Abstract
Abstract
Background
Fumes from high-temperature heated plant leaves containing volatile phytochemicals generated from Lantana camara, Cinnamomum zeylanicum, Azadirachta indica and Ocimum sanctum were tested for their insecticidal activity against adult southern cowpea weevil (Callosobruchus chinensis L.) and their F1 progeny production/emergence. Volatile phytochemicals containing fume was generated using a flameless dry heat extraction method similar to pyrolysis combustion without air supplement at 180 ± 5 °C. Insect mortalities were assessed up to 72 h after exposure to the different treatments of fumigation by plant-fume and control.
Results
All volatile plant-fume samples contained average of 16.3 ± 1.5% O2 and 5.8 ± 0.5% CO2 in the test jars. The F1 progeny emergence was estimated 30 days after treatment. After 36 h of exposure, L. camara showed the highest toxicity against C. chinensis, followed by O. sanctum, A. indica and C. zeylanicum, with LT50 values of 7.3, 9.4, 14.7 and 20.6 h, respectively. The volatile phytochemical containing plant-fume generated by A. indica and C. zeylanicum produced LT99 values that were not significantly different (P > 0.05) from each other. The F1 adult emergence from treated mungbean (Vigna radiata L.) samples was significantly inhibited by L. camara and A. indica volatile plant-fume compared to C. zeylanicum fume. However, plant-fume generated from all four plants exhibited effective direct toxicity and F1 progeny inhibition of more than 86%.
Conclusion
From the study, it can be concluded that volatile plant-fume treatment was highly lethal to C. chinensis and significantly reduced F1 progeny emergence. Therefore, phytochemicals obtained from thermal extraction technique can be used as an alternative technique to chemical fumigation of stored mungbean.
Publisher
Springer Science and Business Media LLC
Subject
Agronomy and Crop Science,Biochemistry,Food Science,Biotechnology
Reference29 articles.
1. Adikarinayake TB, Palipane KB, Müller J. Quality changes and mass loss of paddy during airtight storage in a ferro-cement bin in Sri Lanka. J Stored Prod Res. 2006;42:377–90.
2. Prasantha BDR, Prasadi VPN,Wimalasiri KMS. Effect of hermetic storage on end-use quality of mungbean, In: Arthur FH, Kengkanpanich R, Chayaprasert W, Suthisut D, editors. Proceedings of the 11th International working conference on stored product protection, Chiang Mai, Thailand; 2014. p. 373–84.
3. Kawuki RS, Agona A, Nampala P, Adipala E. A comparison of effectiveness of plant-based and synthetic insecticides in the field management of pod and storage pests of cowpea. Crop Protect. 2005;24:473–8.
4. Appleby JH, Credland PF. Environmental conditions affect the response of west African Callosobruchus maculatus (Coleoptera: Bruchidae) populations to susceptible and resistant cowpeas. J Stored Prod Res. 2004;40:269–87.
5. Donahaye EJ. Current status of non-residual control methods against stored product pests. Crop Protect. 2000;19:571–6.