Ecology of insect-induced hot spots in stored grain in western Canada

1966 ◽  
Vol 8 (2) ◽  
pp. 107-132 ◽  
Author(s):  
R. N. Sinha ◽  
H. A. H. Wallace
Keyword(s):  
Hot Spots ◽  
Western Canada ◽  
Stored Grain

FUNGI ASSOCIATED WITH HOT SPOTS IN FARM STORED GRAIN

1962 ◽  
Vol 42 (1) ◽  
pp. 130-141 ◽  
Author(s):  
H. A. H. Wallace ◽  
R. N. Sinha
Keyword(s):  
Hot Spots ◽  
Viable Seed ◽  
Stored Grain ◽  
Surface Layers ◽  
Bulk Heating ◽  
Storage Fungi ◽  
Grain Bulks ◽  
Penicillium Spp ◽  
Water Contents

The temperature, moisture, germination and fungal relationships of normal and heated wheat and oats collected from grain bulks in 13 granaries in Manitoba and Saskatchewan were determined during the falls and winters of 1957–60. Eight bulks were studied in detail. It was found that hot spots could develop anywhere in a bin. Temperatures up to 53 °C. (in winter) were obtained and were usually highest at the base of the bulk. Heating grain was relatively dry (less than 11 per cent) except along the surface. The highest water contents (27 per cent) in the bulks always occurred in the gram along the surface layers. Loss of germinability could occur anywhere in the bulk. Field fungi, such as Alternaria, were common in viable seed, but negligible in heated grain. The seeds in hot spots were predominantly infected by storage fungi, among which Penicillium spp. were the most abundant, even in relatively dry grain at the 6-foot depth. Other fungi commonly found were Aspergillus spp., especially A. flavus Link, A. fumigatus Fresenius, A. versicolor (Vuillemin) Tiraboschi and Absidia spp. Actinomycetes (Streptomyces) were common in some heating grain bulks.

Insects and Mites Associated with Hot Spots in Farm Stored Grain

1961 ◽  
Vol 93 (8) ◽  
pp. 609-621 ◽  
Author(s):  
R. N. Sinha
Keyword(s):  
Hot Spots ◽  
Heating Process ◽  
Optimum Conditions ◽  
Stored Grain ◽  
Rapid Deterioration ◽  
Winter Conditions ◽  
Storage Fungi ◽  
Growth And Reproduction

Hot spots may develop quickly in farm stored grain under Canadian winter conditions. Heavy infestations of mites, insects and fungi may accompany such hot spots (Stirrett and Arnott, 1933; Watters, 1955). Once the heating process is initiated, whatever its cause, it brings about a rapid deterioration of grain, tluough charring of kernels, and reduction of their germinability, and by providing optimum conditions for the growth and reproduction of storage fungi, insects and mites.

THE DISTRIBUTION OF RHYZOPERTHA DOMINICA (F.) IN WESTERN CANADA

1993 ◽  
Vol 125 (2) ◽  
pp. 317-328 ◽  
Author(s):  
P.G. Fields ◽  
J. Van Loon ◽  
M.G. Dolinski ◽  
J.L. Harris ◽  
W.E. Burkholder
Keyword(s):  
United States ◽  
The United States ◽  
Rhyzopertha Dominica ◽  
Aggregation Pheromones ◽  
Western Canada ◽  
The South ◽  
Stored Grain ◽  
Grain Elevators ◽  
The North ◽  
Major Pest

AbstractRhyzopertha dominica (F.) (lesser grain borer, Coleoptera: Bostrichidae) is a major pest of stored grain in the United States, Australia, and most other warm regions of the world. It has rarely been detected in Canadian grain, until recently. To determine the distribution of/R. dominica in western Canada, Lindgren multiple-funnel traps baited with R. dominica aggregation pheromones were placed near grain elevators, feed mills, and farms. Rhyzopertha dominica was found flying outside grain-handling facilities in all Prairie Provinces in 1990 and 1991, with thousands collected in Manitoba, hundreds in Alberta, and less than 100 in Saskatchewan. A few R. dominica were caught in Vancouver and Thunder Bay. None were caught in the traps placed beside two grain elevators in southern Ontario. In Alberta and Saskatchewan, the locations with R. dominica were mainly in the south. In Manitoba, the total number of R. dominica caught at each location was higher in the south than in the north. Rhyzopertha dominica were caught as early as 15 May and as late as 18 September, with the peak numbers for a given location occurring between July and September. No difference in the total number of R. dominica caught per year was found among farms, feed mills, or grain elevators in 1990 or 1991. Sampling of stored grain on three farms showed that two of the eight bins sampled had R. dominica. The possible origins of the R. dominica (importation of infested grain, wind-borne migration from the United States, or an established Canadian population) are discussed.

scholarly journals Survival over the winter of Rhyzopertha dominica F. (Coleoptera: Bostrichidae) in hot spots caused by improper grain storage technology: the first record in the Czech Republic

1999 ◽  
Vol 35 (No. 1) ◽  
pp. 23-25 ◽  
Author(s):  
V. Stejskal ◽  
J. Zuska ◽  
P. Werner ◽  
Z. Kučerová
Keyword(s):  
Czech Republic ◽  
Hot Spots ◽  
First Record ◽  
Rhyzopertha Dominica ◽  
Grain Storage ◽  
Stored Grain ◽  
The Czech Republic ◽  
Storage Technology ◽  
First Time

The survival of dense populations of Rhyzopertha dominica in stored grain hot spots in the Czech Republic during winter months was documented for the first time. Improper storage of grain causes subsurface hot zones, which seem to provide conditions for pest overwintering and become the source of subsequent cross infestations. 

A high-performance oil-free backing pump for electron microscopes

1978 ◽  
Vol 36 (1) ◽  
pp. 110-111
Author(s):  
G.K.W. Balkau ◽  
E. Bez ◽  
J.L. Farrant
Keyword(s):  
Molecular Weight ◽  
Electron Microscope ◽  
Hot Spots ◽  
High Performance ◽  
Carbonaceous Material ◽  
Contamination Rate ◽  
Low Molecular Weight ◽  
Principal Source ◽  
Rotary Pumps ◽  
Electron Microscopes

The earliest account of the contamination of electron microscope specimens by the deposition of carbonaceous material during electron irradiation was published in 1947 by Watson who was then working in Canada. It was soon established that this carbonaceous material is formed from organic vapours, and it is now recognized that the principal source is the oil-sealed rotary pumps which provide the backing vacuum. It has been shown that the organic vapours consist of low molecular weight fragments of oil molecules which have been degraded at hot spots produced by friction between the vanes and the surfaces on which they slide. As satisfactory oil-free pumps are unavailable, it is standard electron microscope practice to reduce the partial pressure of organic vapours in the microscope in the vicinity of the specimen by using liquid-nitrogen cooled anti-contamination devices. Traps of this type are sufficient to reduce the contamination rate to about 0.1 Å per min, which is tolerable for many investigations.

World Bank pinpoints disaster hot spots

Nature ◽  
2005 ◽  
Author(s):  
Deirdre Lockwood
Keyword(s):  
World Bank ◽  
Hot Spots
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