Size doesn’t matter: The effects of seed size and seeding rate on injury by root maggots (Delia spp., Diptera: Anthomyiidae) to canola (Brassica rapa L. and B. napus L.)

2006 ◽  
Vol 86 (3) ◽  
pp. 907-909 ◽  
Author(s):  
J. J. Soroka ◽  
R. H. Elliott
Keyword(s):  
Key Words ◽  
Seed Size ◽  
Brassica Rapa ◽  
Root Diameter ◽  
Seeding Rate ◽  
Small Seed ◽  
Root Maggot

In 16 experiments at two locations over six years, seed size had no effect on feeding levels by crucifer-feeding root maggots (Delia spp.) in Brassica rapa nor in B. napus. Root maggot injury in B. rapa declined as seeding rates increased. Damage to plants grown from small seed increased as root diameter increased. Key words: Canola, Delia spp., root maggot injury, seeding rate, seed size, root diameter

Introgression of long pod genotype from spring rape (Brassica napus L.) into summer turnip rape (Brassica rapa L.)

2001 ◽  
Vol 81 (1) ◽  
pp. 59-60 ◽  
Author(s):  
L. J. Lewis ◽  
D. L. Woods ◽  
B. F. Cheng
Keyword(s):  
Brassica Napus ◽  
Key Words ◽  
Seed Size ◽  
Brassica Rapa ◽  
Interspecific Hybridisation ◽  
Brassica Napus L ◽  
Turnip Rape ◽  
Pod Length ◽  
Spring Rape

Long pod character from a summer Brassica napus L. line was introgressed into turnip rape B. rapa L. cultivar AC Sunshine resulting in progeny lines with significantly longer pods and larger seed size than those of AC Sunshine, but producing no yield advantage. Key words: Brassica rapa, Brassica napus, pod length, summer turnip rape, spring rape, interspecific hybridisation

THE INFLUENCE OF SEED SIZE AND SEEDING RATE ON YIELD AND YIELD COMPONENTS OF BARLEY

1963 ◽  
Vol 43 (3) ◽  
pp. 330-337 ◽  
Author(s):  
Ahmet Demirlicakmak ◽  
M. L. Kaufmann ◽  
L. P. V. Johnson
Keyword(s):  
Seed Size ◽  
Yield Components ◽  
Field Experiments ◽  
Yield Response ◽  
Seeding Rate ◽  
Kernel Weights ◽  
Yield And Yield Components ◽  
Poor Indicator ◽  
Small Seed ◽  
Size Interaction

Field experiments with three seed sizes and three seeding rates of each of three barley varieties were conducted in 1959 and 1960 at Edmonton and Lacombe, Alberta. Data were obtained on emergence, culm counts, grain yields, and 1000-kernel weights. Although there was no effect of seed size on emergence, the culm counts and yields were highest for large seed and lowest for small seed over all rates, varieties, and tests. The differences between yields from large and small seed decreased slightly as the seeding rate increased, but the seeding-rate × seed-size interaction was not statistically significant. There were varietal differences in yield response to seeding rates. It was, therefore, concluded that seeding rates in test plots should conform to those used in farming practice. The rate of seeding had a significant influence on 1000-kernel weights. The lowest rate produced the heaviest kernels and the highest rate produced the lightest kernels in each of four tests. Tillering capacity alone was a poor indicator of resulting yields. Results from further experiments, involving four seed categories of nine varieties in two tests, corroborated the above findings.

Do applications of sulfur or sulfate influence infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) in canola?

2002 ◽  
Vol 82 (3) ◽  
pp. 599-610 ◽  
Author(s):  
L. M. Dosdall ◽  
R. -C. Yang ◽  
P. M. Conway
Keyword(s):  
Brassica Rapa ◽  
Field Experiments ◽  
Elemental Sulfur ◽  
Insect Pest ◽  
Soil Surface ◽  
Application Rate ◽  
Delia Radicum ◽  
Application Methods ◽  
Root Maggot ◽  
Sulfur Nutrition

While the importance of sulfur nutrition for the development of healthy stands of canola is well documented, the role of sulfur in the management of insect pest infestations has not previously been investigated in this crop. Field experiments were conducted at three sites in central Alberta in 1997 and 1998 to determine the influence of sulfur and sulfate applications on infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) in canola (Brassica rapa L.). Different formulations (granules, powder, prills, and sprays), application methods (either drilled in with the seed or top-dressed on the soil surface), and application rates were evaluated. To assess the degree of root maggot infestation, oviposition throughout the season and damage to taproots at the end of the season were monitored. Sulfur contents were analyzed from leaf samples collected mid-season and seed yields were measured from all treatment plots. Root maggot responses to the different sulfur treatments and application methods varied among years and sites, indicating that environmental factors have great importance in determining infestation levels by these pests, and the oxidation rate of elemental sulfur in soil. Sulfur formulation and application rate had significant effects on root maggot egg deposition and root damage for some sites and years, but even at high rates of application (112 kg ha-1) reductions in infestation levels were not substantial relative to the controls. While sulfur additions alone will not greatly reduce root maggot infestation levels in canola, growers should employ adequate sulfur nutrition for optimum crop health to enable plants to better compensate for damage by these pests. Key words: Brassica rapa, Delia radicum, Delia floralis, elemental sulfur, sulfate, canola

scholarly journals Nattoking K86 soybean

1991 ◽  
Vol 71 (3) ◽  
pp. 855-856 ◽  
Author(s):  
N. R. Bradner ◽  
R. D. Simpson ◽  
A. A. Hadlock
Keyword(s):  
Glycine Max ◽  
Key Words ◽  
Seed Size ◽  
Maturity Group ◽  
Yield Performance ◽  
Glycine Max L ◽  
Cultivar Description

NattoKing K86 is a Maturity Group 00 soybean (Glycine max (L.) Merr.) cultivar having higher yield performance, smaller seed size, and later maturity than Canatto. Key words: Glycine max, NattoKing K86 cultivar, cultivar description, soybean

Hysyn100 summer turnip rape

1996 ◽  
Vol 76 (1) ◽  
pp. 127-128 ◽  
Author(s):  
K. C. Falk ◽  
F. M. Stoenescu
Keyword(s):  
Key Words ◽  
Brassica Rapa ◽  
Western Canada ◽  
Turnip Rape ◽  
Cultivar Description ◽  
Canola Quality

Hysyn100 summer turnip rape (Brassica rapa L.) is a canola-quality population-synthetic (Syn1) with high oil and protein contents that is well adapted to the short- and mid-season growing areas of western Canada. Key words: Turnip rape (summer), synthetic, cultivar description

Seed size as a determinant of germination rate in Crepis tectorum (Asteraceae): evidence from a seed burial experiment

1996 ◽  
Vol 74 (4) ◽  
pp. 568-572 ◽  
Author(s):  
Stefan Andersson
Keyword(s):  
Seed Size ◽  
Germination Rate ◽  
Local Population ◽  
Seed Viability ◽  
Seed Burial ◽  
Small Seed ◽  
Crepis Tectorum ◽  
Winter Annual ◽  
Selection For ◽  
The Relationship

The present study of the winter annual Crepis tectorum examines the relationship between seed (achene) size and the extent to which seeds resist germination during the year of their production. I carried out two seed burial experiments, one at an outcrop site occupied by a small-seeded population, and another in an experimental garden with soil from the same field site, with seeds representing the local population and a segregating generation of a cross between two other populations. Using logistic regression with data corrected for seed viability, I found an association between small seed size and failure to germinate in the first autumn. The small seed size characterizing many outcrop populations may have evolved as a response to selection for delaying germination in a habitat subject to unpredictable droughts during the growth season. Keywords: Crepis tectorum, germination, seed bank, seed size.

Effects of seed size and seed weight on seedling establishment, seedling vigour and tolerance of summer turnip rape (Brassica rapa) to flea beetles, Phyllotreta spp.

2007 ◽  
Vol 87 (2) ◽  
pp. 385-393 ◽  
Author(s):  
R. H. Elliott ◽  
L. W. Mann ◽  
O. O. Olfert
Keyword(s):  
Seed Size ◽  
Brassica Rapa ◽  
Seedling Establishment ◽  
Seed Weight ◽  
Flea Beetle ◽  
Dry Weight ◽  
Seedling Vigour ◽  
Shoot Dry Weight ◽  
Flea Beetles ◽  
Beetle Damage

A 3-yr study was conducted on three synthetic Brassica rapa L. cultivars to determine the effects of seed size and seed weight on seedling establishment, seedling growth and susceptibility to feeding damage by flea beetles, Phyllotreta spp. (Coleoptera: Chrysomelidae). Seed lots of AC Boreal, Fairview and Hysyn 110 were sieved to obtain small, medium and large seeds (1.4–1.6, 1.6–1.8 and 1.8–2.0 mm, respectively). In the laboratory, seedlings grown from large seeds had the largest cotyledons, highest shoot dry weight and highest biomass. Shoot weights increased as seed size increased. Sized seeds of the three cultivars were grown in the field without insecticides in 1998–2000. Seedlings of small seeds had the highest flea beetle damage and poorest seedling establishment. Shoot dry weight and biomass 14–35 d after planting increased as seed size and seed weight increased. Compared with small seeds, large seeds improved shoot dry weight, biomass and seed yield by 13–43, 25–57 and 12%, respectively. Results indicated that seedlings of medium and large seeds are more vigorous and tolerant to flea beetle damage than seedlings of small seeds. Tolerance was due to a higher initial seedling weight rather than higher relative growth rate. Shoot dry weights, biomass and yield of the three cultivars were more strongly correlated with 1000-seed weight than with seed diameter. Key words: Canola, flea beetles, seed size, seedling vigour, tolerance, seed weight

Susceptibility of mungbean varieties to the bruchid species Callosobruchus maculatus (F.), C. phaseoli (Gyll.), C. chinensis (L.), and Acanthoscelides obtectus (Say.) (Coleoptera:Chrysomelidae)

2000 ◽  
Vol 51 (1) ◽  
pp. 85 ◽  
Author(s):  
C. J. Lambrides ◽  
B. C. Imrie
Keyword(s):  
Seed Size ◽  
Seed Coat ◽  
Callosobruchus Maculatus ◽  
Acanthoscelides Obtectus ◽  
Oviposition Deterrents ◽  
Bruchid Resistance ◽  
Small Seed ◽  
Biochemical Resistance ◽  
Acanthoscelides Obtectus Say

Twenty-six mungbean varieties and accessions were screened for resistance to 4 bruchid species (Coleoptera : Chrysomelidae). On the basis of the percentage of seeds damaged all Australian commercial mungbean varieties tested here were highly susceptible to strains of Callosobruchus maculatus and C. chinensis, the 2 species that cause most damage worldwide to mungbean in storage. In addition, 3 accessions of wild mungbean appeared to have bruchid resistance. The texture layer present on the seed coat of some mungbean varieties and small seed size may act as oviposition deterrents. Consequently, these assays for determining resistance to bruchid infestation may not be suitable for identifying biochemical resistance of some mungbean genotypes.

Dormancy, small seed size and low germination rates contribute to low recruitment in Desmodium cuspidatum (Fabaceae)

2010 ◽  
Vol 137 (4) ◽  
pp. 355-365 ◽  
Author(s):  
Krissa A. Skogen ◽  
Logan Senack ◽  
Kent E. Holsinger
Keyword(s):  
Seed Size ◽  
Small Seed
Sign in / Sign up

Export Citation Format

Share Document