›› 2007, Vol. 50 ›› Issue (12): 1304-1308.

• RESEARCH PAPERS • Previous Articles     Next Articles

Biological activities of curcuminoids against Tetranychus cinnabarinus Boisduval (Acari: Tetranychidae)

  

  • Online:2007-12-20 Published:2008-01-04

Abstract: The direct contact activities of the curcumin (CCM), demethoxycurcumin (DMC) and bisdemethoxycurcumin (BDMC), isolated from the rhizomes of Curcuma longa, against the adults, nymphs and eggs of Tetranychus cinnabarinus Boisduval and oviposition inhibition against female adult mites were examined under the laboratory condition by slide-dip and leaf-dip method, respectively. The results showed that evaluated with the medium lethal concentration (LC50) values, the biological activities of both contact action and oviposition inhibition of three monomers against T. cinnabarinus were in the tendency of BDMC>DMC>CCM. BDMC showed the highest contact toxicity against adult T. cinnabarinus among the three components, whose LC50 values at 24 h and 48 h were 1.18 mg/mL and 0.51 mg/mL, respectively. The general tendency of contact action against T. cinnabarinus nymph was same as against the adult, and the most toxic component to the nymph was BDMC, whose LC50 at 48 h was 2.48 mg/mL. The contact toxicity of curcuminoids against T. cinnabarinus egg also exhibited the tendency of BDMC>DMC>CCM. All the three components showed certain oviposition inhibition activity against T. cinnabarinus female adults. Through the primary structure-activity relationship analysis of curcuminoids, the attribution of methyloxy to acaricidal activities was determined, which could provide valuable information for developing potential new phytophagous acaricide or lead compound.

Key words: Tetranychus cinnabarinus, curcuminoids, biological activity