Journal of Science, T. 7, S. 2 (2017)

Cỡ chữ:  Nhỏ  Vừa  Lớn

Bioefficacy of leaf extracts from pouzolzia zeylanica (L.) Benn Against diamondback moth plutella xylostella in Viet Nam

NGUYEN NGOC BAO CHAU, LE THI MINH HIEN, DANG THI TINH, NGUYEN BAO QUOC

Tóm tắt


    In Viet Nam, Pouzolzia zeylanica (L.) Benn is a native plant and has been demonstrated its applicability as a medical plant. Additionally, Pouzolzia zeylanica was used to control fly larvae during food processing due to insecticidal activity. We optimized the extraction of Pouzolzia zeylanica by ethanol at different conditions: concentration, the ratio of solid (material) - liquid (ethanol volume) (mg/ml) and the extraction time (hour). Results indicated that extraction yield was effected by all of the factors. The optimized extraction yield was 6.85% (Y) with ethanol concentration at 96 percent ethanol (Z1), the ratio solid to liquid is 1: 25 (mg/ml) (Z2) and extraction time is 4 days (Z3). We tested the efficiency of leaf extracts from Pouzolzia zeylanica and antifeedant activity against diamondback moth Plutella xylostella at different leaf extract concentrations. Results indicated that 80% mortality induced by those compounds was recorded on Plutella xylostella second instars at 30% leaf extract concentration and had significant difference compared to the control (P=0.0000); the leaf extract affected the ratio of pupation, adult emergence and antifeedant activity of P. xylostella (P=0.0000). The obtained results promise a potential of using Pouzolzia zeylanica as biopesticide in Viet Nam.    

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Journal of Science - Ho Chi Minh City Open University