Effects of sharp eyespot on yield of wheat (<i>Triticum aestivum</i>) in New Zealand

Cromey, M. G.; Butler, Ruth; Boddington, H. J.; Moorhead, Andrea

doi:10.1080/01140671.2002.9514194

Cited by 33 publications

(32 citation statements)

References 7 publications

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“…The relatively severe disease in 2007 was associated with the relatively warm and wet autumn and winter followed by warmer and wet spring and colder and wet summer. Warmer winters and moist springs, which favour infection and colonization by R. cerealis, usually increase incidence and severity of disease (Clarkson and Cook 1983;Wiese 1987;Polley and Thomas 1991;Colbach et al 1997;Cromey et al 2002). Regional differences in incidence of sharp eyespot, which occurs most often in cooler regions, were also reported from the United Kingdom (Polley and Thomas 1991) and Canada (Hall and Sutton 1998).…”

Section: Discussionmentioning

confidence: 94%

“…Severe infections in England and Wales reduced yields by an average of 26 % (Clarkson and Cook 1983), and in East Scotland by an average of 10-12 % (Pitt 1966). In New Zealand, yield loss was considered to be negligible when the incidence was <10 %, and maximum individual yield loss was estimated at 18 % (Cromey et al 2002). Richardson et al (1976) observed, however, that average reductions of 8 % in tiller yield caused a 75 % reduction in grain number and 25 % reduction in grain weight.…”

Section: Discussionmentioning

confidence: 99%

“…Variation in disease was not expected to have resulted from soil type, which was similar in all sites, being dry, light, non-compacted sandy or silty loam rather poor in organic matter. Such soil generally favours survival and colonization by R. cerealis (Herman 1992;Cromey et al 2002). An effect of increasing severity category on lower plant dry weight may suggest an involvement of soil moisture not only in disease incidence but also in plant development.…”

Section: Discussionmentioning

confidence: 99%

“…Exceptionally, shoots may be killed as the ear emerges from the sheath (Clarkson and Cook 1983;Cromey et al 2002). The disease is favoured by neutral to slightly acid, dry and sandy soils (Pitt 1964).…”

Section: Introductionmentioning

confidence: 99%

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Effects of sharp eyespot (Rhizoctonia cerealis) on yield and grain quality of winter wheat

Lemańczyk

Kwaśna

2012

Eur J Plant Pathol

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Sharp eyespot caused by Rhizoctonia cerealis was assessed in four winter wheat crops surveyed at four locations in north-central Poland in [2006][2007][2008][2009]. At the four locations symptoms developed on 41.9-67.7 % of shoots of all plants (average of 4 years) and on 49-73.5 % of shoots of diseased plants (average of 4 years). Slight (category 1) disease was most frequent, occurring on 24.4-41.3 % of shoots (range 14.8-51.3 %); moderate (category 2) disease was less frequent, occurring on 16.9-25.5 % of shoots (range 8.9-32.4 %); severe (category 3) disease was least frequent, occurring on 3.2-7.1 % (range 0-22.0 %) of shoots. Sharp eyespot affected wheat growth and yield, and grain quality. Disease, especially in the severe category, was associated with significant decreases in plant and ear dry weights, number of grains per ear, grain dry weight per ear and thousand-grain weight, and with increases in grain protein and wet gluten contents, Hagberg falling number and sedimentation value. There was an association between occurrence of sharp eyespot in stems and colonization of grain by fungi. Alternaria alternata and E. nigrum were the most common species.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of sharp eyespot (Rhizoctonia cerealis) on yield and grain quality of winter wheat

Lemańczyk

Kwaśna

2012

Eur J Plant Pathol

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“…A greater intensity of sharp eyespot was also earlier observed in other countries (Pitt 1966;Clarkson and Cook 1983;Cromey et al 2002;Chen et al 2010). The increased spreading of this disease, despite continuing to grow the cereals (Colbach et al 1997;Żółtańska 2005), can also be a consequence of more favourable weather conditions, earlier sowing and the application of fungicides as plant protection against eyespot (Prew and McIntosh 1975;van der Hoeven and Bollen 1980;Bockus et al 2010).…”

Section: Introductionmentioning

confidence: 74%

The Role of the Preceding Crop and Weed Control in the Transmission of Rhizoctonia Cerealis and R. Solani to Winter Cereals

Lemańczyk¹

2012

Journal of Plant Protection Research

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Abstract:Winter cereals (wheat, triticale, rye, barley) grown in experimental fields were assessed for sharp eyespot. Preceding crops (spring cereals and fallow) and weed control (herbicides application, no control) were taken into account. The health status evaluation was carried out at the stem elongation phase and at the milk maturity stage. The macroscopic estimation was accompanied by the analysis of fungal species identified on stem bases and roots, which showed various disease symptoms. The analysis of fungal species from the genus Rhizoctonia were especially noted. Mycological analysis of roots was carried out at the seedling growth and stem elongation phase, and stem bases at the seedling growth and milk maturity stage. Infection caused by Rhizoctonia spp. was confirmed by polymeraze chain reaction (PCR) assay. The highest infection was noted on wheat followed by triticale, rye and barley.Occurrence of sharp eyespot depended more on weed control than on what the preceding crop had been. At the milk maturity stage, lower severity of sharp eyespot of triticale, rye and barley was noted on plots not treated with herbicides, and on wheat with herbicide application. The research showed a significant effect of the preceding crop only on the health status of wheat. At the milk maturity stage, the highest infection was noted after spring triticale and the lowest after oats. Stems of cereals with sharp eyespot symptoms and healthy stems were settled mainly by Rhizoctonia cerealis (wheat -25.6%, triticale -12.0%, rye -22.2%, barley -11.3%), rarely by R. solani (respectively 6.0, 4.0, 2.9 and 1.8%). Rhizoctonia solani was isolated more often from roots with true eyespot and Fusarium foot rot symptoms. It may suggest that R. cerealis was the main causal agent of sharp eyespot on all tested cereals. The preceding crop did not affect the composition of Rhizoctonia species.

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The escalating threat of Rhizoctonia cerealis, the causal agent of sharp eyespot in wheat

Hamada

Yin

Chen

et al. 2011

Pest Management Science

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Rhizoctonia cerealis, the causal agent of sharp eyespot on wheat, was not considered to be an important pathogen for many years. Recently, the disease has become endemic in many countries except for South America. The disease has created a new threat to world wheat production because the damage of wheat sharp eyespot has become increasingly severe. In this paper, previous studies on this pathogen, including the disease geographical distribution, pathogen identification, life cycle, symptoms, favourable environmental conditions, effects on wheat yield and control strategy, are reviewed. Such information will be helpful in management of sharp eyespot.

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Effects of sharp eyespot on yield of wheat (Triticum aestivum) in New Zealand

Cited by 33 publications

References 7 publications

Effects of sharp eyespot (Rhizoctonia cerealis) on yield and grain quality of winter wheat

Effects of sharp eyespot (Rhizoctonia cerealis) on yield and grain quality of winter wheat

The Role of the Preceding Crop and Weed Control in the Transmission of Rhizoctonia Cerealis and R. Solani to Winter Cereals

The escalating threat of Rhizoctonia cerealis, the causal agent of sharp eyespot in wheat

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