DISEASES AND PESTS OF GRASS SEED CROPS

1990 ◽  
Vol 5 ◽  
pp. 25-27
Author(s):  
R.E. Falloon
Keyword(s):  
Soil Moisture ◽  
Seed Production ◽  
Seed Quality ◽  
Unit Area ◽  
Crop Growth ◽  
Seeding Rate ◽  
Sowing Time ◽  
Grass Seed ◽  
Crop Establishment ◽  
Seed Crops

This paper will discuss the diseases and pests that affect grass seed production. In order to put the diseases and pests into perspective, the principlesof grass seed production will be considered. The components of yield of any crop for which seed is the product are: number of plants per unit area; number of inflorescences per plant; number of seeds per inflorescence; seed weight, Many factors can influence these components, for example: (1) crop establishment (cultivation, seed quality, seeding rate, sowing time, soil moisture and fertility can all affect numbers of plants) (2) crop growth (soil moisture, fertility, grazing and weeds can affect crop growth and influence numbers of inflorescences and numbers and weight of seeds).

scholarly journals Recent grass seed production studies in Canterbury

1980 ◽  
Vol 1 ◽  
pp. 12-14
Author(s):  
K.R. Brown
Keyword(s):  
Seed Production ◽  
Plant Density ◽  
Stem Elongation ◽  
Seeding Rate ◽  
Grass Seed ◽  
Time Of Application ◽  
Negative Effect ◽  
High Yields ◽  
Seed Crops ◽  
Seed Yields

Seed production trials in Canterbury have shown (1) strong negative relationships between plant density and seed yields per plant, and (2) plant density ranges above which high plant numbers failed to compensate for low yields per plant and below which high yields per plant failed to compensate for low plant numbers. The net result was that seed yields per unit area tended to plateau at this density range, with no further gains being made by increasing plant numbers. It is concluded that the function of seeding rate is to provide sufficient viable seeds to attain this density. Optimum density ranges for 'Grasslands Tama' Westerwolds ryegrass and 'Grasslands Nui' perennial ryegrass were 300 to 400 plants/m, and for 'Grasslands Matua' prairie grass 100 to I30 plants/m. The value of superphosphate and potassic fertilizers for seed production was doubtful, but nitrogen increased seed yields regardless of time of application. Work in Canterbury concentrated on the time of N application and showed that nitrogen for seed production was most efficient when applied just after stem elongation had commenced. Grazing grass-seed crops reduced seed yields because of an indirect negative effect on seedhead size and individual seed weights, both of which proved to be more important than seedhead numbers in determining seed yields. Keywords: Seed production, grasses, plant density, nitrogen, stem elongation, grazing, seedhead size, seed weight.

Effect of method and time of application of nitrogen fertiliser on yield and quality of seed of creeping red fescue

2000 ◽  
Vol 80 (4) ◽  
pp. 809-811 ◽  
Author(s):  
N. A. Fairey ◽  
L. P. Lefkovitch
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Seed Quality ◽  
Early Spring ◽  
Festuca Rubra ◽  
Grass Seed ◽  
Red Fescue ◽  
Time Of Application ◽  
Vigorous Plant ◽  
Tiller Density

Six trials were conducted on commercial seed fields of creeping red fescue (Festuca rubra L. var. rubra) in the Peace region to evaluate the sensitivity of seed production to the method and time of application of N fertiliser. In each trial, 68 kg ha−1 N was applied using three methods (surface-broadcast, granular, ammonium nitrate 34-0-0; foliar/soil spray of 28-0-0 solution N; soil-injected 28-0-0 solution N) at each of three times (fall, early spring, late spring). No statistically significant (P = 0.05) interaction, or main effect, of method and time of N were revealed for seed yield, fertile tiller density or for several seed quality characteristics. Seed yield varied greatly among trials (142 to 1240 kg ha−1) and averaged 566 kg ha−1. The results indicate that there is considerable flexibility in the method and time of application of N fertiliser for seed production of creeping red fescue in the Peace region, provided it is applied before the commencement of vigorous plant growth in the spring. Key words: Creeping red fescue, Festuca rubra L., nitrogen fertility, grass seed production, grass seed quality

scholarly journals Some basic concepts of pasture seed mixtures for New Zealand farms

1991 ◽  
pp. 37-40
Author(s):  
J.F.L. Charlton
Keyword(s):  
New Species ◽  
New Zealand ◽  
Seed Production ◽  
Seedling Establishment ◽  
Early Years ◽  
Seeding Rate ◽  
Sowing Time ◽  
Potential Problems ◽  
Basic Concepts ◽  
Species Mixtures

Seeds mixtures for New Zealand pastures developed from British practices with sowing of multi-species seeds mixtures during early years of settlement. Breeding and seed production of ryegrasses and clovers in the 1930s led to use of simple mixtures, still the most commonly used. Since the mid 197Os, new species have been released, and are now becoming more popular. Advantages and some potential problems of species mixtures are outlined, and simple concepts of compiling seeds mixtures are explained, with particular reference to seeding rate and sowing time. Keywords species, seeds mixtures, pasture renewal, sowing rates, seedling establishment, competition

scholarly journals GRASS SEED PRODUCTION: WEEDS, HERBICIDES AND FERTILISERS

1985 ◽  
Vol 2 ◽  
pp. 15-22
Author(s):  
M.P. Ralston ◽  
K.R. Brown ◽  
M.D. Hare ◽  
K.A. Young
Keyword(s):  
Seed Production ◽  
Stem Elongation ◽  
Grass Species ◽  
Wild Oat ◽  
Weed Species ◽  
Grass Seed ◽  
Prairie Grass ◽  
Seed Crops ◽  
Seed Yields ◽  
Bromus Mollis

Four weed species (Bromus mollis, Vulpia sp., Poa annua, Steltaria media) occur in 30% or more of all perennial ryegrass seed samples. Of the listed undesirable species, Avena fatua (wild oat) and Hordeum murinum occurred respectively in 5.3 and 3.5% of ryegrass seedlots. Only 6 herbicides are registered for use in grass seed crops in New Zealand, 2 for wild oat, and 4 for broadleaved weeds. The results of research on weed control in seedling and established seed crops (ryegrass, cocksfoot, tall fescue, phalaris, prairie grass) are presented. Fertilisers for grass seed crops discussed are nitrogen (N), phosphorus (P), potassium (K), lime and zinc. Autumn N is commonly used and will increase seed yields in early flowering species (Pestuca rubra, F. arundinacea), but in ryegrass variable results have occurred. Spring N should be applied at stem elongation. No responses to P have been reported for ryegrass, while in established cocksfoot responses to P and K have been reported. Overliming can induce Zn deficiencies, and of the grass species only prairie grass may require lime. Keywords: Lolium, ryegrass, seed production, weed occurrence, Bromus mollis, herbicides, fertilisers, nitrogen, phosphorus, potassium, lime, zinc

scholarly journals Amenity grass seed production in practice

1980 ◽  
Vol 1 ◽  
pp. 31-33
Author(s):  
A.G. Wright
Keyword(s):  
Seed Production ◽  
Poa Pratensis ◽  
Festuca Rubra ◽  
Grass Seed ◽  
Agrostis Tenuis ◽  
Seed Harvesting ◽  
Seed Crops

The growing and harvesting of amenity grass seed crops requires special management and also modifications and adjustments to header harvesters for the various cultivars. Keywords: Amenity grass, seed production, seed harvesting, Agrostis tenuis, Agrostis pelustris, Festuca rubra, Poa pratensis

scholarly journals First Report of Curly Top of Coriandrum sativum Caused by Beet curly top virus in the Columbia Basin of Washington State.

Plant Disease ◽  
2021 ◽  
Author(s):  
Kylie D. Swisher Grimm ◽  
James Crosslin ◽  
Rodney Cooper ◽  
Kenneth Frost ◽  
Lindsey J. du Toit ◽  
...  
Keyword(s):  
Seed Production ◽  
Management Practices ◽  
Seed Quality ◽  
Coriandrum Sativum ◽  
Columbia Basin ◽  
Yield Losses ◽  
Beet Leafhopper ◽  
Beet Curly Top Virus ◽  
Pcr Assays ◽  
Seed Crops

Two fields of coriander (Coriandrum sativum L.) seed crops of proprietary cultivars were observed in the Columbia Basin of Washington in July 2020 with 40 and 90% incidence of plants showing stunting and leaf and stem discoloration, sometimes with mild leaf curl. Foliar discoloration ranged from yellow to red and purple. Sweep-netting along the field edges collected one beet leafhopper (Circulifer tenellus Baker; BLH), the known vector of Beet curly top virus (BCTV), Beet leafhopper transmitted virescence agent (BLTVA) phytoplasma, and Spiroplasma citri, all of which affect Solanaceae and Apiaceae crops in Washington (Crosslin et al. 2006; Johnson and Martin 1998; Lee et al. 2006). Nucleic acids extracted from leaves and petioles of 12 coriander plants (8 from Field 1 and 4 from Field 2) using the Dellaporta method, and from the BLH using the CTAB method (Crosslin et al. 2006) were subjected to PCR assays to detect the BLH-transmitted pathogens which cause yellow and purple discoloration in potato (Solanum tuberosum L.) and carrot (Daucus carota subsp. sativus (Hoffm.) Arc.) in this region. BLTVA was targeted using a species-specific nested PCR assay with primers P1 and P7, followed by primers FU5 and BLTVA-int (Crosslin et al. 2006); S. citri was targeted using primers P89-F and P89-R (Yokomi et al. 2008); and BCTV was targeted using curtovirus primers BCTV2-F and BCTV2-R (Strausbaugh et al. 2008). BLTVA and S. citri were not detected in the plants, but curtovirus was detected in 10 of the 12 plants. All three pathogens were detected from the single BLH. A 519 bp region of the curtovirus capsid protein gene was amplified from seven plants (5 from Field 1 and 2 from Field 2) and the BLH, and cloned into TOP10 Escherichia coli cells using the pCR-2.1 TOPO vector (Invitrogen, Carlsbad, CA). Three clones were sequenced from each sample. For each of six plant samples and the BLH, the three clones were identical and consensus sequences were generated (GenBank Accessions MW234419 to MW234425). For the seventh plant, two clones were identical in sequence (MW234426) and the third contained 12 single nucleotide polymorphisms (MW234427). All sequences were subjected to an NCBI BLASTn analysis and showed 98.3 to 99.8% identity with BCTV sequences. Additional PCR assays with primers BMCTV-C1 2213F and BMCTV-C1 2609R (Strausbaugh et al. 2008), targeting the C1 gene of the Worland strain of BCTV, detected BCTV-Worland-like strains in all plants and the BLH, confirming that BCTV was present and indicating that the strain-specific primer pair was more sensitive than the universal curtovirus primers. Yield losses in the two fields were approximately 60%, with reduced seed size but not seed quality. BCTV infections in coriander crops have been observed in the Columbia Basin in 2002, 2005, 2008, and 2013, with yield losses ranging from 10 to 100% per field, though official reports were not made following the diagnoses (Crosslin, du Toit, and Frost, unpublished data). BCTV has caused millions of dollars of losses in the U.S. in crops such as sugar beet (Beta vulgaris subsp. vulgaris L.), tomato (S. lycopersicum L.), and pepper (S. annuum L.) (Johnson and Martin 1998). This is the first publication of BCTV affecting seed production of the specialty crop C. sativum. The observation of 90% incidence of symptoms in one field suggests that resistant cultivars and/or insect pest management practices are needed to prevent significant impacts of BCTV on coriander seed production in this semi-arid region.

scholarly journals RESULTS OF FIELD RESEARCHES OF PELLETED BUCKWHEAT SEEDS WITH ORGANIC FERTILIZERS BASED ON HUMIC ACIDS WITH SUBSTANTIATION OF CONSTRUCTIVE AND TECHNOLOGICAL PARAMETERS OF CENTRIFUGAL PELLETER WITH BLADE REFLECTOR

2018 ◽  
Vol 56 (3) ◽  
pp. 357-365
Author(s):  
V. R. Petrovets ◽  
D. A. Mikheev
Keyword(s):  
Humic Acids ◽  
Crop Production ◽  
Seed Quality ◽  
Experimental Studies ◽  
Spherical Shape ◽  
Organic Fertilizers ◽  
Technological Parameters ◽  
Seeding Rate ◽  
Presowing Treatment ◽  
Seed Crops

One can obtain high yields of crops only when seeds with high varietal and sowing qualities are used for sowing. Various methods of presowing processing are used to improve the seed quality. Presowing seed treatment not only improves germination, but also eliminates seeds from pathogens, significantly increases their viability and improves young crops yield. One of the most promising ways of presowing treatment of small and irregular shape seeds is pelleting. This method helps to increase the seeds size and acquire a spherical shape, which greatly simplifies their sowing and allows to accurately observe the seeding rate. The paper presents design of a centrifugal pelleter with blade reflector, the results of studying the process of buckwheat seeds pelleting, and its best design and technological parameters are determined based on those when organic fertilizers based on humic acids were used as material for pelleting. Factors significantly affecting seed pelleting in a centrifugal pelleter with blade reflector were determined, the choice of objective function and criterion for improving the process are substantiated. A dependence describing the process of seed pelleting in a pelleter was obtained as a result of the regression analysis of the obtained results of experimental studies. The obtained results can be used in the field of crop production in agricultural production during presowing treatment of small seed crops and agricultural engineering during development of centrifugal pelleters with blade reflectors.

INFLUENCE OF LOW SEEDING RATES ON WHEAT YIELD IN SOUTHWESTERN SASKATCHEWAN

1969 ◽  
Vol 49 (5) ◽  
pp. 607-614 ◽  
Author(s):  
W. L. Pelton
Keyword(s):  
Soil Moisture ◽  
Field Experiment ◽  
Spring Wheat ◽  
Unit Area ◽  
Wheat Yield ◽  
Moisture Stress ◽  
Plant Population ◽  
Population Differences ◽  
Seeding Rate ◽  
Plant Survival

Spring wheat seeding rates of 22, 45, 67, and 101 kg/ha were compared in a field experiment on a medium-textured soil at Swift Current, Saskatchewan, over the period 1960–1968. Data collected during eight years indicated that when weeds, insects and diseases were chemically controlled, low seeding rates produced significantly more grain than higher seeding rates, with greatest increases occurring during years of severe moisture stress. Low seeding rates produced longer heads, heavier kernels, and in some cases taller plants. Plant population differences resulting from the variation in seeding rate were largely eliminated by plant survival and tillering. The number of mature kernels per unit area did not differ significantly for all treatments.Seeding rates had an effect on the rate at which moisture was used by the crop. Soil moisture supplies were quickly exhausted on plots seeded at rates of 67 and 101 kg/ha, whereas moisture was available to the crop seeded at lower rates over a longer period. The crop seeded at 22 kg/ha matured 3 to 5 days later than that seeded at 101 kg/ha.

scholarly journals The Optimum Plant Density for Vigorous Seed Production in Safflower

2019 ◽  
Vol 7 (2) ◽  
pp. 301
Author(s):  
İsmail Özaşık ◽  
Mehmet Demir Kaya ◽  
Engin Gökhan Kulan
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Seed Quality ◽  
Plant Density ◽  
Seed Vigor ◽  
Row Spacing ◽  
Seeding Rate ◽  
Vigorous Seed ◽  
Emergence Percentage ◽  
Laboratory Emergence

Seed viability and vigor have been influenced by several factors including soil and climatic conditions, plant nutrition, fertilization, irrigation, plant population and post-harvest storages. The study was conducted to determine the appropriate plant density for vigorous seed production in safflower. The effects of row spacing (14 and 28 cm) and seeding rate (40, 80, 120, 160 and 200 seeds m-2) on yield, yield components and seed quality of safflower were detected in the study. The results showed that increased seeding rates resulted in enhanced seed yield and the highest seed yield was obtained from 14 cm and 200 seed m-2 with 3320 kg ha-1. The row spacing and seeding rate did not cause a significant difference in oil and protein contents. Laboratory emergence, germination after accelerated ageing (AA) and electrical conductivity tests were suitable for determining seed quality among the seed lots, while standard germination, cool and cold tests were not appropriate. The highest laboratory emergence percentage and germination after AA were determined in 80 seed m-2 but field emergence percentage in 120 seed m-2. It was concluded that the 14 cm row spacing and seeding rate of 120 seed m-2 should be advised for high yielding seed production regardless of seed vigor in safflower.

Seeding rate, time of sowing and fertilizers for subterranean clover seed production

1973 ◽  
Vol 13 (65) ◽  
pp. 681 ◽  
Author(s):  
BJ Quinlivan ◽  
AC Devitt ◽  
CM Francis
Keyword(s):  
Seed Production ◽  
Seed Set ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Major Effect ◽  
Seeding Rate ◽  
Sowing Time ◽  
Commercial Crop ◽  
Clover Seed ◽  
High Phosphate

In two experiments in successive years on a sandy soil in Western Australia, seed production of subterranean clover (Trifolium subterraneum) when sown as a commercial crop was greatly influenced by time of sowing, phosphate rates and seeding rate. Early (April) sowing, high phosphate (up to 600 kg ha-1) and higher seeding rates (up to 24 kg ha-1) all increased seed set but the major effect was that of earliness of sowing. Time of sowing interacted with phosphate rates, the time of sowing differences being only fully expressed at high phosphate rates. Artificial nitrogen applied had a significant effect on seed yield in one of the trial years.

Sign in / Sign up

Export Citation Format

Share Document