Weed distribution

Holm, L.G., D.L. Plucknett, J.V. Pancho, and J.B. Herberger (1977). The World s Worst Weeds Distribution and Biology. Hawaii ... 

Stephenson, G.R., M.D. Dykstra, R.D. McLaren, and A.S. Hamill (1990). Agronomic practices influencing triazine-resistant weed distribution in Ontario. Weed Technol., 4 199-207. 

Holm L.G, Plucknett D.L., Pancho J.V., Herberger J.P. The World s Worst Weeds - Distribution and Biology. University Press of Hawaii, Honolulu. 1977. 

Holm, L. G. Plucknett, D. L. Pancho, J. V. Herberger, J. P. The World s Worst Weeds Distribution and Biology East-West Center, Univ. Hawaii Honolulu, 1977 p 609. 

Frankenberger, Jr., and Muhammad Arshad Handbook of Weed Management Systems, edited by Albert E. Smith Soil Sampling, Preparation, and Analysis, Kim H. Tan Soil Erosion, Conservation, and Rehabilitation, edited by Menachem Agassi Plant Roots The Hidden Half, Second Edition, Revised and Expanded, edited by Yoav Waisel, Amram Eshel, and Uzi Kafkafi Photoassimilate Distribution in Plants and Crops Source-Sink Relationships, edited by Eli Zamski and Arthur A. Schaffer Mass Spectrometry of Soils, edited by Thomas W. Boutton and Shinichi Yamasaki... 

A third type of probability distribution frequently encountered in nature is where the occurence of one event at some location increases the probability of other events being observed nearby. This leads to clumping or patchiness, characteristic of many biological systems such as weed or insect infestations, and mold growth in stored grains. 

Studies on Piqueria trinervia. A very interesting study is that of the allelopathic potential of Piqueria trinervia and its piquerols A and B, by Gonzalez de la Parra et al. (14). It was found that this widely distributed weed in the Valley of Mexico has a wide biological activity upon other plants. 

Diffuse (Centaurea diffusa) and spotted knapweed (C. maculosa) are two introduced weeds that have expanded to occupy large areas of rangeland in the dry Interior of the Pacific Northwest. The apparent ability of knapweed to invade established, productive rangeland has been attributed to the action of allelochemicals produced by knapweed (i., ). The potential allelopathic effect of plants such as knapweed is an area of considerable Interest, with researchers looking to exploit this phenomenon in agricultural situations, or simply to explain patterns of plant distribution ( ). 

The World s Worst Weeds, Biology and Distributions" Univ. 

In indigenous plant communities, allelopathy may determine the distribution patterns of plants in relation to their neighbors, whereas in agriculture and forestry allelopathy may affect yields. For example, weeds with allelopathic potential or crops that produce autotoxic aftereffects may reduce yields Conversely, using crops with the allelopathic potential to decimate weeds may improve yields. 

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