Efficacy of Castor Oil as a Biopesticide for Treatment of Leucinodes orbitalis Guenee L., a Pest of Eggplant (Solanum melongena) | Chapter 9 | Research Advances and Challenges in Agricultural Sciences Vol. 5

Leucinodes orbonalis Guenee L. is a pest of eggplant. It is currently managed using synthetic chemical s. However, certain plants with insecticidal properties can be used to control Leucinodes orbonalis in eggplant. To study the efficacy of the castor oil solution on Leucinodes orbonalis, a trial was carried out at the ISAV in Faranah from 08/05 to 20/08/2023.Castor oil was extracted using a press machine with a yield of 0.41 l/kg. It was carried out at the station and in the laboratory. The experimental set-up used was a complete randomised block design with four replicates and five treatments. The treatments were D0 = 0 l/ha (control); D1 = 2.5 l/ha; D2 = 5 l/ha and D3 = 7.5 l/ha. The parameters monitored were: incidence of attack, number of plants leafed out and productivity. The survival of Leucinodes orbonalis larva after treatment was also estimated in vitro. The results showed that the incidence of attack after treatment was 68% for the control. However, this incidence was 10, 4 and 2% for doses D1, D2 and D3 respectively. With regard to the number of leafless plants, the rates were 68% for the control, 33% for D1, 17% for D2 and 8% for D3. Productivity was: 3.00 t/ha for the control; 5.00 t/ha for D1; 8.00 t/ha for D2 and 11.02 t/ha for D3. Survival of Leucinodes orbonalis larvae after application of the castor oil solution was 92%, 20%, 10% and 0% respectively for the control, D1, D2 and D3. Analysis of the results shows that the 7.5 l/ha dose of castor oil can be a good biopesticide for controlling Leucinodes orbonalis.

Author(s) Details:

Camara Mamadi Mariame,
Joseph KI-ZERBO University of Burkina Faso / Environmental Physics and Chemistry Laboratory, 03 BP: 7121, Ouagadougou, Burkina Faso and Higher Institute of Agronomy and Veterinary, Plant Protection Laboratory, BP: 131, Faranah, Conakry, Republic of Guinea.

Savadogo Paul Windinpsidi,
Joseph KI-ZERBO University of Burkina Faso / Environmental Physics and Chemistry Laboratory, 03 BP: 7121, Ouagadougou, Burkina Faso and National Centre for Scientific and Technological Research / Institute for the Environment and Agricultural Research (CNRST/INERA), Soil-Water-Plant Laboratory (SEP), 01 BP, 476 Ouagadougou 01, Burkina Faso.

Sangaré Lanciné,
Higher Institute of Agronomy and Veterinary, Plant Protection Laboratory, BP: 131, Faranah, Conakry, Republic of Guinea.

Please see the link here: https://stm.bookpi.org/RACAS-V5/article/view/13915

Critical Research on the Efficacy of Lippia multiflora (Verbenaceae) and Hyptis suaveolens (Lamiaceae) Leaves on Merchant Quality of Stored Maize Grain (Zea mays L.) in Côte d’ivoire |Chapter 8 | New Perspectives in Agriculture and Crop Science Vol. 2

The aim of this study was to monitor the merchant quality of maize grains stored for 9 months in polypropylene bags containing leaves of Lippia multiflora and Hyptis suaveolens, both species of which are known as biopesticides plants. The work was implemented in Timbé and Soko villages from respective departments of Katiola (Hambol region, Center-North) and Bondoukou (Gontougo region, Eastern-North) in Côte d'Ivoire. The parameters assessed consisted in weight loss, damages, moisture, fat, acidity, and peroxide values. The weight losses and damages were determined by methods of Harris, Lindblad and Boxall respectively, while moisture, fat, acid, and peroxide values were measured according to AOAC's standard methods. For any parameter assessed, the maize samples treated with leaves of L. multiflora and H. suaveolens recorded best values compared to control batches irrespective of the species and the study location. Indeed, the moisture varied between 9.00% and 14% from control maize grains and were below 13% in the treated batches. The weight loss rated below 15.25% from treated batches but reached 24.25% for the control maize grains samples. The grains damage was up to 47.40% in the control batches and remained below 32.40% in the treated sets. For the fat content of the grains, the averages decreased from 5.4% to 1.90% for control batches and remained over 2.4% from the treated maize. Oppositely, the acid and peroxide values were higher in control batches compared to the treated ones. Therefore, leaves of L. multiflora and H. suaveolens are successful products in the inhibition of insects activity and preservation of the maize grains quality with up to 9 months persistence. Such an inexpensive and easy-to-use technical should be sustained among farmers.

Author (s) Details 

Pierre Ezoua 
Laboratory of Biochemistry and Food Science, Training and Research Unit of Biosciences, Felix Houphouet-Boigny University of Abidjan, 22 BP 582 Abidjan 22, Cote d’Ivoire.

Adama Coulibaly
Training and Research Unit of Biological Sciences, Peleforo Gon Coulibaly University, BP 1328 Korhogo, Côte d'Ivoire

Ysidor Konan
Laboratory of Biochemistry and Food Science, Training and Research Unit of Biosciences, Felix Houphouet-Boigny University of Abidjan, 22 BP 582 Abidjan 22, Cote d’Ivoire

Daouda Sidibe
 Laboratory of Biochemistry and Food Science, Training and Research Unit of Biosciences, Felix Houphouet-Boigny University of Abidjan, 22 BP 582 Abidjan 22, Cote d’Ivoir

Godi Henri Marius Biego
Laboratory of Biochemistry and Food Science, Training and Research Unit of Biosciences, Felix Houphouet-Boigny University of Abidjan, 22 BP 582 Abidjan 22, Cote d’Ivoire and Department of Public Health, Hydrology and Toxicology, Training and Research Unit of Pharmacological and Biological Sciences, Felix Houphouet-Boigny University, BP 34 Abidjan, Cote d’Ivoire.

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