Effect of fungicide treatment on yield of winter wheat and spring barley cultivars

Priestley, R. H.; Bayles, R. A.

doi:10.1111/j.1365-3059.1982.tb02809.x

Cited by 23 publications

(18 citation statements)

References 12 publications

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“…Yield responses to fungicide, where they occurred, varied between 6-3 and 11-8 %, within a similar range to yield responses in spring barley reported elsewhere (Priestley & Bayles 1982;Tonkin & Silvey 1982). Yield responses were accounted for by variations in green leaf area at GS79 in those experiments where they occurred.…”

Section: Discussionsupporting

confidence: 67%

“…The relationship between yield response to fungicide and leaf area duration is well documented (James 1967;Priestley & Bayles 1982). In some cases, delayed leaf sensescence was not directly related to disease incidence, indicating some additional effect of fungicide other than disease control (Priestley & Bayles 1982;Wale & Hunter 1985). In the current work, disease incidence was not assessed directly, so any such effect could not be detected.…”

Section: Discussionmentioning

confidence: 90%

“…In two experiments, however, increased green leaf area in fungicide-treated plots did not result in a corresponding increase in yield, for reasons which were not apparent. The relationship between yield response to fungicide and leaf area duration is well documented (James 1967;Priestley & Bayles 1982). In some cases, delayed leaf sensescence was not directly related to disease incidence, indicating some additional effect of fungicide other than disease control (Priestley & Bayles 1982;Wale & Hunter 1985).…”

Section: Discussionmentioning

confidence: 98%

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Effects of herbicide use, fungicide use and position in the field on the yield and yield components of spring barley

Boatman

1992

J. Agric. Sci.

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S U M M A R YSix experiments were carried out over 2 years (1985 and 1986) in commercial spring barley crops on calcareous soils in Hampshire. Herbicides increased grain yield by 005-1-21 t/ha, and fungicides by 001-0-68 t/ha. Herbicide use affected each of the yield components ears/plant, grains/ear, 1000-grain weight and harvest index in one or more cases but the effects were not consistent between experiments or consistently related to yield increases. Fungicide use had little effect on yield components other than 1000-grain weight, which was significantly increased in all experiments. There were no significant herbicide x fungicide interactions. Large differences in yield were recorded between field edge (headland) and midfield plots, with headland plots outyielding the midfield in two of the three experiments where this effect was considered.The effects of fungicide use were accounted for by associated increases in the green lamina area of the flag leaf and second leaf at the late milk stage of grain development. This is consistent with previous work. Differences in yield response to herbicide between sites were linearly related both to weed numbers early in the season and to weed biomass at harvest. Weeds did not always directly replace crop biomass; in some experiments the combined dry matter production was greater when herbicide was not used. However, the results indicate that, where a diverse weed flora composed of species of moderate to low competitive ability is present, simple weed counts may provide a useful indication of potential yield loss.It is concluded that headland areas can often be as productive as the rest of the field, but a greater understanding of the factors involved is needed if this potential is to be realized.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 98%

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Effects of herbicide use, fungicide use and position in the field on the yield and yield components of spring barley

Boatman

1992

J. Agric. Sci.

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“…Delayed senescence of leaf tissue after fungicide application has also been reported in cereals (e.g., Priestley 1981;Priestley & Bayles 1982). However, the mechanism by which fungicides delay senescence is unclear.…”

Section: Introductionmentioning

confidence: 92%

Fungicidal effects on stem rust, green leaf area, and seed yield in ‘Grasslands Nui’ perennial ryegrass

Hampton

1986

New Zealand Journal of Experimental Agriculture

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Seed yield of Latium perenne L. cv. 'Grasslands Nui' was increased from 65 to 91 g m-2 after a single application at ear emergence ofa mixture of triadimefon + carbendazim + captafol, and to 100 g m-2 after two applications (at ear emergence and just before anthesis) of the same fungicide mixture. Triadimefon also increased seed yield to 82 g m-2 (single application) and 90 g m-2 (two applications). Carbendazim and captafol did not increase seed yield. Yield increases resulted from an increase in the number of seeds per spikelet, and an increase in 1000-seed weight, and were related to reductions in stem rust (Puccinia graminis Pers.) infection and delayed leaf tissue senescence. The way in which fungicide use may reduce seed abortion in perennial ryegrass is discussed and the number and timing of fungicide applications considered.

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“…With respect to the effect of honeydew on fungi, it has been demonstrated that the saprophytic phyllosphere mycoflora is able to antagonize infection by necrotrophic pathogens such as Septaria nodorum and Cochliobolus sativus and that this may neutralize negative effects of necrotrophic pathogens on yield (Fokkema et al, 1983). On the other hand, direct detrimental effects of saprophytes on cereal yield are occasionally suggested in attempts to explain unexpected yield increases in fungicide trials with low levels of naturally occurring pathogens (Dickingson and Walpole, 1975;Cook, 1981;Mappes and Hampel, 1977;Priestly and Bayles, 1982). To investigate the potentials of the saprophytes to suppress or reduce necrotrophic fungi through competition, more knowledge is urgently needed about the direct effects of saprophytes on necrotrophic fungi and on crop production in the field (Fokkema, 1981).…”

Section: Introductionmentioning

confidence: 99%

Effects of the saprophytic leaf mycoflora on growth and productivity of winter wheat

Rabbinge

Brouwer²,

Fokkema³

et al. 1984

Netherlands Journal of Plant Pathology

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The effects of the saprophytic mycoflora and its interference with cereal aphids on growth and yield of winter and spring wheat was studied in field experiments in 1980, 1981 and 1982. Yields varied between 5000 and 8000 kg dry matter of kernels per ha. The effect of the saprophytic mycoflora on yield was determined in different treatments: A) no control measures against cereal aphids and saprophytic and necrotrophic fungi, B) no control of cereal aphids, control of saprophytic and necrotrophic fungi, C) control of cereal aphids and control of saprophytic and necrotrophic fungi, D) control of cereal aphids and stimulation of saprophytic mycoflora and E) control of cereal aphids, no control of saprophytic and necrotrophic fungi nor stimulation of saprophytic mycoflora.Considerable differences in top densities of sapropJ:lytic mycoflora (10 times as large in A and D as in B and C) were determined. The consequences of these differences for the growth and productivity of wheat were minor. A negative effect of saprophytic mycoflora on the yield could not be detected in 1981 and 1982, whereas a small positive significant effect was found in 1980. This stimulation may have been due to competition between necrotrophic fungal pathogens and saprophytic mycoflora. As a result of favourable weather conditions necrotrophic fungal pathogens were very numerous in 1980 and could form an important yield reducing factor. Yield levels may effect the importance of the necrotrophic and saprophytic mycoflora as yield reducing factors. Additionally, in the presence of aphid honeydew captafol was found to be relatively ineffective against saprophytic fungi.

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Effect of fungicide treatment on yield of winter wheat and spring barley cultivars

Cited by 23 publications

References 12 publications

Effects of herbicide use, fungicide use and position in the field on the yield and yield components of spring barley

Effects of herbicide use, fungicide use and position in the field on the yield and yield components of spring barley

Fungicidal effects on stem rust, green leaf area, and seed yield in ‘Grasslands Nui’ perennial ryegrass

Effects of the saprophytic leaf mycoflora on growth and productivity of winter wheat

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