| In order to study the bioactivities of Citrus maxima peel ethanol extracts against the larvaes of Dioryctria splendidella, antifeedant activities, growth and development and contact toxicity of D. splendidella larvaes were determined after treated with the extracts. Theresults showed that when the concentration of extracts was 100 mg/mL, the corresponding antifeedant rate reached 99.28% and 94.23% after treatment at 24 hours and 48 hours, and the AFC50 values were 7.61 mg/mL, 9.28 mg/mL, respectively. The inhibition effect on the 4th instar larvaes was 96.32%, 95.44% and 93.19% after treatment of 100 mg/mL at 24 hours, 48 hours and 96 hours, respectively. The corrected mortality of the 3th instar and 5th instar larvae were 90.00% and 80.00%, and the effects were the same as the pesticides thiacloprid. The contact toxicity of the extracts against the 3th instar was higher than that against the 5th instar, with respective LD50 value of 18.46 and 25.99mg/mL. Thus the C. maxima peel extracts had some bioactivities against the larvae of D. splendidella. |
