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 (ə-lē-lŏp′ə-thē, ăl′ə-)
A usually negative effect on the growth or development of an organism of one species, caused by a chemical released by an organism of another species. Usually used of plants.

[Greek allēlōn, reciprocally (from allos, another; see al- in Indo-European roots) + -pathy.]

al·le′lo·path′ic (ə-lē′lə-păth′ĭk, ə-lĕl′ə-) adj.


(Botany) the inhibitory effect of one living plant upon another by the release of toxic substances
[from French allélopathie, from Greek allēl- one another + pathos suffering]


(ə liˈlɒp ə θi, ˌæl əˈlɒp-)

suppression of growth of a plant by a toxin released from a nearby plant.
[1940–45; < French allélopathie; see allele, -pathy]
al•le•lo•path•ic (əˌli ləˈpæθ ɪk, əˌlɛl ə-) adj.
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It contains 21 chapters that cover weed ecology and integrated weed management principles, including weed population dynamics, weed-plant interactions, invasive weed species and their effects, ethical issues, surveillance, risk assessment, and planning an integrated weed management program; the role of herbicides, including site-specific weed management, assessing and minimizing environmental effects, and trends in the development of herbicide-resistant weeds; cultural and physical methods of weed control, such as the use of rotations and cover crops, flame weeding techniques, soil solarization, and organic crop cultivation; and biological techniques, including the use of allelopathy and competitive crop cultivars, bioherbicides, and microorganisms, bacteria, and insects.
Allelopathy may also be a useful means of biological weed control, especially when integrated into pest management systems, reducing dependence upon synthetic herbicides.
The Impact of Competition and Allelopathy on the Trade-Off between Plant Defense and Growth in Two Contrasting Tree Species.
The allelopathy occurs through the release of chemical substances called allelochemicals that can act as "natural herbicides", reducing competition for resources; the release occurs through the decomposition of leaves and stems and direct exudation into the soil by the roots, among other ways.
In this way, some species are able to change the environment of others via chemicals released mostly into the soil, a phenomenon known as allelopathy (Rice, 1984).
Physiological and biochemical mechanism of allelopathy of secalonic acid on higher plants.
Allelopathy is basically defined as the influence or the impact of a plant on the growth of the other plant and microorganisms by releasing certain chemical compound.
Allelopathy refers to the release of some substances by plants in the environment that could have a harmful or beneficial effect on other plants, , Such substances can be essential oils, resins, alkaloids, flavonoids, tannins, among other compounds (Rice, 1984; Taiz & Zeiger, 2004).