Effects of different cultural practices on spread of cucumber mosaic virus in narrow-leafed lupins (Lupinus angustifolius)

1999 ◽  
Vol 50 (6) ◽  
pp. 985 ◽  
Author(s):  
A. M. Bwye ◽  
R. A. C. Jones ◽  
W. Proudlove
Keyword(s):  
Grain Yield ◽  
Cucumber Mosaic Virus ◽  
Mosaic Virus ◽  
Field Experiments ◽  
Cultural Practices ◽  
Lupinus Angustifolius ◽  
Row Spacing ◽  
Virus Spread ◽  
Current Season ◽  
Wide Row Spacing

Lupinus angustifolius (narrow-leafed lupin) was sown in 7 field experiments to examine the effects of cultural practices on incidence of cucumber mosaic virus (CMV). The factors investigated were row spacing, banding fertiliser below seed, straw groundover, and tillage. The seed sown carried 5–15% CMV infection. Seed-infected plants were the primary source for subsequent virus spread by aphids. Incidence of seed-infected plants and the extent of virus spread were gauged by counting numbers of lupin plants showing typical seed-borne and current-season CMV symptoms. Due to greater competition with other plants within wide than narrow rows, wide row spacing diminished the survival of seed-infected plants by 46%. Increased plant growth from banding superphosphate below seed did not significantly decrease numbers of seed-infected plants surviving. Straw spread on the soil surface suppressed final CMV incidence by 25–40% and, when applied at different rates, diminished recorded CMV incidence more at 4 than 2 t/ha and least at 1 t/ha. Where there was no straw, CMV incidence increased faster with narrow spacing than wide spacing. Soil disturbance from sowing seed with double discs instead of tynes significantly increased incidences of both seed-borne and current-season infection and diminished grain yield. Neither straw nor row spacing treatments significantly affected grain yield, but the decrease in CMV spread due to straw ground cover significantly increased individual seed weight once and overall yields were greater with straw. Myzus persicae was the main colonising aphid species but Aphis craccivora and Acyrthosiphon kondoi also colonised the lupins. There were significantly fewer colonising M. persicae in plots with 4 t/ha of straw than in those with none. This work suggests that stubble retention, minimum tillage, and wide row spacing should be included as components of an integrated disease management strategy for CMVin L. angustifolius crops.

Effects of sowing seed with different levels of infection, plant density and the growth stage at which plants first develop symptoms on cucumber mosaic-virus infection of narrow-leafed lupins (Lupinus angustifolius)

1994 ◽  
Vol 45 (7) ◽  
pp. 1395 ◽  
Author(s):  
AM Bwye ◽  
RAC Jones ◽  
W Proudlove
Keyword(s):  
Cucumber Mosaic Virus ◽  
Mosaic Virus ◽  
Field Experiments ◽  
Plant Density ◽  
Lupinus Angustifolius ◽  
Virus Spread ◽  
Current Season ◽  
Infected Seed ◽  
High Plant Density ◽  
Sowing Seed

During 1990-92, narrow-leafed lupins (Lupinus angustifolius) cv. Gungurru, were grown in six field experiments in which plots were sown with healthy seed or seed that carried 0.5-5% infection with cucumber mosaic virus (CMV). Seed-infected plants were the primary source for subsequent virus spread by aphids. The rate of CMV spread and the extent of infection in plots depended on the level of infection in the seed sown, the proportion of infected seeds that successfully developed into established plants and the time of arrival and number of aphid vectors. In general, higher seed infection levels, better establishment of seed-infected plants and early aphid arrival favoured greater virus spread, yield loss and infection in the harvested seed. In 1991, in two experiments, late arrival of aphids resulted in minimal CMV spread, no effect on yield and much less infection in the harvested seed than in the seed sown. In the other four experiments, significant yield losses (25-42%) always resulted when seed with 5% or 3% infection was sown. Sowing 1% infected seed resulted in significantly decreased yields in two experiments, while 0.75% and 0.5% infected seed caused significant losses in one experiment (16-19% losses). Yield decreases were due to both fewer seeds being formed and decreased seed size. Levels of infection in harvested seed did not exceed 15%. In a further field experiment in 1991, individual plants that developed CMV symptoms before initiation of flowering or during flowering had significantly smaller yields than those that developed symptoms after flowering had finished. In four field experiments during 1990-91, 10-15% CMV-infected lupin seed was sown at rates of 20-150 kg ha-1 to generate a range of plant densities. The numbers of seed-infected plants were recorded at different times. The extent of loss of seed-infected plants due to shading by neighbouring healthy plants depended on plant density and the time when canopy closure developed. Where no canopy formed there was little or no loss of seed-infected plants, while early canopy formation at high plant density was most effective in removing them. Current-season spread was also decreased by early canopy formation and high plant density, but this effect was smaller when aphids arrived early. This work supports recommendations for management of CMV infection in lupins by sowing seed with low infection (<0.5%) to minimize infection sources, and sowing early at high seeding rates to remove seed-infected plants through improved canopy formation.

Effects of applying insecticides to control aphid vectors and cucumber mosaic virus in narrow-leafed lupins Lupinus angustifolius)

1997 ◽  
Vol 37 (1) ◽  
pp. 93 ◽  
Author(s):  
A. M. Bwye ◽  
W. Proudlove ◽  
F. A. Berlandier ◽  
R. A. C. Jones
Keyword(s):  
Grain Yield ◽  
Cucumber Mosaic Virus ◽  
Mosaic Virus ◽  
Field Experiments ◽  
Virus Transmission ◽  
Primary Source ◽  
Lupinus Angustifolius ◽  
Current Season ◽  
Infected Seed ◽  
Carbamate Insecticides

Summary. Narrow-leafed lupins (Lupinus angustifolius) were sown in 4 field experiments to investigate the effects of applying organophosphorus and carbamate insecticides on the spread of cucumber mosaic virus (CMV), which is transmitted non-persistently by aphids. The seed sown carried 0 or 5% CMV infection and seed-infected plants were the primary source for subsequent virus transmission by aphids. Virus incidence was gauged by calculating the percentage of plants per plot showing typical current-season CMV symptoms. At final assessment in plots sown with 5% infected seed, recorded CMV incidence was always significantly smaller (up to 3-fold less) when they received sprays of pirimicarb and/or methamidophos every 2 weeks than when they received no insecticide. When single or double strategic sprays of methamidophos or a mixture of pirimicarb/thiometon were applied in late August or early September, they either decreased recorded CMV incidence (up to 2-fold less infection) or had no significant effect on it. Recorded CMV incidence was not significantly diminished by dressing seed with disulfoton or by single- or double-foliar applications of pirimicarb used alone. However, pirimicarb sprays applied every 2 weeks improved grain yield (24% increase), as also did single or double applications of pirimicarb (14%). In one experiment, applications of methamidophos every 2 weeks to plots originally sown with 5% infected seed resulted in increased grain yield (35%) and yields were increased in plots sown with healthy seed whether sprayed every 2 weeks with methamidophos or left unsprayed (42–61%). Pirimicarb suppressed numbers of colonising Acyrthosiphon kondoi and Aphis craccivora to a greater extent than those of Myzus persicae, especially when sprayed every 2 weeks. Single-, double- and sprays of methamidophos every 2 weeks also decreased numbers of Acyrthosiphon kondoi, but had less effect on M. persicae. When different insecticides were tested for their abilities to kill colonising, insecticide-resistant M. persicae, methamidophos was the most effective. This work suggests that single or double strategic foliar sprays of organophosphorus or carbamate insecticides cannot be relied on to control CMV adequately to be recommended for use in increasing grain yields in CMV-infected lupin grain crops.

Interference of Three Annual Grasses with Grain Sorghum (Sorghum bicolor)

1990 ◽  
Vol 4 (2) ◽  
pp. 245-249 ◽  
Author(s):  
Brenda S. Smith ◽  
Don S. Murray ◽  
J. D. Green ◽  
Wan M. Wanyahaya ◽  
David L. Weeks
Keyword(s):  
Linear Regression ◽  
Grain Yield ◽  
Field Experiments ◽  
Grain Sorghum ◽  
Grass Species ◽  
Row Spacing ◽  
Yield Data ◽  
Weed Density ◽  
Annual Grasses ◽  
Wide Row Spacing

Barnyardgrass, large crabgrass, and Texas panicum were evaluated in field experiments over 3 yr to measure their duration of interference and density on grain sorghum yield. When grain yield data were converted to a percentage of the weed-free control, linear regression predicted a 3.6% yield loss for each week of weed interference regardless of year or grass species. Grain sorghum grown in a narrow (61-cm) row spacing was affected little by full-season interference; however, in wide (91-cm) rows, interference increased as grass density increased. Data from the wide-row spacing were described by linear regression following conversion of grain yield to percentages and weed density to log10. A separate nonlinear model also was derived which could predict the effect of weed density on grain sorghum yield.

Predictors of yield of Lupinus angustifolius (cv. Gungurru) seedlots from different sources in Western Australia

1995 ◽  
Vol 35 (6) ◽  
pp. 745
Author(s):  
HL Tapscott ◽  
WA Cowling
Keyword(s):  
Grain Yield ◽  
Cucumber Mosaic Virus ◽  
Mosaic Virus ◽  
Seed Size ◽  
Western Australia ◽  
Dry Weight ◽  
Germination Percentage ◽  
Lupinus Angustifolius ◽  
Shoot Dry Weight ◽  
Geographical Source

The growth and yield of 97 seedlots of Gungurm narrow-leafed lupins (Lupinus angustifolius L.) from Western Australia were assessed to identify geographical source or nutritional and physical parameters in the seed that can be used to predict the yield potential of a seedlot. Seedlots were obtained from the 1990 harvest on farms in the south-western cropping region of Western Australia, with up to 7 seedlots from each of 14 crop variety recommendation areas. Each seed lot was assessed for seed size (mean 144 mg), germination percentage (mean 87%), cucumber mosaic virus seed infection (mean 0.11%), and several seed nutrients. Seedlots were sown at 100 kg/ha (without adjusting for germination or seed size) at 4 sites in Western Australia in 1991. Plant density, shoot dry weight (at 6 weeks), and grain yield varied significantly among seedlots, with average grain yield ranging from 951 to 1478 kg/ha (l.s.d. = 240 kg/ha at P = 0.05). Seed size influenced (P<0.001) stand density (r = -0.33) and shoot dry weight (r = 0.58) but not grain yield (r = 0.09, n.s.). No seed nutrient was more than weakly associated with grain yield, nor was there an association of seedlot yield with geographical source of seed. High germination percentage and low cucumber mosaic virus infection were the main predictors of high grain yield in this experiment, but accounted for only 40% of the yield variance among seedlots.

Integrated Wild Oat (Avena fatua) Management Affects Spring Barley (Hordeum vulgare) Yield and Economics

1992 ◽  
Vol 6 (1) ◽  
pp. 129-135 ◽  
Author(s):  
David L. Barton ◽  
Donald C. Thill ◽  
Bahman Shafii
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Control Strategies ◽  
Integrated Control ◽  
Spring Barley ◽  
Barley Grain ◽  
Row Spacing ◽  
Wild Oat ◽  
Seeding Rate ◽  
Net Return

The effect of barley seeding rate and row spacing, and triallate, diclofop, and difenzoquat herbicide rate on barley grain yield and quality, and wild oat control were evaluated in field experiments near Bonners Ferry, Idaho, in 1989 and 1990. The purpose of the study was to develop integrated control strategies for wild oat in spring barley. Barley row spacing (9 and 18 cm) did not affect barley grain yield. Barley grain yield was greatest when barley was seeded at 134 or 201 kg ha–1compared to 67 kg ha–1. Wild oat control increased as wild oat herbicide rate increased and barley grain yield was greatest when wild oat herbicides were applied. However, barley grain yield was similar when wild oat biomass was reduced by either 65 or 85% by applications of half and full herbicide rates, respectively. Net return was greatest when the half rate of herbicide was applied to 100 wild oat plants per m2and was greatest when half or full herbicide rates were applied to 290 wild oat plants per m2. Net return increased when the seeding rate was increased to 134 or 201 kg ha–1when no herbicide was applied and when 290 wild oat plants per m2were present.

Lupin grain yields and fertiliser effectiveness are increased by banding superphosphate below the seed

1991 ◽  
Vol 31 (3) ◽  
pp. 357 ◽  
Author(s):  
RJ Jarvis ◽  
MDA Bolland
Keyword(s):  
Grain Yield ◽  
Vegetative Growth ◽  
Field Experiments ◽  
Soil Surface ◽  
Growing Season ◽  
Lupinus Angustifolius ◽  
Grain Yields ◽  
P Content ◽  
Better Than

Five field experiments with lupins (Lupinus angustifolius) measured the effectiveness, for production, of 4 superphosphate placements either: (i) drilled with the seed to a depth of 4 or 5 cm; (ii) applied to the soil surface (topdressed) before sowing; or (iii) banded 2.5-5 cm and 7.5-8 cm below the seed while sowing. Levels of applied phosphate (P) from 0 to 36 kg P/ha were tested. In all experiments lupin grain yield responded to the highest level of superphosphate applied. At this P level, the average grain yield from all trials was 1.16 t/ha for the deepest banded treatment. This was 0.38 t/ha (49%) better than P drilled with the seed, and 0.62 t/ha (115%) better than P topdressed. Relative to superphosphate drilled with the seed and regardless of the lupin cultivar or the phosphate status of the soil, the effectiveness of superphosphate was increased by 10-90% by banding below the seed, and decreased by 30-60% by topdressing. Increasing the levels of superphosphate drilled with the seed generally reduced the density of seedlings and reduced early vegetative growth, probably due to salt or P toxicity. However, during the growing season, the plants treated with high levels of superphosphate recovered, so that eventually yields of dried tops and grain responded to increasing superphosphate drilled with the seed. In each experiment there was a common relationship between yield and P content in lupin tissue, regardless of how the superphosphate was applied, suggesting that lupins responded solely to P, and other factors did not alter yield. We recommend that farmers band superphosphate 5-8 cm below the seed while sowing, rather than continue the present practices of either drilling the fertiliser with the seed, or topdressing it before sowing.

Some factors influencing the development of sunflower (Helianthus annuus L.) under dry-farming systems in Sudan

1981 ◽  
Vol 97 (1) ◽  
pp. 45-53 ◽  
Author(s):  
F. M. Khalifa
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Cultural Practices ◽  
Farming Systems ◽  
Sowing Date ◽  
The Other ◽  
Row Spacing ◽  
Sowing Dates ◽  
Supplementary Irrigation ◽  
Rainfed Conditions

SUMMARYAn experiment was carried out over a 3-year period at two locations in the central rainlands of Sudan under rainfed conditions at one site and under supplementary irrigation at the other to study the effects of cultivars and cultural practices on growth and grain yield of sunflower. Four cultivars, namely, Manohurian, Peredovik, Hungarian-A and Hungarian-B and four intra-row spacings of 15, 30, 45 and 60 cm (in rows 60 cm apart) were tested with three sowing dates starting on 15 July and following at 15-day intervals. Manchurian outyielded the other three varieties under supplementary irrigation whereas under rainfed conditions the reverse was true. This was attributed to the relative earliness in flowering of the varieties and their moisture requirements. Manchurian was the tallest with the thickest stem and a larger head at both locations compared with the other three varieties. Under rainfed conditions, the early sowing date of 15 July gave a significantly higher grain yield than the other two sowing dates, with the last sowing date of 15 August giving significantly least. This is attributed to decreasing moisture availability with delayed sowings. But under supplementary irrigation the effect of sowing date was less marked. Contrasting effects of sowing dates on plant height and stem circumference were obtained under the two systems of production. Under rainfed conditions there was a decrease in plant height and stem circumference with delayed sowing, whereas under supplementary irrigation the reverse was true. A contrasting response of plant height to spacing was also obtained; wider intra-row spacing was associated with taller plants under rainfed conditions and shorter plants under supplementary irrigation. Wider spacing was associated with thicker stems and larger heads at both locations. On the evidence obtained, 45 cm intra-row spacing is recommended for rainfed planting and 30 cm intra-row spacing for irrigated production of sunflower.

scholarly journals AGRONOMIC PERFORMANCE OF GRAIN SORGHUM CULTIVATED IN DOUBLE ROWS SPACE ON BRAZILIAN CERRADO

2020 ◽  
Vol 33 (2) ◽  
pp. 422-432
Author(s):  
EDUARDO LIMA DO CARMO ◽  
JOÃO VITOR ALVES DE SOUSA ◽  
CAMILA JORGE BERNABÉ FERREIRA ◽  
GUILHERME BRAGA PEREIRA BRAZ ◽  
GUSTAVO ANDRÉ SIMON
Keyword(s):  
Grain Yield ◽  
Water Distribution ◽  
Field Experiments ◽  
Block Design ◽  
Morphological Characteristics ◽  
Cost Benefit ◽  
Row Spacing ◽  
Agronomic Performance ◽  
Brazilian Cerrado ◽  
Double Row

ABSTRACT The spatial arrangement of plants in the cultivation area is a factor that directly influences grain yield, since the best arrangement can result in the greater use of water, light and nutrients. The aim of the study was to evaluate the agronomic performance of sorghum sown in double row spacing in the Brazilian Cerrado. For this purpose, field experiments were conducted in the 2018 and 2019 seasons in a complete block design with a factorial scheme of 2 x 5. There were four replications, using two row spacing: traditional (0.50 m) and double rows (0.25 m/0.75 m) and five plant populations: 120, 180 (recommended), 240, 300 and 360 thousand, plants ha-1. Morphological characteristics, yield components and grain yield were evaluated using joint data analysis for the two years of study. In 2018, due to lower rainfall during the crop season, the use of a double row arrangement presented grain yield lower than traditional spacing. On the other hand, in 2019, the year with the best water distribution, the yield was superior to that of 2018. The increase in plant population per hectare increased the yield of sorghum grains, with gains of up to 24% in relation to the recommended population of 180 thousand plants ha-1, demonstrated that the densification in this crop can be a promising technique as long as its cost/benefit is considered.

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