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Volatile aldehydes are promising broad-spectrum postharvest insecticides.
D G Hammond1, S Rangel, I Kubo
1Agricultural and Environmental Chemistry Group and Department of Environmental Science, Policy and Management, 201 Wellman Hall, University of California at Berkeley, Berkeley, California 94720-3112, USA. dhammond@altertec.org
Journal of Agricultural and Food Chemistry
|September 20, 2000
Summary
Naturally occurring aldehydes show potent insecticidal activity against aphids and other pests. Three promising fumigants, propanal, (E)-2-pentenal, and 2-methyl-(E)-2-butenal, effectively control insects with minimal phytotoxicity to produce.
Area of Science:
- Agricultural Science
- Entomology
- Food Science
Background:
- Postharvest losses due to insect infestation are significant.
- Current synthetic fumigants face regulatory and resistance challenges.
- Naturally occurring compounds offer potential alternatives for pest control.
Purpose of the Study:
- To evaluate the insecticidal activity of plant-derived aldehydes against postharvest pests.
- To assess the phytotoxicity of promising aldehyde fumigants on various commodities.
- To identify safe and effective natural alternatives for insect control in stored products.
Main Methods:
- Screening of 29 aldehydes for insecticidal activity against aphids on fava bean leaf disks.
- Application of reduced pressure (partial vacuum) to enhance fumigation efficacy.
- Assaying the 11 most effective aldehydes on whole iceberg lettuce heads under reduced pressure.
- Phytotoxicity testing on a range of fruits, vegetables, and grains.
Main Results:
- Reduced pressure fumigation significantly increased insecticidal activity.
- Propanal, (E)-2-pentenal, and 2-methyl-(E)-2-butenal demonstrated high efficacy against aphids.
- These three aldehydes showed minimal to no phytotoxicity on most tested commodities at insecticidal doses.
- Effectiveness was also indicated against mealybugs, thrips, and whiteflies.
Conclusions:
- Propanal, (E)-2-pentenal, and 2-methyl-(E)-2-butenal are effective and safe postharvest insect control agents.
- Natural aldehydes offer a viable, affordable, and environmentally friendlier alternative to synthetic fumigants.
- Further research can explore broader applications and optimization of these natural compounds.