Plant-based extracts for cotton pest management in Sub-Saharan Africa: a review

Silvie, Pierre

doi:10.1080/23818107.2022.2122556

Cited by 7 publications

(2 citation statements)

References 37 publications

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“…The most prominent among these species include A. indica, Cassia nigricans, Ocimum gratissimum, Cymbopogon citratus, and Citrus sp., as well as Anacardium occidentale and Hyptis suaveolens. The findings of this investigation strongly suggest that the oil extracts derived from these plants possess significant potential in substituting synthetic pesticides [60]. The aforementioned studies provide evidence of the efficacy of these compounds as biopesticides, particularly in terms of their compatibility with natural enemies, which represents a significant advantage.…”

Section: Application Of Plant Extract Benefits and Limitationsmentioning

confidence: 57%

Potential Biopesticides from Seed Extracts: A Sustainable Way to Protect Cotton Crops from Bollworm Damage

Chamani,

Askari,

Pourabad

et al. 2023

Sustainability

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In the current study, the inhibitory effect of extracts from Gramineae (wheat, barley, and corn) and Leguminosae (sophora, bean, and pea) seeds was studied on the digestive alpha-amylase activity in cotton bollworm (Helicoverpa armigera Hubner). The insect was bred on artificial food based on Vigna unguiculata in the greenhouse condition (26 ± 2 °C, 60 ± 10% (Relative Humidity), R.H., 16:8 (Light: Darkness), L: D). The extracts of wheat (95.2%), barley (84.6%), corn (73.8%), sophora (77%), Vigna unguiculata (52%), and pea (56.7%) significantly inhibited the alpha-amylase activity in H. armigera. Studying the impact of different fractions (obtained via deposition at various concentrations of ammonium sulfate salt) on the alpha-amylase enzyme activity demonstrated that in 0–30% fractions, wheat, barley, and sophora have the highest effect (95.26%, 94.65%, and 94.73%, respectively) compared to the other fractions. The inhibitory activities of 0–30% fractions of corn, bean, and pea were 83.3, 56.94, and 50.92%, respectively. In 30–50% fractions, the most effective ones were those of wheat and barley with the inhibitory activity of 79.7% and 82.9%, respectively. In addition, bean and pea fractions inhibited 25.2% and 27.5%, in that order. No significant inhibitory impact was detected in 50–70% or higher fractions. The investigation of the impact of pH values (i.e., 2, 4, 8, and 10) on the inhibition of the alpha-amylase enzyme activity introduced 8–10 as the optimum pH in H. armigera. Nanotechnology offers several ways to enhance plant-based pesticides, which are a solution for making plant extract usage more efficient. The exploration of plant-based pesticides, in conjunction with the incorporation of nanotechnology and other scientific fields, offers a wide range of prospects for further investigation.

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Section: Application Of Plant Extract Benefits and Limitationsmentioning

confidence: 57%

Potential Biopesticides from Seed Extracts: A Sustainable Way to Protect Cotton Crops from Bollworm Damage

Chamani,

Askari,

Pourabad

et al. 2023

Sustainability

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“…However, in the case of our work, of all the plants evaluated, the aqueous extract of cashew leaves ( A. occidentale ) was the most effective against the larvae of H. armigera . Even though very few studies have been conducted on the insecticidal activity of Anacardium occidentale extracts as mentioned in the recent publication of Silvie (2022), however, a number of works mention hypoglycemic (Sokeng et al, 2001), antibacterial (Santos et al, 2013), antimicrobial (Edilane et al, 2016), molluscicidal (Aracelli et al, 2016) properties this extract. In addition, research studies conducted by Azonkpin et al (Azonkpin et al, 2018) revealed that cashew balsam has a regulatory effect on cotton carpophagous caterpillar populations and their damage on green and mature cotton bolls.…”

Section: Discussionmentioning

confidence: 99%

Phytochemical profiling, antioxidant activities, enzymatic activities and insecticidal potential of aqueous extracts of four plants on the larvae of Helicoverpa armigera (Lepidoptera: Noctuidae), the main pest of cotton plant in Ivory Coast

Bini

Kobenan

Kouakou

et al. 2023

Arch Insect Biochem Physiol

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In the context of climate change, the Ivorian cotton industry is facing with the loss of sensitivity of pests (Helicoverpa armigera) and the appearance of new so‐called emerging insects. Faced with this situation, cotton producers tend to use insecticide products in high doses, in excess of the norm. However, the misuse of chemical products poses many health risks. Therefore, to limit the use of chemicals, aqueous extracts of local plants with insecticidal properties were examined in the laboratory and in the field. Four local plant species were selected [Anacardium occidentale (Anarcardier); Azadirachta indica (Neem); Hyptis suaveolens (Hyptis) and Tephrosia vogelii (Tephrosia)]. After determining the chemical profiles of the four extracts by high performance liquid chromatography (HPLC)‐mass spectrometry, their inhibitory activities were assessed in cholinesterase and tyrosinase. The sensitivity of Helicoverpa armigera larvae was evaluated by ingesting the aqueous extracts at several concentrations ranging from 2% to 64% in an artificial nutrient substrate. Then, the mortality rates of the larvae during 72 h were evaluated and the lethal concentrations were determined. The results of chemical analyses (HPLC) showed that the richest aqueous extract in phytochemicals with 54 elements detected was that of cashew (A. occidentale). T. vogelii, A. indica and H. suaveolens presented 44, 45, and 39 chemical compounds, respectively. In addition, the total phenolic content was higher in A. occidentale (110.67 mg gallic acid equivalents/g) followed by A. indica (42.43 mg gallic acid equivalents/g). The highest antioxidant ability was observed with the aqueous extract of cashew (A. occidentale). Anti‐enzymatic activities such as acetylcholinesterase, butyrylcholinesterase and tyrosinase inhibition were most pronounced in A. occidentale (2.35 ± 0.02 mg galanthamine equivalent/g, 3.77 ± 0.01 mg galanthamine equivalent/g and 71.28 ± 0.07 mg kojic acid equivalent/g, respectively). The most toxic aqueous extract for H. armigera larvae was that of cashew with a lethal concentration LC50 = 11.68%. Moreover, the principal component analysis performed showed that the insecticidal activity is strongly correlated with the antioxidant and enzymatic activities of the aqueous extracts. Then, the hierarchical ascending classification showed cashew as the best plant. For the sustainability of cotton production, it would be necessary to limit the use of chemical‐synthetic insecticides through the use of plant extracts, especially from cashew leaves.

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Effect of biological activity of Carapa procera seed oil on the tomato leaf miner, Tuta absoluta

et al. 2023

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Tuta absoluta poses a serious threat to tomato production worldwide as it can cause more than 80% yield losses. Its control is currently mainly based on the use of synthetic chemical insecticides, which unfortunately selects resistant populations and entails public health risks. The aim of this study was to evaluate the insecticidal, repellent and sublethal effects of Carapa procera seed oil on all stages of T. absoluta. Larvicidal (by contact and by ingestion), ovicidal and anti-feeding effects were evaluated by testing 1.5%, 3%, 4.5%, 6% and 7.5% concentrations of oil. Larvicidal and ovicidal effects were tested by direct application of Carapa solutions on larvae and eggs but also by feeding the larvae leaves dipped in solutions. The adult repellent effect was investigated by identifying the preferred area on lter paper partly non-treated vs fully treated using LC 10 , LC 50 et LC 90 of larvae after ingestion. LC 50 was also used on 2-day-old larvae to evaluate the sublethal effects on larval and pupal duration, longevity and adult morphology. Results showed that, regardless of the mode of application, all concentrations had larvicidal effects with a higher dose-response effect and a higher mortality rate via ingestion than via topical application. The ovicidal effect varied with the concentrations tested, the highest mortality rate was obtained at a concentration of 7.5%. At the same dose, Carapa oil reduced large feeding galleries from 92.22 ± 5.02% in controls to 3.33 ± 3.65% at the highest dose and had a repellent effect on 80% of adults.Carapa oil increased larval and pupal duration by 2.14 and 1.35 days, respectively, and reduced adult female longevity by 2.2 days and male longevity by 1.1 days. A deformation rate of 28.33% was observed in newly emerged adults. This study demonstrated insecticidal and insect repellent effects of Carapa oil on different stages of T. absoluta. This botanical oil is a very promising biopesticide to control this major new pest of Solanaceous crops. Its use in an agroecological pest management strategy is discussed.

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Plant-based extracts for cotton pest management in Sub-Saharan Africa: a review

Cited by 7 publications

References 37 publications

Potential Biopesticides from Seed Extracts: A Sustainable Way to Protect Cotton Crops from Bollworm Damage

Potential Biopesticides from Seed Extracts: A Sustainable Way to Protect Cotton Crops from Bollworm Damage

Phytochemical profiling, antioxidant activities, enzymatic activities and insecticidal potential of aqueous extracts of four plants on the larvae of Helicoverpa armigera (Lepidoptera: Noctuidae), the main pest of cotton plant in Ivory Coast

Effect of biological activity of Carapa procera seed oil on the tomato leaf miner, Tuta absoluta

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