Effect of rotation with barley and oats on crown rot of wheat in the northern wheat belt of New South Wales

1995 ◽  
Vol 35 (6) ◽  
pp. 765 ◽  
Author(s):  
KE Nelson ◽  
LW Burgess
Keyword(s):  
Fusarium Graminearum ◽  
New South ◽  
Crown Rot ◽  
Similar Amount ◽  
Wheat Seed ◽  
Previous Crop ◽  
South Wales ◽  
Oat Straw ◽  
Fusarium Graminearum Group 1 ◽  
Group 1

We investigated the incidence of Fusarium graminearum Group 1 (infection, stem colonisation) and crown rot in 3-year crop sequences of 1 or 2 years of barley, oats, or mown oats followed by wheat, compared with 3 years of wheat. Seed was sown into the stubble of the previous crop. Stubble production was estimated for each cereal treatment. Plants of each cereal were infected by the crown rot pathogen. Oats were susceptible to infection but did not express symptoms of crown rot in 2 years of the trial. Oats can, therefore, be considered a symptomless host that may contribute to the maintenance of inoculum. The overall mean incidence of infected plants increased from 12% in 1987 to 81% in 1989. The various treatments did not significantly reduce the incidence of infected wheat plants in November of the final year. The incidence of crown rot of wheat in 1989 was greatest after 2 prior wheat crops and lowest after 1 or 2 years of mown oats. The 3 species produced a similar amount of straw by weight; however, mown oats produced significantly less. Oat straw decomposed more rapidly than that of other cereals in controlled conditions.

The incidence and spatial patterns of wheat plants infected by Fusarium graminearum group 1 and the effect of crown rot on yield

1991 ◽  
Vol 42 (3) ◽  
pp. 399 ◽  
Author(s):  
TA Klein ◽  
LW Burgess ◽  
FW Ellison
Keyword(s):  
Fusarium Graminearum ◽  
Spatial Patterns ◽  
Positive Association ◽  
Crown Rot ◽  
Random Pattern ◽  
Potential Yield ◽  
South Wales ◽  
Bare Fallow ◽  
Fusarium Graminearum Group 1 ◽  
Group 1

The incidence and spatial patterns of wheat plants infected by Fusarium graminearum Group 1 were assessed in six fields in northern New South Wales, Australia, over a four-year period. The incidence of infected plants declined from 1978 to 1981 in fields where wheat was sown each year, where there was a bare fallow of 18 months and where sunflowers were sown in one season. The pattern of infected plants tended to be regular (uniform) where the incidence of infected plants was particularly high (> 96%). In all fields where a clustered (aggregated) pattern was detected, 12% to 64.4% of plants were infected. A random pattern was observed at a number of sites. There was a positive association between loss in potential yield and the incidence of infection, basal browning of plants and whiteheads. Losses of up to 89% were recorded.

The incidence of crown rot in wheat, barley and triticale when sown on two dates

1989 ◽  
Vol 29 (4) ◽  
pp. 559 ◽  
Author(s):  
TA Klein ◽  
LW Burgess ◽  
FW Ellison
Keyword(s):  
New South ◽  
Sowing Date ◽  
The Other ◽  
Crown Rot ◽  
Wheat Cultivars ◽  
Potential Yield ◽  
South Wales ◽  
The Mean ◽  
Fusarium Graminearum Group 1 ◽  
Group 1

Thirteen bread wheat cultivars, a durum wheat, a barley and a triticale cultivar were assessed in the field for their reaction to crown rot (Fusarium graminearum Group 1), based on the incidence of basal browning. Plots were sown in May and again in July at 2 sites i n northern New South Wales where the incidence of crown rot was high in the previous year. The incidence of infected plants and the incidence of plants with basal browning tended to be higher in all cultivars when sown in May. There was a mean loss in potential yield at 1 site of 35% and 18% at the other site. However, the mean loss in potential yield was unaffected by sowing date.

Survey of the incidence of whiteheads in wheat crops grown in northern New South Wales, 1976-1981

1990 ◽  
Vol 30 (5) ◽  
pp. 621 ◽  
Author(s):  
TA Klein ◽  
LW Burgess ◽  
FW Ellison
Keyword(s):  
New South ◽  
New South Wales ◽  
The Other ◽  
Crown Rot ◽  
South Wales ◽  
Northern Areas ◽  
High Incidence ◽  
The Mean ◽  
Fusarium Graminearum Group 1 ◽  
Group 1

The incidence of whiteheads in wheat in the northern areas of the wheat belt in New South Wales was surveyed from 1976 to 1981. Whiteheads were associated with plants affected by crown rot and were common in wheat crops in the survey areas, although the incidence was low (<5%) in most crops. There was a high incidence of whiteheads (>5%) in a small number of crops in each year. The mean incidence of whiteheads was highest in 1977 and was generally higher in the western, lower rainfall areas than in the other areas each year. The predominant crown rot pathogen Fusarium graminearum Group 1 was isolated from 97% of 1450 stem bases collected from plants with whitehead symptoms. A fallow of 18 months was not always associated with a reduction in the incidence of whiteheads.

Reaction of Australian cultivars of oats and barley to infection by Fusarium graminearum Group 1

1994 ◽  
Vol 34 (5) ◽  
pp. 655 ◽  
Author(s):  
KE Nelson ◽  
LW Burgess
Keyword(s):  
Fusarium Graminearum ◽  
Field Experiments ◽  
Field Trials ◽  
Crown Rot ◽  
Barley Cultivars ◽  
Fusarium Graminearum Group 1 ◽  
Group 1

The incidence of infection by Fusarium graminearum Group 1 and the incidence of crown rot were compared for various cultivars of oats, wheat and barley in glasshouse and field experiments. In glasshouse studies, the incidence of infected plants was lower in oats than in wheat or barley at 6 weeks after sowing. Crown rot symptoms were not observed in oats of any cultivar. The incidence and severity of crown rot in barley was similar to that in wheat cv. Banks. Between 17 and 29 genotypes of oats, wheat and barley were assessed in field trials over 3 years. Stem browning, a symptom of crown rot, was common in wheat and barley but was not observed in any cultivar of oats. Among plants of wheat and barley, the effect of cultivar on incidence of crown rot was significant (P = 0.05) in 3 of 4 trials. Results suggest that oats are a symptomless host. This should be considered when growing oats in rotation to reduce crown rot inoculum. The barley cultivars assessed all developed moderate-severe crown rot symptoms and thus may incur yield limitations where crown rot is prevalent.

Corrigendum - Inoculation methods for assessing resistance in wheat to crown rot caused by Fusarium graminearum group 1

1987 ◽  
Vol 38 (3) ◽  
pp. 473
Author(s):  
RL Dodman ◽  
GB Wildermuth
Keyword(s):  
Fusarium Graminearum ◽  
Aqueous Suspension ◽  
Crown Rot ◽  
Natural Field ◽  
High Incidence ◽  
Induced Field ◽  
Sowing Seed ◽  
Fusarium Graminearum Group 1 ◽  
Field Inoculum ◽  
Group 1

A range of inocululatron methods for assessing resistance in wheat to crown rot caused by Fusarium graminearum Group 1 was evaluated in the glasshouse and in the field. When grain was colonized with the pathogen, ground and applied with the seed at planting or spread around young plants as an aqueous suspension, high levels of crown rot were produced, but resistance (usually measured as per cent diseased plants or tillers) was still expressed. Similar results were achieved with induced field inoculum obtained by inoculating an area of wheat to obtain a high incidence of disease and incorporating the stubble into the soil. Natural field inoculum and inoculation of seed with spores produced lower levels of disease, although differentiation of resistant and susceptible cultivars was still possible. Other methods, suitable only for plants in pots and often for more specific purposes (for example, for inoculation at different stages of plant growth) were also studied. Resistance was best expressed where inoculum was applied onto or into soil, rather than directly onto or into plants. Currently, the resistance of all potential cultivars for release in Queensland is assessed in the field by sowing seed dusted with benomyl into furrows along which ground, colonized grain is distributed. Crown rot severity is then determined at maturity.

Inoculation methods for assessing resistance in wheat to crown rot caused by Fusarium graminearum group 1

1987 ◽  
Vol 38 (3) ◽  
pp. 473 ◽  
Author(s):  
RL Dodman ◽  
GB Wildermuth
Keyword(s):  
Fusarium Graminearum ◽  
Aqueous Suspension ◽  
Crown Rot ◽  
Natural Field ◽  
High Incidence ◽  
Induced Field ◽  
Sowing Seed ◽  
Fusarium Graminearum Group 1 ◽  
Field Inoculum ◽  
Group 1

A range of inocululatron methods for assessing resistance in wheat to crown rot caused by Fusarium graminearum Group 1 was evaluated in the glasshouse and in the field. When grain was colonized with the pathogen, ground and applied with the seed at planting or spread around young plants as an aqueous suspension, high levels of crown rot were produced, but resistance (usually measured as per cent diseased plants or tillers) was still expressed. Similar results were achieved with induced field inoculum obtained by inoculating an area of wheat to obtain a high incidence of disease and incorporating the stubble into the soil. Natural field inoculum and inoculation of seed with spores produced lower levels of disease, although differentiation of resistant and susceptible cultivars was still possible. Other methods, suitable only for plants in pots and often for more specific purposes (for example, for inoculation at different stages of plant growth) were also studied. Resistance was best expressed where inoculum was applied onto or into soil, rather than directly onto or into plants. Currently, the resistance of all potential cultivars for release in Queensland is assessed in the field by sowing seed dusted with benomyl into furrows along which ground, colonized grain is distributed. Crown rot severity is then determined at maturity.

Long-term effects of stubble management on the incidence of infection of wheat by Fusarium graminearum Schw. Group 1

1993 ◽  
Vol 33 (4) ◽  
pp. 451 ◽  
Author(s):  
LW Burgess ◽  
D Backhouse ◽  
BA Summerell ◽  
AB Pattison ◽  
TA Klein ◽  
...  
Keyword(s):  
Fusarium Graminearum ◽  
New South ◽  
Wheat Crop ◽  
Long Term Effects ◽  
South Wales ◽  
Wheat Cultivation ◽  
Management Regimes ◽  
Weed Hosts ◽  
Group 1

The effect of 3 stubble management regimes (burning after harvest, incorporation with a disc plough, retention on the surface) on the incidence of infection of wheat with Fusarium graminearum Schw. Group 1 was studied for 5 seasons at 2 sites at Moree, New South Wales. One site had high initial incidence (site A) and the other low initial incidence (site B). There were no differences in incidence of infection between retained and incorporated treatments. Stubble burning reduced the increase in incidence of infection in 2 of 5 years at site A and 3 of 4 years at site B. Failure of control in other years was attributed to susceptible weed hosts and poor burns. When stubble was retained on the plots at site B that had been burnt, incidence of infection in the next season increased to a level not significantly different from the retained or incorporated treatments. Incidence of infection at the fourth consecutive wheat crop at both sites was close to the maximum recorded, which was 92% at site A and 65% at site B. There was no evidence of a decline in incidence by the time of the most recent season assessed (eighth year of continuous wheat cultivation at site A, and sixth year at site B). In most years, the differences in yield between treatments were not significant.

Effectiveness of fungicide seed treatments for preventing seed-to-seedling transmission of Fusarium graminearum under controlled-environment conditions

2009 ◽  
Vol 89 (4) ◽  
pp. 811-821 ◽  
Author(s):  
M R Fernandez ◽  
T K Turkington ◽  
W E May
Keyword(s):  
Fusarium Graminearum ◽  
Plant Tissue ◽  
Seedling Emergence ◽  
Wheat Root ◽  
Crown Rot ◽  
Controlled Environment ◽  
Wheat Seed ◽  
Seed Treatments ◽  
Head Blight ◽  
Infected Seed

Fusarium head blight (FHB) is well established in the eastern prairies, but for the most part it has been absent from western regions, especially under dryland conditions. This has been largely attributed to dry and hot conditions during some years, and the limited occurrence of F. graminearum in the western prairies. It is of importance to prevent the movement of F. graminearum, the most important FHB pathogen in North America, to areas where this pathogen is not commonly found. Three controlled-environment studies, using different Fusarium-infected common and durum wheat seed lots, were conducted to determine the effectiveness of currently registered fungicide seed treatments in improving seedling emergence and plant development, and preventing the growth of F. graminearum from infected seed to plant tissue. Fungicide treatments improved seedling emergence from the most infected seed over the untreated infected control, but most treatments did not improve emergence in the other experiments. Plant growth in the fungicide treatments was either similar to or slower than in the untreated controls. Fusarium graminearum was isolated from discoloured tissue in all treatments and was generally more common in crowns than in subcrown internodes. No fungicide treatment reduced discolouration of plant tissue or percentage isolation of F. graminearum or other Fusarium spp. consistently. We conclude that while currently registered seed treatments might be effective in improving seedling emergence in some infected wheat seed lots, they do not prevent the growth of F. graminearum from seeds to plant tissue. For the western prairies, the use of fungicide seed treatments as a strategy in the prevention of spread of FHB would require that they be effective primarily against F. graminearum. Performance of fungicide seed treatments against Fusarium-infected wheat seed should also be determined under typical growing conditions across the western prairies.Key words: Seed treatments, fungicides, wheat, root rot, crown rot, Fusarium graminearum, Fusarium avenaceum

Merino ewe and lamb performance in the Central Tablelands of New South Wales following joining in March-April or June-July

1988 ◽  
Vol 28 (5) ◽  
pp. 561 ◽  
Author(s):  
HL Davies ◽  
E Devaud
Keyword(s):  
New South ◽  
New South Wales ◽  
Subterranean Clover ◽  
Late Pregnancy ◽  
Stocking Rate ◽  
South Wales ◽  
Group Number ◽  
Nutritional Advantage ◽  
June July ◽  
Group 1

A March-April joining of Merino ewes was compared with a June-July joining in central New South Wales at a low stocking rate on subterranean clover based pastures over 3 years. In all years, ewes joined in June were heavier (P < 0.05) than ewes joined in March (55 v. 52 kg). Liveweights at the start of lambing and liveweight change from joining to lambing were also high and favoured the later lambing group. The proportion of ewes lambing (97% March v. 93% June) and proportion of ewes twinning (29% March v. 20% June) were not significantly different between the 2 groups, but consistently favoured the March-April joining. Perinatal mortality was low (9.4% March v. 7.1% June) and not significantly different between the 2 groups, but was consistently lower in the June joined group. Number of lambs weaned per 100 ewes joined was also not significantly different, but was higher each year in the March joined group (1 13% March v. 105% June). The growth rate of the lambs (both singles [24% greater, 248 v. 200 g/day] and twins [37% greater, 2 13 v. 155 g/day]) was consistently in favour of March joined ewes. Mean greasy fleece weights of the ewes were not significantly different between the 2 groups, but were in favour of the late joined group (4.83 v. 4.50 kg). Time of joining significantly affected liveweights and greasy and clean fleece weights of the progeny at the shearing in the year following their birth in favour of March joining. These data suggest that, despite a nutritional advantage to the ewes in late pregnancy and milder weather at lambing with a June-July joining, a March- April joining is the preferred option on the Central Tablelands of New South Wales.

Effect of gypsum on vertisols of the Gwydir Valley, New South Wales. 1. Soil properties and wheat growth

1989 ◽  
Vol 29 (1) ◽  
pp. 51 ◽  
Author(s):  
DC McKenzie ◽  
HB So
Keyword(s):  
Soil Properties ◽  
Soil Water ◽  
New South ◽  
New South Wales ◽  
Nitrogen Deficiency ◽  
Crop Productivity ◽  
Plant Response ◽  
Crown Rot ◽  
Soil Water Storage ◽  
South Wales

The effect of gypsum on the properties and crop productivity of 6 contrasting vertisols of the Gwydir Valley, New South Wales was investigated in 1978 and 1979. These soils are often used for dryland wheat production, although crop growth is generally restricted by their structural instability. In 2 of the soils used in our study, the surface aggregates were sodic and dispersive (poor soils), 2 were relatively stable when wetted (good soils), whilst the other 2 soils had surface aggregates that were intermediate in behaviour (intermediate soils). The effects of added gypsum at 4 rates (0, 2.5, 5.0 and 7.5 t ha-1) on soil water profiles, soil properties and the growth of wheat were monitored over a 2 year period. Dryland wheat grain yields were increased by as much as 230% following the application of gypsum. Benefits were most pronounced on clays with sodic topsoils, a high water-holding capacity and adequate nutrition; plant response to gypsum on nearby soils with non-dispersive surfaces was less pronounced. Yield increases were associated with better seedling establishment, greater tiller production, increased grain weight, and lower incidence of 'Crown Rot' disease. Plant response to gypsum was related to improved water penetration into the soil, allowing greater storage of water in the subsoil, rather than loss via evaporation and possibly runoff. Increases as high as 137% in the soil water storage to a depth of 1.2 m were observed. Crop performance was also strongly influenced by rainfall, time of sowing and weed control. Where nitrogen and, to a lesser extent, phosphorus, were deficient in gypsum-treated soil, they had to be added before the extra soil water could be utilised effectively by wheat. On the lighter textured clays, gypsum appeared to aggravate nitrogen deficiency, apparently because of enhanced leaching.

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