Summary
Environmentally controlled experiments on damping-off disease of garden cress (Lepidium sativum) caused by Pythium irregulare were used to study the effect of clumped planting patterns upon epidemic rates. In clumped stands of seedlings the rate of multiplication of disease was, in general, slower than in unclumped, evenly spaced stands of the same overall density. When the number of clumps per unit area was varied, but the proportion of the total area occupied by clumps kept constant, there was no significant change in the rate of linear advance of the disease between different treatments, but the multiplication rate in randomly inoculated plots was higher at 100 clumps/m2 than 200 clumps/m2 due to an unexpected interaction between the multiplication rate and the distribution of primary disease foci. When the area occupied by clumps was varied, but the number of clumps per unit area and the overall plant density were kept constant, both the multiplication rate and the rate of linear advance of the disease were significantly reduced in the stands with the most condensed clumps.
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References
Balch, R.E.: The spruce budworm and forest management in the Maritime Provinces. Proc. Can. Dept. Agric., Ent. Div., Publ. No. 60 (1946)
Bloomberg, W.J.: Fusarium root rot of Douglas fir seedlings. Phytopathology 63, 337–341 (1973)
Burdon, J.J., Chilvers, G.A.: Epidemiology of damping-off disease (Pythium irregulare) in relation to density of Lepidium stativum seedlings. Ann. appl. Biol. 81, 135–143 (1975a)
Burdon, J.J., Chilvers, G.A.: A comparison between host density and inoculum density effects on the frequency of primary infection foci in Pythium induced damping-off disease. Aust. J. Bot. 23, (in press, 1975b)
Burdon, J.J., Chilvers, G.A.: Epidemiology of Pythium induced damping-off disease in mixed species seedling stands. Ann. appl. Biol. 82 (in press, 1976)
Cheke, R.A.: Experiments on the effect of host spatial distribution on the numerical response of parasitoids. J. Anim. Ecol. 43, 107–114 (1974)
Chilvers, G.A.: A particulate inoculum for non-sporing fungi. Nature (Lond.) 195, 93–94 (1962)
Dade, W.A., Gunnell, J.: Class work with fungi. Kew: C.M.I. 1966
Kershaw, K.A.: A study of pattern in certain plant communities. Ph. D. Thesis, University of Wales (1957)
Mott, J.J., McComb, A.J.: Patterns in annual vegetation and soil microrelief in an arid region of Western Australia. J. Ecol. 62, 115–126 (1974)
Murdle, G., Hassell, M.P.: Food distribution, searching success and predator-prey models. In: The mathematical theory of the dynamics of biological populations, (M.S. Bartlett, R.W. Hiorns, eds.), p. 87–102. London: Academic Press 1973
Phillips, M.E.: Studies in the quantitative morphology and ecology of Eriophorum angustifolium Roth. III. The leafy shoot. New Phytol. 53, 312–343 (1954)
Pielou, E.C.: An introduction to mathematical ecology. New York: Wiley 1969
Pielou, E.C., Foster, R.E.: A test to compare the incidence of disease in isolated and crowded trees. Canad. J. Bot. 40, 1176–1179 (1962)
Pimentel, D., Nagel, W.P., Madden, J.L.: Space-time structure of the environment and the survival of parasite-host systems. Amer. Nat. 97, 141–167 (1963)
Platt, W.J., Hill, G.R., Clark, S.: Seed production in a prairie legume (Astragalus canadensis L.). Interactions between pollination, predispersal seed predation and plant density. Oecologia (Berl.) 17, 55–63 (1974)
Van der Plank, J.E.: Plant diseases: epidemics and control. London: Academic Press 1963
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Burdon, J.J., Chilvers, G.A. The effect of clumped planting patterns on epidemics of damping-off disease in cress seedlings. Oecologia 23, 17–29 (1976). https://doi.org/10.1007/BF00351212
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DOI: https://doi.org/10.1007/BF00351212