Spatial Heterogeneity, Pollinator Behaviour and Pollinator-Mediated Gene Flow: Bumblebee Movements in Variously Aggregated Rows of Oil-Seed Rape

Oikos ◽  
1997 ◽  
Vol 78 (3) ◽  
pp. 546 ◽  
Author(s):  
James E. Cresswell
Keyword(s):  
Gene Flow ◽  
Spatial Heterogeneity ◽  
Pollinator Behaviour ◽  
Oil Seed ◽  
Oil Seed Rape

A note on sampling technique for winter oil-seed rape (Brassica napus L.)

1982 ◽  
Vol 99 (1) ◽  
pp. 225-227 ◽  
Author(s):  
D. H. Scarisbrick ◽  
A. Clewer ◽  
R. W. Daniels
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Nitrogen Fertilizer ◽  
Yield Components ◽  
Sampling Technique ◽  
Brassica Napus L ◽  
Plant Weight ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Sampling Problems

The response of three spring cultivars of oilseed rape to five levels of nitrogen fertilizer (0 to 200 kg/ha) was studied during 1978–9 (Scarisbrick, Daniels & Alcock, 1981). Sampling problems, practical difficulties of measuring yield components, and the high co-efficients of variation for these data were discussed. During the course of further investigations on the winter cultivar Jet Neuf (established on approximately 75000 ha in the U. K. during 1980–1) within-plot variability for plant weight was assessed in order to indicate the size of sample necessary to compare treatment means.

Size and shape of sampling units for estimating incidence of sharp eyespot, Rhizoctonia cerealis, in plots of wheat

1982 ◽  
Vol 99 (2) ◽  
pp. 461-464 ◽  
Author(s):  
C. A. Gilligan
Keyword(s):  
Crop Yield ◽  
Stem Canker ◽  
Perfect State ◽  
Size And Shape ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Sharp Eyespot ◽  
Similar Area ◽  
Rhizoctonia Cerealis

It has long been known that the size and shape of sampling units used to assess crop yield may have significant effects upon the precision of the estimates (Smith, 1938; Hudson, 1939) but little is known about the effects when estimating incidence of disease. Gilligan (1980) showed that estimates of the incidence (i.e. presence or absence of disease) of stem canker (Phomx, lingam, perfect state Lepto sphaeria maculans)of oil-seed rape were more precise when large square sampling units rather than long rectangular units of similar area or small square sampling units were used. Moreover, estimates derived from the frequently used method of sampling by removal of 25 stems, supposedly at random from each plot, were shown to be biased.

Cylindrosporium concentricum. [Descriptions of Fungi and Bacteria].

1977 ◽  
Author(s):  
B. C. Sutton
Keyword(s):  
New Zealand ◽  
Geographical Distribution ◽  
Leaf Spot ◽  
South Australia ◽  
Seed Transmission ◽  
Oil Seed ◽  
Oil Seed Rape

Abstract A description is provided for Cylindrosporium concentricum[Pyrenopeziza brassicae]. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Brassica spp. (cabbage, cauliflower, broccoli, brussel sprouts, oil seed rape, swedes). DISEASE: Light leaf spot of Brassicae. GEOGRAPHICAL DISTRIBUTION: Europe (UK, Ireland, Netherlands, Germany, Denmark, Norway, Portugal, Rumania, Latvia); Asia (Japan, Philippines); Australia (South Australia, Tasmania); New Zealand. (CMI Map 193, ed. 2, 1975). TRANSMISSION: By splash-dispersed air-borne conidia. No seed transmission has been demonstrated.

scholarly journals Occurrence of Sclerotinia sclerotiorum (Lib) de Bary and Diaporthe (Phomopsis) helianthi Munt.-Cvet. et al. on Iva xanthiifolia Nutt. in Slovak Republic

2012 ◽  
Vol 47 (No. 2) ◽  
pp. 52-54
Author(s):  
J. Huszár
Keyword(s):  
Sclerotinia Sclerotiorum ◽  
Slovak Republic ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Important Disease

The polyphagous pathogen Sclerotinia sclerotiorum (Lib) de Bary causes significant diseases of sunflower and oil-seed rape while Diaporthe wilt, invoked by the pathogen Diaporthe (Phomopsis) helianthi Munt-Cvet. et al., is another important disease of sunflower in Slovakia. Since 2001 we have identified S.  sclerotiorum on Iva xanthiifolia Nutt. in three locations and the infestation of I. xanthiifolia by D. helianthi  has been observed only in one location of western Slovakia. The infestation of I. xanthiifolia by Sclerotinia disease and by D. helianthi has been observed only after secondary ascospore infection in sunflower fields.

Variation in the protein content of single seeds of four varieties of oil seed rape

1977 ◽  
Vol 28 (12) ◽  
pp. 1065-1070 ◽  
Author(s):  
Jane R. King ◽  
Thomas McNeilly ◽  
David A. Thurman
Keyword(s):  
Protein Content ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Single Seeds

Quantitative analysis of the growth, development and distribution of flowers and pods in oil seed rape (Brassica napus L.)

1975 ◽  
Vol 85 (1) ◽  
pp. 103-110 ◽  
Author(s):  
T. O. Tayo ◽  
D. G. Morgan
Keyword(s):  
Quantitative Analysis ◽  
Brassica Napus ◽  
Growth And Development ◽  
Brassica Napus L ◽  
Flower Opening ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Whole Plant ◽  
Growth Development

SUMMARYThe growth and development of single plants of oil seed rape, variety Zollerngold, are described quantitatively and particular attention paid to the sequence and pattern of flower and pod production on the different inflorescences. The period of flower opening over the whole plant spanned an average of 26 days and more than 75% of the pods which were retained to maturity were formed from flowers which opened within 14 days of anthesis. Most of these flowers were found on the terminal raceme and on the basal and middle regions of the axillary inflorescences arising from the uppermost three nodes.

scholarly journals Sex-biased dispersal and spatial heterogeneity affect landscape resistance to gene flow in fisher

Ecosphere ◽  
2017 ◽  
Vol 8 (6) ◽  
pp. e01839 ◽  
Author(s):  
Jody M. Tucker ◽  
Fred W. Allendorf ◽  
Richard L. Truex ◽  
Michael K. Schwartz
Keyword(s):  
Gene Flow ◽  
Spatial Heterogeneity ◽  
Landscape Resistance
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