Abstract
Toxicity of various essential oils and their volatile constituents towards the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae), was determined. The most potent toxicity was found in essential oil from eucalyptus (LD50 = 28.9 μl/l air). GC-MS analysis of essential oil from eucalyptus showed it to be rich in 1,8-cineole (81.1%), limonene (7.6%) and α-pinene (4.0%). Treatment of S. oryzae with each of these terpenes showed 1,8-cineole to be most active (LD50=23.5 μl/l air). In addition to 1,8-cineole, benzaldehyde (LD50 = 8.65 μl/l air) occurring in peach and almond kernels had a potent fumigant toxicity towards the rice weevils. Therefore, benzaldehyde and other natural volatiles could be a safer fumigant to control stored-grain insect pests than those currently used.
| Original language | English |
|---|---|
| Pages (from-to) | 317-320 |
| Number of pages | 4 |
| Journal | Crop Protection |
| Volume | 20 |
| Issue number | 4 |
| DOIs | |
| State | Published - 2001 |
Keywords
- 1,8-cineole
- Benzaldehyde
- Essential oils
- Eucalyptus
- Fumigant toxicity
- Sitophilus oryzae
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