Repellence and fumigant toxicity of essential oils of Ocimum gratissimum and Ocimum kilimandscharicum on Tuta absoluta (Lepidoptera: Gelechiidae)

Tuta absoluta Meyrick originates in South America and is now one of the most important insect pests of Solanaceae in different parts of the world, including Africa. Its control has relied primarily on chemical insecticides, which are associated with negative ecological effects. In the present study,...

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Bibliographic Details
Published in:Environmental science and pollution research international 2020-10, Vol.27 (30), p.37963-37976
Main Authors: Essoung, Flaure Rosette Ehawa, Tadjong, Alain Tcho, Chhabra, Sumesh Chander, Mohamed, Samira Abuelgasim, Hassanali, Ahmed
Format: Article
Language:English
Subjects:
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Camphor
Cineole
Constituents
Earth and Environmental Science
Ecological effects
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Essential oils
Eugenol
Insecticides
Insects
Methyl eugenol
Ocimum gratissimum
Ocimum kilimandscharicum
Oils & fats
Pests
Research Article
Tomatoes
Toxicity
Tuta absoluta
Waste Water Technology
Water Management
Water Pollution Control
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Summary:Tuta absoluta Meyrick originates in South America and is now one of the most important insect pests of Solanaceae in different parts of the world, including Africa. Its control has relied primarily on chemical insecticides, which are associated with negative ecological effects. In the present study, essential oils of Ocimum gratissimum and O. kilimandscharicum were tested for repellence and fumigant toxicity on the adult stages under laboratory conditions. The oil of O. gratissimum was more repellent, but its toxicity was comparable with that of O. kilimandscharicum . The major constituents of O. gratissimum were methyl eugenol (39.5%) and eugenol (29.7%). Those of O. kilimandscharicum were camphor (47.1%) and 1.8-cineole (19.3%). Eugenol (LC 50 of 0.24 μl/ml, 83.3%, RI 50  = 0.15) and camphor (LC 50 of 0.23 μl/ml, 89.5%, RI 50  = 0.13) were more toxic (at 1 μl/ml for 24 h) and repellent than the other constituents. The results show potential of the essential oils for use in integrated management of the tomato pest.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-020-09773-2