The Fumigant Toxicity of Syzygium aromaticum and Cymbopogon citratus Oils on Selected Life Stages of Tribolium castaneum (Coleoptera: Tenebrionidae)

Jordan Journal of Biological Sciences

Olufunmilayo E. Ajayi¹ 

关键词: Fumigant toxicity;    Tribolium castaneum;    amylase activity;    Syzygium aromaticum;    Cymbopogon citratus;    biopesticide.;   

DOI  :  

学科分类：生物科学（综合）

来源: Hashemite University, Deanship of Research and Higher Studies

【 摘 要 】

In efforts to compliment research on biopesticides, attempts were made to determine the fumigant toxicity of essential oils from Syzygium aromaticum and Cymbopogon citratus against Tribolium castaneum larvae and adults under laboratory conditions. Four dosages (0, 50, 100 and 150μL/L) of each oil were applied in four replications. One-hundred larvae and unsexed adult populations of T castaneum were thus subjected to the oils in fumigant bioassays. α and β amylases activities in the fumigated life stages of T. castaneum were accessed. Toxicity data was subjected to One-way Analysis of Variance. Also, the relationship between the dosages of the S. aromaticum and C. citratus oils and the mortality rate among T. castaneum was investigated using regression analysis. Mortality rate was directly proportional to the dosages of both oils. The inhibitory potential of the oils, however, was only observed at the highest dose (150μl/L) for the adult stage, where low amylase activity was recorded. On the whole, amylase activity was higher in the insect stages fumigated with S. aromaticum oil. Similarly, significant positive linear correlation exists only between the mortality rate and the dosages of S. aromaticum oil (r= 0.994, N = 4, P = 0.006). The results gave cues on the action of the essential oils via some stress-related physiological activities in the insect stages that culminated in the killing of the insects.

【 授权许可】

CC BY