Author/Authors :
Zhu، Wei Xiang نويسنده Department of Entomology, China Agricultural University, Beijing, China , , Zhao، Kun نويسنده Department of Entomology, China Agricultural University, Beijing, China , , Chu، Sha Sha نويسنده Department of Entomology, China Agricultural University, Beijing, China , , Liu ، Zhi Long نويسنده Department of Entomology, China Agricultural University, Beijing, China ,
Abstract :
Background: The efficacy of essential oil of Chenopodium ambrosioides flowering aerial parts and its three main active ingredients was evaluated against Blattella germanica male adults.
Methods: Composition of essential oil was determined by GC-MS. Topical application bioassay was used to evaluate contact toxicity of essential oil and three main components. Fumigant toxicity of essential oil and its main com-ponents was measured using a sealed space method.
Results: Twenty-two components were identified in the essential oil and the main components were (Z)-ascaridole (29.7%), isoascaridole (13.0%), ?-cymene (12.7%) and piperitone (5.0%). The essential oil and (Z)-ascaridole, isoascaridole and ?-cymene possessed fumigant toxicity against male German cockroaches with LC50 values of 4.13, 0.55, 2.07 and 6.92 mg/L air, respectively. Topical application bioassay showed that all the three compounds were toxic to male German cockroaches and (Z)-ascaridole was the strongest with a LD50 value of 22.02 ?g/adult while the crude oil with a LD50 value of 67.46 ?g/adult.
Conclusion: The essential oil from Chinese C. ambrosioides and its three main active ingredients may be explored as natural potential insecticides in the control of cockroaches.
