**Author details**

*Essential Oils - Bioactive Compounds, New Perspectives and Applications*

**compounds**

*Nepeta cataria* Nepetalactone *Hordeum spontaneum* 

*Zanthoxylum piperitum* Xanthoxyline *Amaranthus tricolor* [90]

α-Pinene ρ-Cymene α-Terpineol

δ-Cadinene Caryophyllene

Thymol

Citronellol

Germacrene-D β-Caryophyllene, α-humulene, *δ*-elemene, and *δ*-cadinene

**Affected weed species Ref.**

[87]

[88]

[89]

[91]

[92]

[93]

*S. arvensis Erica vesicaria Scorpiurus muricatus*

*Taraxacum officinale Avena fatua*

*P. canariensis Trifolium campestre S. arvensis*

*P. oleracea Lolium multiflorum E. crus-galli*

*S. arvensis Sonchus oleraceus Xanthium strumarium*

*A. fatua*

*Mimosa pudica L. Senna obtusifolia*

**Donor plant Involved terpenoid** 

*Eucalyptus cinerea* 1,8-Cineole

*Pinus nigra* Germacrene D

*Satureja montana* Carvacrol

*Eucalyptus citriodora* Citronellal

In this chapter, we presented a detail overview about roles of terpenoids in essential oils as a natural weed killer on a wide range of weed species according to the latest investigations conducted in the current decade. Terpenoids can be useful to control weeds which should be considered as a new approach agricultural sustainable to reduce weed losses and keeping the environment safe from the risks of synthetic herbicides. The current review also turns out that monoterpenoids showed the highest phytotoxicity in comparison to the sesquiterpenoids when these

*Allelopathic effects of terpenoids compounds in essential oils on seed germination and seedling development on* 

types considered the dominant compounds found in essential oils.

**202**

**8. Conclusion**

*different weed species 2010–current.*

**Table 2.**

*Copaifera duckei Copaifera martii Copaifera reticulata*

> Ahmed Abdulwahid Ali Almarie College of Agriculture, University of Anbar, Anbar, Iraq

\*Address all correspondence to: ahmedalmaree@yahoo.com; ag.ahmed.abdalwahed@uoanbar.edu.iq

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
