Phytochemical activity and role of botanical pesticides in pest management for sustainable agricultural crop production

Lengai, Geraldin M. W.; Muthomi, James W.; Mbega, Ernest R.

doi:10.1016/j.sciaf.2019.e00239

Cited by 280 publications

(241 citation statements)

References 65 publications

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“…Botanical insecticides have features of selectivity, low toxicity to livestock and natural enemies, with a few exception, low mammalian toxicity [ 7 , 8 ]. Botanical insecticides, particularly those plant-derived extracts from local farmers, are relatively cheaper in preparation and convenient in application with lower cost, due to the locally grown plants for local use in comparison to the use of synthetic ones [ 9 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Plants in the Genus Tephrosia: Valuable Resources for Botanical Insecticides

Zhang

Qin

Chen

et al. 2020

Insects

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Synthetic insecticides are effective in controlling insect pests but can also harm nontarget organisms and the environment. During the last 40 years, there has been an increasing interest in alternative insecticides, particularly those derived from plants, commonly known as botanical insecticides. However, commercially available botanical insecticides remain limited. Rotenone is one of the earliest identified compounds and was used as fish poison and pest management. Due to its link with Parkinson disease, the use of rotenone was banned in many developed countries. Rotenone used to be isolated from Derris spp. and Lonchocarpus spp., and it can also be isolated from Tephrosia species. In this article, we present basic botanical information on selected Tephrosia species and their major compounds related to insecticidal activities and highlight the current use of extracts derived from some species, Tephrosia vogelii in particular, for control of insect pests in stored grains and crop production. The crude extracts contain multiple bioactive compounds, mainly rotenone, deguelin, rotenolone, and tephrosin, which act in either additive or synergistic fashion, resulting in effective control of insect pests. There are about 400 species in the genus Tephrosia, and species and even strains or variants vary greatly in these active compounds. We argue that a systematic evaluation of bioactive compounds in different species are needed, and species or strains with high insecticidal activities should be selected for use in the sustainable control of insect pests.

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Section: Introductionmentioning

confidence: 99%

Plants in the Genus Tephrosia: Valuable Resources for Botanical Insecticides

Zhang

Qin

Chen

et al. 2020

Insects

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“…This suggests the occurrence of detrimental changes in the membrane functionality affecting feeding capability and the pathogen growth [ 55 ]. In our study, the observed translucency and cytoplasmic coagulation may indicate the occurrence of the cellular content leakage and cellular collapse as irremediable consequence of the plasma membrane disintegration affecting functionality and structural shape [ 56 ]. Accordingly, Solanum extracts have been seen to cause morphological alterations in Curvularia lunata consisting in reduced size and shape of conidia and marked hyphal septation [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

Managing Rhizoctonia Damping-Off of Rocket (Eruca sativa) Seedlings by Drench Application of Bioactive Potato Leaf Phytochemical Extracts

Pane

Caputo

Francese

et al. 2020

Biology

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Plants produce a huge array of secondary metabolites that play a key role in defense mechanisms against detrimental microorganisms and herbivores, and represent a suitable alternative to synthetic fungicides in sustainable agriculture. In this work, twelve crude hydroethanolic extracts derived from leaves of different potato cultivars were chemically characterized by LC/MS and their antioxidant properties were investigated in vitro. Furthermore, the biological activity against the fungal pathogen Rhizoctonia solani was evaluated both in vitro and in vivo. Extracts showed the ability to inhibit R. solani growth in vitro and significantly reduced damping-off incidence in in vivo experiments. Furthermore, R. solani mycelia exposed to the extracts showed an altered morphology (low translucency, irregular silhouette, and cytoplasmatic content coagulation) compared to the untreated control in light microscopy examination. Principal component analysis conducted on identified chemical compounds highlighted significant metabolic variations across the different extracts. In particular, those that inhibited most of the growth of the pathogen were found to be enriched in α-chaconine or α-solanine content, indicating that their biological activity is affected by the abundance of these metabolites. These results clearly indicated that plant-derived compounds represent a suitable alternative to chemicals and could lead to the development of new formulates for sustainable control of plant diseases.

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“…The intensive use of synthetic pesticides has resulted in damage to the environment, health hazards, and loss of biodiversity [4,5], so it is necessary to adopt less harmful strategies that can include the use of natural-based pesticides, which will result in a healthy environment and sustainable agriculture [6,7]. The concomitant use of natural pesticides/semisynthetic pesticides and synthetic pesticides could also take place as a changeover alternative to circumvent several negative effects of the exclusive use of synthetic compounds [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…EOs are typically characterized by a low melting point; most of them are liquid at room temperature, and their application in plant protection has some limitations, due to their poor solubility in water and high volatility. However, they display efficacy, biodegradability, various modes of action, and low toxicity, as well as an availability of source materials [6].…”

Section: Introductionmentioning

confidence: 99%

New Eugenol Derivatives with Enhanced Insecticidal Activity

Fernandes

Pereira

et al. 2020

IJMS

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Eugenol, the generic name of 4-allyl-2-methoxyphenol, is the major component of clove essential oil, and has demonstrated relevant biological potential with well-known antimicrobial and antioxidant actions. New O-alkylated eugenol derivatives, bearing a propyl chain with terminals like hydrogen, hydroxyl, ester, chlorine, and carboxylic acid, were synthesized in the present work. These compounds were later subjected to epoxidation conditions to give the corresponding oxiranes. All derivatives were evaluated against their effect upon the viability of insect cell line Sf9 (Spodoptera frugiperda), demonstrating that structural changes elicit marked effects in terms of potency. In addition, the most promising molecules were evaluated for their impact in cell morphology, caspase-like activity, and potential toxicity towards human cells. Some molecules stood out in terms of toxicity towards insect cells, with morphological assessment of treated cells showing chromatin condensation and fragmentation, which are compatible with the occurrence of programmed cell death, later confirmed by evaluation of caspase-like activity. These findings point out the potential use of eugenol derivatives as semisynthetic insecticides from plant natural products.

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Phytochemical activity and role of botanical pesticides in pest management for sustainable agricultural crop production

Cited by 280 publications

References 65 publications

Plants in the Genus Tephrosia: Valuable Resources for Botanical Insecticides

Plants in the Genus Tephrosia: Valuable Resources for Botanical Insecticides

Managing Rhizoctonia Damping-Off of Rocket (Eruca sativa) Seedlings by Drench Application of Bioactive Potato Leaf Phytochemical Extracts

New Eugenol Derivatives with Enhanced Insecticidal Activity

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