Relation Between Incidence of Gaeumannomyces Graminis Var. Tritlci and Grain Yield

Nish, GC Mac; Dodman, RL

doi:10.1071/bi9731289

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Attempts have been made to quantify the losses resulting from different amounts of take‐all using surveys4, 5 and field experiments 6. 7 A drawback to such approaches is that differences in take‐all symptoms were often a result of treatments that also had a direct effect on yield (eg amount of nitrogen fertiliser, sowing date). Some experiments have been devised to avoid such confounding factors by applying the same amounts of inoculum artificially, but at different depths, whilst using the same cultivations3 or by treating seed with the fungicide silthiofam, which is selective against take‐all 8.…”

Section: Introductionmentioning

confidence: 99%

Variation in the effects of take‐all disease on grain yield and quality of winter cereals in field experiments

Gutteridge

Bateman

Todd

2003

Pest Management Science

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Relationships between take-all intensity and grain yield and quality were determined in field experiments on cereal crops using regression analyses, usually based on single-point disease assessments made during anthesis or grain-filling. Different amounts of take-all were achieved by different methods of applying inoculum artificially (to wheat only) or by using different cropping sequences (in wheat, triticale or barley) or sowing dates (wheat only) in crops with natural inoculum. Regressions of yield or thousand-grain weight on take-all intensity during grain filling were similar to those on accumulated disease (area under the disease progress curve) when these were compared in one of the wheat experiments. Regressions of yield on take-all intensity were more often significant in wheat than in the less susceptible crops, triticale and barley, even when a wide range of disease intensities was present in the latter crops. The regressions usually had most significance when there were plots in the severe disease category. Thousand-grain weight and hectolitre weight usually responded similarly to total grain yield. Decreased yield was often accompanied by a significant increase in the percentage of small grains. When severe take-all was present in wheat, regressions showed that nitrogen uptake was usually impaired. This was sometimes accompanied, however, by increased percentage nitrogen in the grain as a consequence of smaller grain size with decreased endosperm. Significant effects of take-all, both positive and negative, on Hagberg falling number in wheat sometimes occurred. Significant regressions of yield on take-all assessed earlier than usual, ie during booting rather than grain-filling in wheat and triticale and during anthesis/grain-filling rather than ripening in barley, had steeper slopes. This is consistent with observations that severe disease that develops early can be particularly damaging, whilst the crops, especially barley, can later express tolerance by producing additional, healthy roots. The regression parameters, including maximum potential yield (y-axis intercept) and the extrapolated maximum yield loss, also varied according to the different growing conditions, including experimental treatments and other husbandry operations. These differences must be considered when assessing the economic potential of a control measure such as fungicidal seed treatment.

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Section: Introductionmentioning

confidence: 99%

Variation in the effects of take‐all disease on grain yield and quality of winter cereals in field experiments

Gutteridge

Bateman

Todd

2003

Pest Management Science

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“…If the regression established at the same location and reported previously (Mac Nish and Dodman 1973) is applied to these results, the estimated incidence of G. graminis can be superimposed on the grain yield map to give the incidence-yield map shown in Figure l(a).…”

Section: (A) Turretfield Locationmentioning

confidence: 99%

“…The incidence-yield regression for 1970 is shown in Figure 2. As previously described (Mac Nish and Dodman 1973), the portion below the line on the y axis was divided into three equal parts; thus the delimiting points for the 1970 season were 27% and below for the low-incidence category and 54 % and above for the high-incidence category. From these values it can be calculated (using the regression) that high-incidence areas have a yield of 23 g or less per site while intermediate areas have a yield of 24-48 g per site.…”

Section: (A) Turretfield Locationmentioning

confidence: 99%

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Incidence of Gaeumannomyces Graminis Var. Tritici in Consecutive Wheat Crops

Nish¹,

Dodman²

1973

Aust. Jnl. Of Bio. Sci.

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A mapping technique based on an "incidence-yield" regression was used to study the incidence of G. graminis var. tritici in consecutive wheat crops at two locations in South Australia. At both locations there were only small differences between the two years, although at Turretfield (third and fourth crops) there was a tendency for highincidence areas to contract, while at Ceduna (second and third crops) disease incidence tended to increase.

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Diseases caused by soil-borne pathogens

Lucas¹

The Epidemiology of Plant Diseases

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Relation Between Incidence of Gaeumannomyces Graminis Var. Tritlci and Grain Yield

Cited by 7 publications

References 4 publications

Variation in the effects of take‐all disease on grain yield and quality of winter cereals in field experiments

Variation in the effects of take‐all disease on grain yield and quality of winter cereals in field experiments

Incidence of Gaeumannomyces Graminis Var. Tritici in Consecutive Wheat Crops

Diseases caused by soil-borne pathogens

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