale L. is a biennial or short-lived perennial weed which reproduces by seed. It has been introduced to North America from Eurasia. Although usually not a weed of cultivated fields, C. officinale may become a serious rangeland weed. High seed production, seed dormancy, dissemination by attaching seeds to animal hair, wool and fur, plus the ability to withstand environmental stress are important in the success of C. officinale as a weed. Because C. officinale foliage is toxic to both cattle and horses, it is a particular problem in areas where grazing occurs. This paper reviews the biology and control of C. officinale.Key words: Weed biology, Cynoglossum officinale L., hound’s tongue

THE BIOLOGY OF CANADIAN WEEDS.: 75. Bromus tectorum L.

1986 ◽  
Vol 66 (3) ◽  
pp. 689-709 ◽  
Author(s):  
MAHESH K. UPADHYAYA ◽  
DOUGLAS McILVRIDE ◽  
ROY TURKINGTON
Keyword(s):  
British Columbia ◽  
North America ◽  
Bromus Tectorum ◽  
Downy Brome ◽  
Weed Biology ◽  
Intensive Research ◽  
Extensive Documentation ◽  
Competitive Success ◽  
Canadian Provinces ◽  
And Control

Bromus tectorum L. (downy brome), introduced to North America from Europe before 1861, has spread throughout most of the continent. It is present in all Canadian provinces except Newfoundland and is particularly abundant in southwestern Alberta and southern British Columbia. The ubiquitous nature of B. tectorum and its dual role as a serious weed and an important forage have resulted in extensive documentation on various aspects of its biology. Intensive research efforts have been expended in understanding its competitive success, and in implementing management and control practices. This paper reviews and summarizes literature on the biology of B. tectorum.Key words: Bromus tectorum, downy brome, cheatgrass, weed biology

THE BIOLOGY OF CANADIAN WEEDS. 94. Sonchus arvensis L.

1990 ◽  
Vol 70 (2) ◽  
pp. 509-532 ◽  
Author(s):  
WANDA K. LEMNA ◽  
CALVIN G. MESSERSMITH
Keyword(s):  
North America ◽  
Population Biology ◽  
Control Methods ◽  
Weed Biology ◽  
Glandular Hairs ◽  
Canadian Provinces ◽  
Sonchus Arvensis ◽  
And Control

Perennial sow-thistle (Sonchus arvensis L.) was introduced into North America from Europe and Asia and is distributed widely throughout the Canadian provinces. Two varieties are common; var. arvensis and var. glabrescens differ morphologically in the presence or absence of glandular hairs on peduncles and involucral bracts, respectively. Both varieties are common along roadsides and river and lake shores and in waste areas and cultivated fields throughout their introduced and native ranges. The perennial nature and ability to spread both by spreading roots and by seed make these weeds difficult to control. Details on the morphology, cytology, distribution, reproductive and population biology, and control methods are reviewed.Key words: Distribution, perennial sow-thistle, smooth perennial sow-thistle, weed biology

The biology of Canadian weeds.: 97. Barbarea vulgaris R.Br.

1991 ◽  
Vol 71 (1) ◽  
pp. 149-166 ◽  
Author(s):  
Marilyn A. MacDonald ◽  
Paul B. Cavers
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Seed Production ◽  
Seed Dormancy ◽  
Rapid Growth ◽  
Barbarea Vulgaris ◽  
Weed Biology ◽  
Southern Ontario ◽  
Grain Crops ◽  
Disturbed Areas

Barbarea vulgaris R.Br. is an introduced weed of recently disturbed areas, small-seeded grain crops, roadsides and pastures. It is abundant in southern Ontario, Quebec and the northeastern U.S.A.; frequent in the Maritimes, British Columbia and the northwest coastal U.S.A.; and rare south of 33°N, north of 50°N and across the prairies. The weediness of this species largely results from its prolific seed production, enforced and induced seed dormancy, and its rapid growth under favourable conditions. Key words: Barbarea vulgaris, yellow rocket, weed biology

Valsa sordida. [Descriptions of Fungi and Bacteria].

1998 ◽  
Author(s):  
V. P. Hayova
Keyword(s):  
Czech Republic ◽  
New Zealand ◽  
North America ◽  
South America ◽  
Environmental Stress ◽  
Geographical Distribution ◽  
Plant Diseases ◽  
Republic Of Georgia ◽  
Distribution Maps ◽  
Poplar Trees

Abstract A description is provided for Valsa sordida. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Valsa sordida is usually associated with Valsa canker of poplar twigs. Wounded trees, and trees injured by insects or attacked by other pathogens are more susceptible to infection. Development of Valsa canker is affected by environmental stress (Guyon, 1996; Tao et al., 1984). Poplar canker caused by V. sordida has been studied in different countries (CMI Distribution Maps of Plant Diseases, 1977; Worrall, 1983; Wang et al., 1981) The fungus can be often found in declining poplar stands together with another pathogen of poplar trees, Leucostoma niveum. Valsa sordida may also cause necrosis of willow twigs. HOSTS: Populus spp., Salix spp. and, more rarely, other woody angiosperms. GEOGRAPHICAL DISTRIBUTION: Africa: Morocco. Asia: Armenia, Azerbaijan, China, Republic of Georgia, India, Iran, Iraq, Israel, Japan. Kazakhstan, Korea, Russia (Tatarstan), Turkey, Turkmenia, Uzbekistan. Australasia: Australia (Victoria), New Zealand. Europe: Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, France, Germany, Greece, Ireland, Italy, Netherlands, Norway, Poland, Portugal, Rumania, Russia, Slovakia, Sweden, Switzerland, UK, Ukraine, former Yugoslavia. North America: Canada (Alberta, British Columbia, Nova Scotia, Ontario, Québec, Saskatchewan). USA (California, Colorado, Michigan, Minnesota). South America: Chile. TRANSMISSION: Both conidia and ascospores are air-borne, especially under humid conditions. Yellow or orange exudation of conidia from conidiomata can be often seen after rain.

scholarly journals First interception of the greenhouse pest Echinothrips americanus Morgan, 1913 (Thysanoptera: Thripidae) in Slovakia

2009 ◽  
Vol 44 (No. 4) ◽  
pp. 155-159 ◽  
Author(s):  
L. Varga ◽  
P.J. Fedor
Keyword(s):  
North America ◽  
Host Range ◽  
Botanical Garden ◽  
European Countries ◽  
Pest Species ◽  
Wide Host Range ◽  
Short Time ◽  
And Control

<i>Echinothrips americanus</i> Morgan, 1913, is one of the pest species that expanded their area of distribution in a relatively short time. Being native to the eastern parts of North America, its first European interception was recorded in 1989. Since then it has invaded greenhouses in most European countries, including Slovakia, where it was first recorded in inspected material at the Botanical garden in Košice. As a polyphagous thrips with a wide host range it may induce damage mainly on ornamentals, although if low in numbers it can be easily overlooked. The species is a suitable example where preventive steps against its spread have not been sufficient enough which, therefore, demands further monitoring. Remarks on morphology, identification, economical importance and control are also given.

Biology and management of Echinochloa colona and E. crus-galli in the northern grain regions of Australia

2019 ◽  
Vol 70 (11) ◽  
pp. 917 ◽  
Author(s):  
Asad Shabbir ◽  
Bhagirath S. Chauhan ◽  
Michael J. Walsh
Keyword(s):  
Seed Production ◽  
Seed Dormancy ◽  
Rapid Growth ◽  
Cropping Systems ◽  
Control Strategies ◽  
Yield Losses ◽  
Annual Grass ◽  
Fallow Management ◽  
Current Information ◽  
Wide Range

Echinochloa colona and E. crus-galli are two important annual grass weeds distributed throughout the summer cropping regions of Australia. Both species are highly problematic weeds, responsible for yield losses of up to 50% in summer grain crops. The success of Echinochloa species as weeds is attributed to their rapid growth, prolific seed production, seed dormancy and adaptability to a wide range of environments. Importantly, E. colona has evolved resistance to glyphosate in Australia, with resistant populations now widespread across the summer cropping regions. Fallow management of E. colona with glyphosate alone is risky in terms of increasing the chance of resistance and highly unsustainable; other control strategies (residual herbicides, strategic tillage, etc.) should be considered to complement herbicides. This review provides a summary of current information on the biology, ecology and management of Echinochloa species. The knowledge gaps and research opportunities identified will have pragmatic implications for the management of these species in Australian grain cropping systems.

Sign in / Sign up

Export Citation Format

Share Document