Managing Flea Beetles (Phyllotreta spp.) (Coleoptera: Chrysomelidae) in Canola with Seeding Date, Plant Density, and Seed Treatment

2005 ◽  
Vol 97 (6) ◽  
pp. 1570-1578 ◽  
Author(s):  
Lloyd M. Dosdall ◽  
F. Craig Stevenson
Keyword(s):  
Seed Treatment ◽  
Plant Density ◽  
Flea Beetles ◽  
Seeding Date

Effects of seeding date and canola species on seedling damage by flea beetles in three ecoregions

2008 ◽  
Vol 132 (8) ◽  
pp. 623-631 ◽  
Author(s):  
H. A. Cárcamo ◽  
J. K. Otani ◽  
L. M. Dosdall ◽  
R. E. Blackshaw ◽  
G. W. Clayton ◽  
...  
Keyword(s):  
Flea Beetles ◽  
Seeding Date

scholarly journals Fall and spring seeding date effects on herbicide-tolerant canola (Brassica napus L.) cultivars

2004 ◽  
Vol 84 (2) ◽  
pp. 419-430 ◽  
Author(s):  
G. W. Clayton ◽  
K. N. Harker ◽  
J. T. O’Donovan ◽  
R. E. Blackshaw ◽  
L. M. Dosdall ◽  
...  
Keyword(s):  
Field Experiments ◽  
Plant Density ◽  
Early Spring ◽  
Yield Response ◽  
Management Options ◽  
Brassica Napus L ◽  
Seeding Date ◽  
Herbicide Tolerant ◽  
Root Maggot ◽  
Crops Yield

More flexible and effective weed control with herbicide-tolerant B. napus canola allows for additional seeding management options, such as fall (dormant) and early spring (ES) seeding. Field experiments were conducted at Lacombe and Beaverlodge (1999–2001), Didsbury (1999–2000), and Lethbridge (2000–2001), Alberta, Canada, primarily to evaluate the effect of fall (late October-November), ES (late April-early May), and normal spring (NS) (ca. mid-May) seeding dates on glufosinate-, glyphosate-, and imidazolinone-tolerant canola development and yield. Fall seeding resulted in 46% lower plant density and nearly double the dockage than spring seeding. ES-seeded canola had 19% higher seed yield and 2.1% higher oil content than fall-seeded canola. ES seeding significantly increased yield compared to fall-seeded canola for 8 of 10 site -years or compared to NS seeding for 4 of 10 site-years; ES-seeded canola equalled the yield of NS-seeded canola for 6 of 10 site-years. Yield response to seeding date did not differ among herbicide-tolerant cultivars. Seeding date did not influence root maggot damage. Seeding canola as soon as possible in spring increases the likelihood of optimizing canola yield and quality compared to fall seeding and traditional spring seeding dates. Key words: Dormant seeding, seeding management, root maggot, herbicide-resistant crops, yield components, operational diversity

scholarly journals Effects of seeding date and seeding rate on yield, proximate composition and total tannins content of two Kabuli chickpea cultivars

2017 ◽  
Vol 12 (3) ◽  
Author(s):  
Roberto Ruggeri ◽  
Riccardo Primi ◽  
Pier Paolo Danieli ◽  
Bruno Ronchi ◽  
Francesco Rossini
Keyword(s):  
Grain Yield ◽  
Plant Density ◽  
Ascochyta Blight ◽  
Climatic Conditions ◽  
Seeding Rate ◽  
Crude Fibre ◽  
Seeding Date ◽  
Cultivar Selection ◽  
Marked Resistance ◽  
Considerable Range

Experiments were conducted in open field to assess the effect of seeding season and density on the yield, the chemical composition and the accumulation of total tannins in grains of two chickpea (<em>Cicer arietinum</em> L.) cultivars (<em>Pascià</em> and <em>Sultano</em>). Environmental conditions and genetic factors considerably affected grain yield, nutrient and total tannins content of chickpea seeds, giving a considerable range in its qualitative characteristics. Results confirmed cultivar selection as a central factor when a late autumn-early winter sowing is performed. In effect, a more marked resistance to Ascochyta blight (AB) of <em>Sultano</em>, allowed better agronomic performances when favourable-to-AB climatic conditions occur. Winter sowing appeared to be the best choice in the Mediterranean environment when cultivating to maximise the grain yield (+19%). Spring sowing improved crude protein (+10%) and crude fibre (+8%) content, whereas it did not significantly affect the accumulation of anti-nutrients compounds such as total tannins. The most appropriate seeding rate was 70 seeds m–2, considering that plant density had relatively little effect on the parameters studied.

scholarly journals Selectivity of Herbicide Associations with Chemical Protector in the Treatment of Sweet Sorghum Hybrid Seeds

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
C.D.G. MACIEL ◽  
A.M. OLIVEIRA NETO ◽  
N. GUERRA ◽  
G.B. LEAL ◽  
A.A.P. SILVA ◽  
...  
Keyword(s):  
Sweet Sorghum ◽  
Seed Treatment ◽  
Plant Density ◽  
Block Design ◽  
Control Sample ◽  
Naphthalic Anhydride ◽  
Randomized Block Design ◽  
Hybrid Seeds ◽  
Stalk Yield

ABSTRACT Sweet sorghum culture is an alternative to sugar and ethanol production. With the aim of evaluating herbicide tank-mix selectivity associated or not to sweet sorghum seed treatment with naphthalic anhydride, two experiments with ESX5200 and EJX7C5110 hybrids were performed in red oxisol (clayey) field conditions, in the municipality of Campo Mourão, Paraná state. A randomized block design was used, with 4 x 2 factorial scheme, with four replications. The first factor represented three herbicide associations and a control sample without herbicide, and the second factor was constituted by the absence or presence of seed treatment with naphthalic anhydride (5.0 g kg-1). Herbicide treatments were tank-mixes of atrazine + S-metolachor (2,640 + 480 g ha 1) (pre-emergence); atrazine + S-metolachlor + isoxaflutole (2,640 + 480 + 11.25 g ha-1) (pre-emergence) and atrazine + S-metolachlor (1,500 + 384 g ha-1) (post-emergence). The following characteristics were evaluated: intoxication, plant height, stalk diameter, number of internodes per stalk and plant density, performed 60 days after emergence (DAE); stalk yield and Brix, were evaluated on day 85 DAE. Atrazine + S-metolachlor tank-mix applied in pre or post-emergence did not affect growth, development, yield and stalk quality of the ESX5200 and EJX7C5110 sweet sorghum hybrids. Sweet sorghum seed treatment with naphthalic anhydride provided partial protection against the action of atrazine + s-metolachlor + isoxaflutole tank-mixes, being more evident for the ESX5200 hybrid.

When is fall feeding by flea beetles (Phyllotreta spp., Coleoptera: Chrysomelidae) on canola (Brassica napus L.) a problem?

2012 ◽  
Vol 92 (1) ◽  
pp. 97-107
Author(s):  
Juliana J. Soroka ◽  
Larry F. Grenkow
Keyword(s):  
Brassica Napus ◽  
Field Experiments ◽  
Flea Beetle ◽  
Brassica Napus L ◽  
Late Season ◽  
The Third ◽  
Flea Beetles ◽  
Seeding Date ◽  
Seed Yields

Soroka, J. J. and L. F. Grenkow. 2012. When is fall feeding by flea beetles ( Phyllotreta spp., Coleoptera: Chrysomelidae) on canola ( Brassica napus L.) a problem? Can. J. Plant Sci. 92: 97–107. Two cultivars of Brassica napus canola were seeded in mid-May and early June in three field experiments in each of 3 yr near Saskatoon, Saskatchewan, to determine the effects of late-season flea beetle feeding on seed yields. In the first experiment, canola was sprayed with insecticide late in the summer to eliminate naturally-infesting flea beetles. In the second, 1×1×1.5 m screen cages were placed over early- and late-seeded canola at flowering and infested with flea beetles as canola matured. In the third investigation, sleeve cages were placed over individual plants and infested with 100 flea beetles. Flea beetles had no detrimental effects on early-seeded canola in any experiment, but did affect seed yields of late-seeded plots in some trials. Over two cultivars in 1 year, late-seeded plants in cube cages infested with about 350 flea beetles per plant when lower pods were turning from translucent to green in colour reduced yield by 241 kg ha−1 over control yields. Seed weights in these late-seeded plots were decreased from 2.68 g per 1000 seeds in uninfested cages to 2.44 g per 1000 seeds in infested cages. Populations of 100 flea beetles per plant in sleeve cages had no effect on harvest parameters in any seeding date or year.

scholarly journals INSECTICIDE SEED TREATMENT EFFICACY AGAINST FLEA BEETLES ON CANOLA TRIAL A, 2006

2007 ◽  
Vol 32 (1) ◽  
Author(s):  
Janet Knodel ◽  
Bryan Hanson ◽  
Bob Henson ◽  
Denise Markle
Keyword(s):  
Treatment Efficacy ◽  
Seed Treatment ◽  
Flea Beetles

Effect of seeding date and rate on desi chickpea in southern Alberta

2006 ◽  
Vol 86 (3) ◽  
pp. 717-721
Author(s):  
R. H. McKenzie ◽  
A. B. Middleton ◽  
E. Bremer
Keyword(s):  
Cicer Arietinum ◽  
Plant Density ◽  
Field Trials ◽  
Cicer Arietinum L ◽  
Seeding Date ◽  
Large Yield ◽  
Southern Alberta ◽  
Plant Densities ◽  
Seed Yields ◽  
Target Plant

Field trials were conducted at 12 location-years (sites) over a 4-yr period (2000–2003) to determine the response of desi chickpea (Cicer arietinum L.) to seeding date and rate in southern Alberta. Desi chickpea, cv. Myles, was planted on three dates at approximately 10-d intervals at target plant densities of 20, 40, 60, 80 and 100 plants m-2. Seed yields were close to maximum at seeding dates ranging from late April till mid-May, but further delays in seeding resulted in modest yield declines at two sites during the drought years and large yield declines at two sites in the wet year. The economic optimum plant density for desi chickpea increased with moisture availability, from 26 to 79 plants m-2. Under typical conditions in southern Alberta, optimum yields of chickpea were obtained with seeding dates prior to May 15 and seeding rates of 30 to 40 plants m-2. Key words: Cicer arietinum, yield, planting, sowing

scholarly journals OPTIMIZATION OF THE OF SUNFLOWER CROPS STRUCTURE IN TECHNOLOGIES WITH RETARDANTS APPLICATION

2021 ◽  
Vol 2 (7(71)) ◽  
pp. 22-26
Author(s):  
V. Yatsenko ◽  
H. Zhatova ◽  
I. Kolosok
Keyword(s):  
Seed Treatment ◽  
Plant Density ◽  
Experimental Studies ◽  
Treatment Plant ◽  
Forest Steppe ◽  
Stem Height ◽  
Technological Parameters ◽  
Crop Density ◽  
Basic Level ◽  
Plant Treatment

The results of experimental studies to determine the actual changes in stem height, plant productivity and sunflower yield depending on the plant density and different variants of retardant application are presented in the article. The research was carried out in a model field experiment with a density gradient from 19.84 to 160.0 thousand plant / ha. The aim of the research was to determine the optimal parameters of the crop structure of new sunflower Choral hybrid in the technology with retardant application. It has been established that the optimal variant for ensuring the technological parameters of the plant height of the Choral hybrid in the northeastern Forest-Steppe of Ukraine was the complex application of Moddus retardant according to the scheme "seed treatment + plant treatment in the phase of 8-10 leaves". To maintain the basic level of yield, it is proposed to increase the calculated indicators of the final (pre-harvest) crop density from 56.5 to 73.1 thousand plants / ha.

Effects of Plant Density and Seeding Date on Accumulation and Translocation of Dry Matter and Nitrogen in Winter Wheat Cultivar Lankao Aizao 8

2009 ◽  
Vol 35 (1) ◽  
pp. 124-131 ◽  
Author(s):  
Hui-Juan QU ◽  
Jin-Cai LI ◽  
Xue-Shan SHEN ◽  
Feng-Zhen WEI ◽  
Cheng-Yu WANG ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Dry Matter ◽  
Plant Density ◽  
Wheat Cultivar ◽  
Winter Wheat Cultivar ◽  
Seeding Date
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