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A biological phenomenon in him which one organism produces secondary metabolites that have either beneficial (positive) allelopathy or detrimental (negative) allelopathy on target organisms.

Examples of organisms displaying allelopathy
Plants, algae, bacteria, coral and fungi. These interactions influence species distribution and abundance within plant communities and ecosystems.

allelopathy (l·lēˑ·l·pa·thē),

n the system of natural defenses that protects one plant species from others around it.
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Potential allelopathic effects of Brazilian pepper (Schinus terebinthifolius Raddi, Anacardiaceae) aqueous extract on germination and growth of selected Florida native plants.
development stages on some phytochemicals content and allelopathic potential.
Many terpenoids are known to possess allelopathic properties (Reigosa et al.
Considering the occurrence of the species of Erythroxylum in the chapada do Araripe and the lack of knowledge concerning their allelopathic potential, the aim of this study was to determine the allelopathic potential of five species of Erythroxylum growing in cerrado areas in chapada do Araripe, Ceara State, Brazil with regard to the germination and initial growth of Lycopersicum esculentum Mill (tomato) and Allium cepa L (onion).
Progress in research on allelopathic potential in an exotic invasive plant Eupatorium adenophorum, Journal of Agricultural Science and Technology 10(SI): 30-34.
A comparison of landscape mulches: chemical, allelopathic, and decomposition properties.
Effects of Allelopathic Intraspecific Competitions on Growth of Privet, Ligustrum sinese.
Perpetual weeds increase their competitive advantage against crops through releasing allelopathic chemicals.
Hussain S, Siddique SU, Jamal A, Abdul Q and Z Ahmad Allelopathic potential of senna (Cassia angustifolia Vahl.
Among specific topics are the curing behavior of epoxy containing siloxane, photometric analysis reagents of rare earths and their applications in metallurgical analysis, applying rhamnilipid biosurfactant to remove polychlorinated diphenyls from contaminated soil, cake fouling mechanism and the analysis of synthetic coke wastewater treatment by membrane bioreactor, turbulent drag reduction in journal bearings by polymer additives, hydroxylation of benzene catalyzed by supported phthalocyanine catalysts, modeling kinetics and grain density evolution during isothermal phase transformation, a new bimetal floating seal of high-speed roller bit bearings, the chemical composition and allelopathic potential of the essential oil from Datura stramonium L.
Phragmites are also allelopathic, he says, meaning that they secrete a compound which interferes with the growth of many other plants.