Abstract
The improvement of pastures by the use of a range of herbicides to eliminate grasses, and their effect on populations of the take-all fungus (Gaeumannomyces graminis vartritici=Ggt) were studied in the field (at Esperance Downs, on the south-coast of Western Australia) from 1982 to 1985. Field trials were conducted to evaluate three herbicide treatments (2,4-D amine+propyzamide; 2,4-D amine+paraquat; paraquat/ diquat) and an unsprayed control. A pot trial involving these treatments with two levels of nitrogen was undertaken to confirm treatment effects observed in the field trial.
All herbicide treatments resulted in reduced grass composition of pastures, in both the year of spraying and in the second year of pasture, but reduced dry matter production in the year of spraying. In the year of spraying, however, inoculum ofGgt was reduced (P<0.1) only following the 2,4-D amine+propyzamide treatment and was greater (P<0.1) after 2,4-D amine+paraquat treatment than the unsprayed treatment. Despite reduced grass levels in the herbicide-treated plots in the second year of pasture,Ggt inoculum did not differ between treatments, nor did it after a wheat crop which followed a second year pasture.
There was high correlation (P<0.001) between disease levels and dry weights of grasses in the pot trial. There was significantly less (P<0.001) grass in pots treated with herbicides compared to the unsprayed control but no difference (P>0.05) was evident between treatments. Inoculum levels were lower (P<0.05) in the treated pots than the unsprayed control with no evidence of differences among treatments (P>0.05). Nitrogen level had no effect on disease (P>0.05).
All herbicide treatments tested reduced grass level and total dry matter, both in the field and in pots. Whereas in the pot trial reduced grass levels resulted in reducedGgt inoculum, in the field such a reduction occurred only with the 2,4-D amine+propyzamide treatment and only in the year of spraying. Herbicide treatments had no effect onGgt inoculum in second year of pasture or crop. Unknown soil and environmental factors in the field precluded a simple relationship between grass level in pasture and subsequent level ofGgt inoculum, and where such a relationship did occur (2,4-D amine+propyzamide treatment) it appeared to be shortlived.
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References
Allison L E 1965 Organic Carbon.In Methods of Soil Analysis Part 2. Chemical and Microbiological Properties. pp 75–101. Eds. C A Black, D D Evans, J L White, L E Ensiminger, F E Clark and R C Dinauer. Second edition. American Society of Agronomy In., Wisconsin.
Altman J 1969 Predisposition of sugarbeets toRhizoctonia solani damping off with herbicides. Phytopathology 59, 1015.
Altman J and Campbell C L 1977 Effect of herbicides on plant diseases. Annu. Rev. Phytopathol. 15, 361–385.
Altman J and Ross M 1965 Unexpected preplant herbicide damage in sugarbeets. Phytopathology 55, 1051.
Altman J and Ross M 1967 Plant pathogens as a possible factor in unexpected preplant herbicide damage in sugarbeets. Pl. Dis. Reptr. 51, 86–88.
Cerkauskas R F and Sinclair J B 1980 Use of paraquat to aid detection of fungi in soybean tissues. Phytopathology 70, 1036–1038.
Chambers S C 1963 Planned crop rotations may reduce take-all of wheat on the Esperance Downs. J. Agric. Western Australia. 4 (4th Series), 488–492.
Deacon J W 1973Phialophora radicicola andGaeumannomyces graminis on roots of grasses and cereals. Trans. Br. Mycol. Soc. 61, 471–492.
Deacon J W 1981 Ecological relationships with other fungi: competitors and hyperparasites. pp. 75–101.In Biology and Control of Take-all. Eds. M J C Asher and P J Shipton. Academic Press, London.
Garrett S D 1967 Effect of nitrogen level on survival ofOphiobolus graminis in pure culture on cellulose. Trans. Br. Mycol. Soc. 50, 519–524.
Large E C 1954 Growth stages in cereals. Illustrations of the Feeke's scale. Pl. Pathol. 3, 128–129.
MacNish G C 1980 Management of cereals for control of take-all. J. Agric. Western Australia 21 (4th Series), 48–51.
Mannetje L't and Haydock K P 1963 The dry-weight-rank method for the botanical analysis of pasture. J. Br. Grassl. Soc. 18, 268–275.
McKinney H H 1923 Influence of soil temperature and moisture on infection of wheat seedlings byHelminthosporium sativum. Agric. Res. 26, 195–217.
Mekwatanakarn P and Sivasithamparam K 1987a Effect of certain herbicides on growth on agar and pathogenicity on wheat of take-all fungus. Biol. Fertil. Soils 4. (In press)
Mekwatanakarn P and Sivasithamparam K 1987b Effect of certain herbicides on soil microbial populations and their influence on saprophytic growth in soil and pathogenicity of take-all fungus. Biol. Fertil. Soils 4. (In press)
Mekwatanakarn P and Sivasithamparam K 1987c Effect of certain herbicides on saprophytic survival and biological suppression of the take-all fungus. New Phytol. 106, 153–159.
Newman E I 1966 A method of estimating the total length of root in a sample. J. Appl. Ecol. 3, 139–145.
Nilsson H E 1973 Influence of the herbicide Mecoprop onGaeumannomyces graminis and take-all disease of spring wheat. Swed. J. Agric. Res. 3, 1105–113.
Nilsson H E and Larsson B 1978 Effect of Mecoprop and Bentazon on take-all disease and plant growth of barley. Swed. J. Agric. Res. 8, 203–207.
Northcote K H, Bettenay E, Churchward H M and McArthur W M 1967 Atlas of Australian Soils. Explanatory Data Sheet 5 Perth-Albany-Esperance Area. CSIRO/Melbourne University Press, Melbourne.
Papavizas G C and Lewis A 1979 Side-effects of pesticides on soil-borne plant pathogens pp 483–505.In Soil Borne Plant Pathogens. Eds. B Schippers and W Gams. Academic Press, London.
Puckridge D W and French R J 1983 The annual legume pasture in cereal-ley farming systems of southern Australia: A review. Agric. Ecos. Env. 9, 229–267.
Scott P R 1970Phialophora radicicola, an avirulent parasite of wheat and grass roots. Trans. Br. Mycol. Soc. 55, 163–167.
Sivasithamparam K and Rowland I 1985 Propagule behaviour of the take-all fungus (Gaeumannomyces graminis var.tritici) at a field site Western Australia. Proc. Ind. Acad. Sci. 94, 91–97.
Thorn C W and Perry M W 1983 Regulating pasture composition with herbicides. J. Agric. Western Australia 24 (4th Series), 21–26.
Wilkinson V and Lucas R L 1969 Effects of herbicides on the growth of soil fungi. New Phytol. 68, 709–719.
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Cotterill, P.J., De'Ath, A.G., Thorn, C.W. et al. Effect of certain herbicide treatments on pasture composition and inoculum of the take-all fungus. Plant Soil 105, 153–161 (1988). https://doi.org/10.1007/BF02376778
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DOI: https://doi.org/10.1007/BF02376778