Abstract
The relationships between weeds and crops are intimate and ancient, going back at least to the beginnings of agriculture, and since some crops were derived from weedy plants, perhaps the relationships extended into previous proto-agricultural periods. When man or his domesticated animals disturb a natural habitat, a special kind of ecological niche is produced in which weedy plants thrive. Disturbance by overgrazing or trampling, by tillage or burning, by building settlements or roads, cities or superhighways and so on, damages the native flora and habitats are opened up for invasion of pioneering plants that have evolved adaptations suited to disturbed situations.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Åberg, E. (1938). Hordeum agriocrithon Nova sp. a wild six-rowed barley. Ann. Roy. Agr. Col. Sweden 6: 159–216.
Bakhteyev, F. KH. (1964). Origin and phylogeny of barley. In: Barley genetics I: Proc. First Internat’l Barley Genetics Symposium, Wageningen, Centre for Agricultural Publications and Documentation, Wageningen, pp. 1–18.
Browning, J.A. (1974). Relevance of knowledge about natural ecosystems to development of pest management programs for agro-ecosystems. Proc. Amer. Phytopathological Soc. 1: 191–199.
Dave, B.B. (1943). The wild rice problem in the Central Provinces and its solution. Ind. J. Agr. Sci. 13 (1): 46–53.
De Wet, J.M.J., J.R. Harlan and E.G. Price (1976). Variability inSorghum bicolor. In: Origons of African Plant Domestication. J.R. Harlan, J.M.J. de Wet and A.B.L. Stemler (eds.), pp. 453–464. Mouton, The Hague.
Grignac, P. (1978). The evolution of resistance to herbicides in weedy species. Agro-Ecosystems 4: 377–385.
Harlan, H.V. (1929). The weedishness of wild oats. J. Hered. 20: 515–518.
Harlan, J.R. (1975). Crops and Man. Amer. Soc. Agron. Madison, p. 295.
Harlan, J.R. and J.M.J. de Wet (1974). Sympatric evolution in sorghum. Genetics 78: 473–474.
Hills, L.D. (1976). Comfrey, fodder, food and remedy. Universe Books, New York.
Jennings, P.R. (1974). Rice breeding and world food production. Science° 186: 1085–1088.
Johnston, S.K., D.S. Murray and J.C. Williams (1979). Germination and emergence of balloonvine(Cardiospermum halicacabum). Weed Sci. 27: 73–76.
Karper, R.E. and J.R. Quinby (1947). The inheritance of callus formation and seed shedding in sorghum. J. Hered. 38: 211–219.
Knörzer, K.H. (1978). Entwicklung und Ausbreitung des Lein dotters(Camelina sativa s.l.). Berichte der Deutschen Botanischen Gesellschaft 91: 187–195.
Malzew, A.I. (1930). Wild and cultivated oats. Sectio Euavena Griseb. Bull. Appl. Bot., Genet. and PI. Breed. No. 38 (Supplement), 522 pp. + 100 plates. Russian w. Engl. summary.
Oka, H-I and W.T. Chang (1959). The impact of cultivation on populations of wild rice,Oryza sativa f. spontanea. Phyton 13 (2): 105–117.
Sinskaya, E.N. (1930/31). Forms of gold-of-pleasure (Camelina sativa) in their relationship to climate, flax and man. Bull. Appl. Bot., Genet, & Pl. Breed. 25 (2): 98–200.
Vavilov, N.I. (1926). Studies on the origin of cultivated plants. Inst. Appl. Bot., Genet. & Plant Breed. Leningrad, p. 248.
Yabuno, T. (1961).Oryza sativa andEchinochloa crus-galli var.oryzicola. Ohwi. Seiken Ziho 12: 29–34.
Zohary, D. (1959). IsHordeum agriocrithon the ancestor of six-’rowed cultivated barley? Evolution 13: 279–280.
Zohary, D. (1971). Origin of southwest Asiatic cereals: Wheats, barley, oats and rye. In: Plant Life of Soutwest Asia, P.H. Davis et al. (eds.). Bot. Soc. Edinburgh, Edinburgh.
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1982 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Harlan, J.R. (1982). Relationships between weeds and crops. In: Holzner, W., Numata, M. (eds) Biology and ecology of weeds. Geobotany, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0916-3_8
Download citation
DOI: https://doi.org/10.1007/978-94-017-0916-3_8
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-8519-1
Online ISBN: 978-94-017-0916-3
eBook Packages: Springer Book Archive