Alfalfa and Red Clover as Sources of Nectar and Pollen for Honey, Bumble, and Leaf-cutter Bees (Hymenoptera: Apoidea)

1957 ◽  
Vol 89 (5) ◽  
pp. 230-235 ◽  
Author(s):  
G. A. Hobbs
Keyword(s):  
Red Clover ◽  
River Valley ◽  
Southern Alberta ◽  
Relative Attractiveness ◽  
Alfalfa Seed

The most important factor affecting the densities of pollinating species of bees on alfalfa seed fields in southern Alberta is competing flowering growth (Hobbs and Lilly, 1954, 1955). This is a report on the relative attractiveness of red clover and alfalfa to honey, bumble, and leaf-cutter bees in southern Alberta. Observations were made on the first crops grown in each of two newly cultivated and irrigated areas near Hays; the fields were isolated from all other entomophilous crops by at least five miles of virgin prairie. A third series of observations was made on crops grown in the isolated river valley near Lethbridge previously described by Hobbs and Lilly (1955).

Ecology of the Leaf-cutter Bee Megachile perihirta Ckll. (Hymenoptera: Megachilidae) in Relation to Production of Alfalfa Seed

1956 ◽  
Vol 88 (11) ◽  
pp. 625-631 ◽  
Author(s):  
G. A. Hobbs
Keyword(s):  
Flight Period ◽  
Relative Importance ◽  
Southern Alberta ◽  
Alfalfa Seed ◽  
Nesting Habits ◽  
Mixed Prairie ◽  
Ground Nesting ◽  
Distribution Frequency

The relative importance as pollinators of alfalfa of each of the 14 species of Megachile that occur in southern Alberta has been assessed on the basis of Alberta distribution, frequency and abundance in mixed prairie, nesting habits, pollen preferences, and flight period; two ground-nesting species of the subgenus Xanthosarus Rob., Megachile perihirta Ckll. and M. dentitarsus Slad., were judged the principal pollinators (Hobbs and Lilly, 1954).

Alfalfa (Medicago sativa) Seed Yield Loss Due to Canada Thistle (Cirsium arvense)

1991 ◽  
Vol 5 (4) ◽  
pp. 723-728 ◽  
Author(s):  
James R. Moyer ◽  
G. Bruce Schaalje ◽  
Peter Bergen
Keyword(s):  
Medicago Sativa ◽  
Linear Equation ◽  
Seed Yield ◽  
Yield Loss ◽  
Linear Equations ◽  
Cirsium Arvense ◽  
Average Yield ◽  
Canada Thistle ◽  
Southern Alberta ◽  
Alfalfa Seed

Alfalfa seed yield and Canada thistle densities were measured in 10 fields in southern Alberta to assess the effect of thistles on seed yield. Thistle density and seed yield from each field were fitted to the Weibull, hyperbolic, and linear equations and a random coefficient and linear equation were used to obtain an “average yield loss curve”. Estimated average losses in alfalfa seed yield were >34% and >48% at thistle densities of 10 and 20 shoots m–2, respectively.

Biology of the Superb Plant Bug, Adelphocoris superbus (Uhl.) (Hemiptera: Miridae), in Southern Alberta

1956 ◽  
Vol 88 (3) ◽  
pp. 118-125 ◽  
Author(s):  
C. E. Lilly ◽  
G. A. Hobbs
Keyword(s):  
Economic Importance ◽  
Immature Seed ◽  
Southern Alberta ◽  
Alfalfa Seed

The superb plant bug, Adelphocoris superbus (Uhl.), is a serious pest in some alfalfa seed fields in southern Alberta. It feeds on the unopened bud clusters, causing them to whiten and die (bud-blasting). Under cages, it has also caused flower-drop, stunting of plants, and destruction of immature seed (Sorenson, 1954). When numerous it may prevent fields from producing enough bloom for the alfalfa pollinators in the vicinity, and in such numbers is of economic importance to the seed-growers. The number of bugs necessary for an economic population thus varies inversely with the pollinator population on the field.

STUDIES ON THE DISTRIBUTION OF MOLYBDENUM IN BIOLOGICAL MATERIAL: I. A SPECTROGRAPHIC STUDY OF THE OCCURRENCE OF MOLYBDENUM IN PLANTS GROWN IN THE PROVINCE OF QUEBEC

1934 ◽  
Vol 11 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Andrew Dingwall ◽  
R. R. McKibbin ◽  
H. T. Beans
Keyword(s):  
Drainage Basin ◽  
Red Clover ◽  
River Valley ◽  
Reed Canary Grass ◽  
Canada Thistle ◽  
Ottawa River ◽  
Field Corn ◽  
Canary Grass ◽  
St Lawrence River ◽  
Celery Cabbage

Molybdenum, identified spectrographically by the lines 3902.9Å, 3864.1Å, 3798.3Å, 3193.9Å, 3170.3Å, 3158.1Å and 3132.6Å, was found to be present in vetch, alfalfa, alsike, red clover, timothy, goldenrod, reed canary grass, field corn stalks, Canada thistle, ragweed, celery, beets and carrots grown on a farm in Jacques Cartier county, Quebec. Molybdenum could not be detected in the soil on which the plants grew.Molybdenum was not found in vetch plants grown on several farms in Brome, Compton and Sherbrooke counties; nor in timothy, alsike clover or red clover grown on a farm in Brome county; nor in lettuce, celery, cabbage, beets and carrots grown on two different muck soils of the St. Lawrence River valley, in Huntingdon county.The farm in Jacques Carder county lies in the Ottawa River valley drainage basin, the other farms do not. Known deposits of molybdenum occur in the Ottawa River valley.

A new crocodylian (Archosauria) from the basal Paleocene of the Red Deer River Valley, southern Alberta

2001 ◽  
Vol 38 (12) ◽  
pp. 1689-1704 ◽  
Author(s):  
Xiao-Chun Wu ◽  
Donald B Brinkman ◽  
Richard C Fox
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Red Deer ◽  
River Valley ◽  
Additional Information ◽  
Southern Alberta ◽  
Incisive Foramen

Borealosuchus griffithi, sp. nov., is described on the basis of an incomplete skeleton from the basal Paleocene, southern Alberta. This new species records one of a few basal Cenozoic occurrences of Crocodylia so far known. B. griffithi is most distinctive in having a markedly laterally concavo-convex snout; a deep, elongate recess or fossa on the anteroventral surface of the jugal; and a large, nearly rectangular incisive foramen. Within Borealosuchus, B. griffithi probably takes a "more crownward" position than does B. sternbergii of the late Late Cretaceous. With additional information from the new species, the diagnosis of Borealosuchus is revised.

Quackgrass (Elytrigia repens) Interference and Control in Seed Alfalfa (Medicago sativa)

1993 ◽  
Vol 7 (1) ◽  
pp. 58-64 ◽  
Author(s):  
James R. Moyer ◽  
G. Bruce Schaalje
Keyword(s):  
Seed Yield ◽  
Hyperbolic Model ◽  
Threshold Density ◽  
Economic Threshold ◽  
Elytrigia Repens ◽  
Southern Alberta ◽  
Herbicide Treatments ◽  
Alfalfa Seed ◽  
Seed Yields ◽  
And Control

Alfalfa seed yield and quackgrass density were measured in seven irrigated fields in southern Alberta to assess the effect of quackgrass on seed yield. Six herbicides were tested to determine their effect on quackgrass growth and accompanying alfalfa seed yield. The effect of quackgrass on seed yield was adequately described by a hyperbolic model. Quackgrass densities of 50 and 100 heads per m2reduced seed yields by 56 and 74%, respectively. The economic threshold density was 3 quackgrass heads per m2. The most effective herbicide treatments, quizalofop and propaquizafop, resulted in good initial quackgrass suppression and yield increases similar to those predicted by the hyperbolic model.

Burning of alfalfa stubble for insect control as it affects soil chemical properties

1992 ◽  
Vol 72 (2) ◽  
pp. 169-175 ◽  
Author(s):  
J. F. Dormaar ◽  
B. D. Schaber
Keyword(s):  
Pest Management ◽  
Prescribed Burning ◽  
Chemical Properties ◽  
Management Programme ◽  
Soil Chemical Properties ◽  
Total N ◽  
Southern Alberta ◽  
Pest Insects ◽  
Alfalfa Seed ◽  
Subsequent Crop

Southern Alberta growers often burn fields of seed alfalfa (Medicago sp.) prior to initiation of growth in the spring as a part of an Integrated Pest Management Programme. An 8-yr study compared the effects of (a) fall-burned every year, (b) spring-burned, prior to growth, every year, (c) spring-burned, prior to growth, every other year, and (d) zero burned, on various chemical properties of the upper 50 mm of soil. Burning led to highly significant increases in carbohydrates, total N, NO3-N, and extractable K over the 8 yr. Increases were also highly significant for NH4-N under the fall-burned every year regime. Spring-burning, prior to growth, every other year, led to the least accumulations of measured parameters. Although pest insects were controlled and pedigreed alfalfa seed production was increased under the various burn treatments examined within the conditions of the experiment, changes in certain soil chemical properties identified the need to monitor subsequent crop behavior once the alfalfa fields have been ploughed. Key words: Fire, prescribed burning, pest management, seed alfalfa

QUANTIFICATION OF MANDIBULAR WEAR OF FEMALE ALFALFA LEAFCUTTER BEES, MEGACHILE ROTUNDATA (F.) (HYMENOPTERA: MEGACHILIDAE), BY IMAGE ANALYSIS

1993 ◽  
Vol 125 (1) ◽  
pp. 93-99 ◽  
Author(s):  
E.G. Kokko ◽  
B.D. Schaber ◽  
T. Entz
Keyword(s):  
Image Analysis ◽  
Digital Image Analysis ◽  
Megachile Rotundata ◽  
Wear Analysis ◽  
Southern Alberta ◽  
Before And After ◽  
Alfalfa Seed ◽  
Leafcutter Bee ◽  
Mandibular Teeth ◽  
Seed Yields

AbstractIn southern Alberta, alfalfa seed yields are related to the amount of pollination that occurs before mid-August by the major pollinator, the alfalfa leafcutter bee, Megachile rotundata (F.). Cutting the leaves causes wear to the bee’s mandibular teeth and could reduce the bee’s pollination efficiency and, ultimately, seed production. A method is described for employing digital image analysis to measure mandibular tooth areas for alfalfa leafcutter bees. The method is relatively quick and has high precision and repeatability. This method was used to measure the area of the mandibular teeth for leafcutter bees, before and after foraging in alfalfa seed fields, to evaluate differences in mandibular wear. Analysis of mandibles showed that foraging leafcutter bees collected in late July had significantly smaller tooth areas than pre-foraging bees collected prior to release in June.

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