Essential Oils: Useful Tools in Storage-Pest Management

Area of Science:

• Agricultural Science
• Entomology
• Natural Product Chemistry

Background:

• Storage pests pose significant threats to agricultural products, necessitating effective control strategies.
• Synthetic pesticides often have environmental drawbacks, driving research into natural alternatives.
• Essential oils (EOs) are recognized for their potential insecticidal and repellent properties.

Purpose of the Study:

• To evaluate the repellent and mortality effects of two chemical substances (DEET and 2-undecanone) and seven essential oils (EOs).
• To assess the efficacy of selected EOs against key storage pests: Tribolium confusum, Tenebrio molitor, and Acanthoscelides obtectus.
• To determine the potential of EOs as bio-control agents in stored product protection.

Main Methods:

• Exposure of storage pests to various concentrations of DEET, 2-undecanone, and seven EOs (Allium sativum, Artemisia annua, Ocimum basilicum, Lavandula angustifolia, Eucalyptus globulus, Pinus sylvestris, Curcuma longa).
• Utilized olfactometer and mortality tests to record repellent and lethal effects.
• Evaluated effects at 24, 48, and 72 hours post-treatment.

Main Results:

• Allium sativum, Eucalyptus globulus, and Lavandula angustifolia demonstrated significant repellent effects.
• A substantial lethal effect was observed for Allium sativum, Eucalyptus globulus, and Ocimum basilicum.
• Effective EOs retained repellent and mortality effects even at low concentrations, with Allium sativum and Ocimum basilicum being most effective against T. confusum and T. molitor, and Lavandula angustifolia and Curcuma longa showing high activity against A. obtectus.

Conclusions:

• Certain essential oils, particularly Allium sativum, Ocimum basilicum, Lavandula angustifolia, and Curcuma longa, exhibit potent repellent and mortality effects against major storage pests.
• These EOs demonstrate efficacy even when diluted, suggesting cost-effectiveness and reduced environmental impact.
• The studied EOs show promise as viable bio-control agents for integrated pest management strategies in stored product protection.