By R. J. Stephens
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Additional resources for Theory and Practice of Weed Control
Example text
Occasional and irregular flushes of germination may suggest another type of distribution; but there can be other explanations. For example, this behaviour in Wild-oat (Avena fatua) has been attributed to seasonal periods of great microbial activity leading to breakdown of the pericarp, which then allows chemical inhibitors to escape, thus releasing the seed from innate dormancy. 5 Weed seed polymorphism There are many examples of seed polymorphism in which visible differences in colour, size or form are matched by behavioural ones.
1972). Migration of weeds, in Taxonomy, Phytogeography and Evolution (ed. D. H. Valentine), Academic Press, London, p. 431 BAKER, H. G. (1974). The evolution of weeds, Ann. Rev. Ecol. , 5, 1-24 BLACK, C. , CHEN, T. M. and BROWN, R. H. (1969). , 17, 338-344 BURROWS, F. M. (1974). Wind dispersal of weed seeds, Proceedings 12th British Weed Control Conference, pp. 1121-1129 DAVISON, j. G. and ROBERTS, H. A. (1976). Influence of changing husbandry on weeds and weed control in horticulture, Proceedings 1976 British Crop Protection Conference - Weeds, 2, 1009-1017 FRYER, J.
The numbers of seeds were not large compared with the potential number of new seeds produced in a weedy field, but 100 seeds/m 2/annum is still quite large enough to vitiate the effect of other control measures, and the screening of irrigation mains is recommended (Kelley and Bruns, 1975). But perhaps the real significance of waterborne weed seeds is qualitative rather than quantitative, because irrigation water is the perfect medium for distributing the seeds of a weed new to the area. 4 Weed Evolution Evolution of living organisms is a continuing process although it is sometimes wrongly considered to have begun and ended in the past.