Effects of fungicides on eyespot in five successive crops of winter wheat in plots with different initial or fungicide-selected populations of Pseudocercosporella herpotrichoides

Bateman, G. L.; Fitt, Bruce D.L.

doi:10.1016/s0261-2194(91)80137-5

Cited by 10 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Take-all caused by Gaeumannomyces graminis var. tritici had been prevalent in the third cereal in 1985 (Bateman & Fitt, 1991) but had since declined as expected. However, it again became severe in patches in the ninth cereal in 1991 and was assessed in this year as slight, moderate or severe to produce a take-all rating per plot on a 0-300 scale (Dyke & Slope, 1978).…”

Section: Disease Assessmentsmentioning

confidence: 54%

Development of disease symptoms and fungal pathogens on shoot bases in continuous winter wheat, and effects of fungicides

Bateman

1993

Plant Pathology

View full text Add to dashboard Cite

Field plots in three consecutive crops of winter wheat were sampled at approximately 2‐week intervals from April to July in 1989, 1990 and 1991. Culm and stem bases were examined for symptoms of eyespot, sharp eyespot and brown foot rot. The W‐type and R‐type of Pseudocercosporella herpotrichoides, P. anguioides, Fusarium culmorum, F. avenaceum and Microdochium nivale grown from this plant material on agar were identified. Eyespot was most severe in 1991, when plant development was least rapid following cool weather in late winter and the summer was relatively cool and wet. Sharp eyespot was most severe in 1990, which had a warm summer with moderate rainfall. The other warm summer, 1989, was drier and these conditions favoured late development of brown foot rot, associated mainly with F. culmorum which was scarce at other times. Sharp eyespot sometimes increased where prochloraz, which decreased eyespot, was applied. Distinct symptoms of more than one disease occurred less frequently on the same stem than expected from the individual total occurrences, but co‐occurrences of different fungi were often more frequent than expected. In July 1990, Fusarium spp. co‐occurred with R‐type, but not W‐type, P. herpotrichoides more frequently than expected, and in July 1990 and 1991 M. nivale and both W‐type and R‐type co‐occurred more frequently than expected. Fusarium spp. and M. nivale were more frequent, especially in the earlier samples, on nodes than on internodes, whilst P. herpotrichoides normally infected at the internodes. The results suggest that stems weakened or altered by a primary colonizer are often a suitable substrate for a secondary colonizer, often a Fusarium sp., which may begin infection at a distance from the original lesion and often not cause distinct symptoms itself.

show abstract

Section: Disease Assessmentsmentioning

confidence: 54%

Development of disease symptoms and fungal pathogens on shoot bases in continuous winter wheat, and effects of fungicides

Bateman

1993

Plant Pathology

View full text Add to dashboard Cite

show abstract

“…Ratios of 1:1 were not found at some field sites, but this may have been due to ascospores originating from more than one cross. The presence of MBC-sensitive isolates supports the continued use of mixtures of carbendazim and prochloraz fungicides for the treatment of eyespot, which can prove more effective than the use of prochloraz alone (Bateman & Fitt, 1991;Bateman, 1994),…”

Section: Discussionmentioning

confidence: 93%

Incidence of apothecia of Tapesia yallundae at setaside sites in England and sensitivity of the ascospore offspring to the fungicides benomyl and prochloraz

Dyer

Lucas

1995

Plant Pathology

View full text Add to dashboard Cite

A total of 45 field sites in England were surveyed once for the presence of apothecia of Tapesia yallundae from 1992 to 1994. Apothecia were found at 21 locations and were mainly present on less than 3% of stems. However, apothecia were found on 1532% of stems at four sites. Analysis of the growth characteristics of ascospore isolates from seven sites showed that most produced colonies characteristic of the W‐type of T. yallundae, with only one site yielding the R‐type, Most ascospore isolates were resistant to the fungicide benomyl and effectively all remained sensitive to prochloraz. The results of the study are discussed in relation to the fungicidal control and epidemiology of T. yallundae, and the risk of spread of disease from set‐aside sites.

show abstract

“…The previous wheat crop was harvested on 16 August 1993; the straw was then removed and the site left uncultivated. The experiment on the site, described previously Bateman and Fitt, 1991] had two blocks of a split-plot design, with four whole-plots per block. The whole-plots were untreated or had been treated twice yearly with carbendazim (as Bavistin), prochloraz (as Sportak) or carbendazim plus prochloraz (as Sportak Alpha or Sportak plus Bavistin) in each of the preceding nine years, when winter wheat was grown.…”

Section: Methodsmentioning

confidence: 99%

Development of apothecia ofTapesia yallundae in contrasting populations selected by fungicides

1995

View full text Add to dashboard Cite

Apothecia of the eyespot fungus, Tapesia yallundae, were found on 0--18% of straws in plots of wheat stubble in February-March 1994. The fungicides carbendazim, prochloraz or carbendazim plus prochloraz had been applied repeatedly to the same plots in each of the previous 9 years in which successive wheat crops had been grown. The factors most strongly correlated with the incidence of apothecia were the incidence and severity of eyespot in the preceding wheat crop and the frequency of carbendazim-resistant W-type fungus in populations recovered from that wheat crop. Plots treated with carbendazim, which had previously had more disease and more resistance to carbendazim in the pathogen population relative to untreated plots, therefore yielded most apothecia. Plots treated with prochloraz, which had selected for predominantly R-type fungus and decreased eyespot, yielded few apothecia. Single-ascospore isolates were all of the W-type and were more frequently carbendazim-sensitive than expected, except those from plots treated only with carbendazim. None showed decreased sensitivity to prochloraz. The implications of applying fungicides regularly for controlling eyespot on the capability of the eyespot fungus for genetic variation through sexual reproduction are discussed.

show abstract

Effects of fungicides on eyespot in five successive crops of winter wheat in plots with different initial or fungicide-selected populations of Pseudocercosporella herpotrichoides

Cited by 10 publications

References 14 publications

Development of disease symptoms and fungal pathogens on shoot bases in continuous winter wheat, and effects of fungicides

Development of disease symptoms and fungal pathogens on shoot bases in continuous winter wheat, and effects of fungicides

Incidence of apothecia of Tapesia yallundae at setaside sites in England and sensitivity of the ascospore offspring to the fungicides benomyl and prochloraz

Development of apothecia ofTapesia yallundae in contrasting populations selected by fungicides

Contact Info

Product

Resources

About