Population abundance of flea beetle Phyllotreta sp. in organic farm
2011
Muahmad, R. | Nor Ahya, M., Universiti Putra Malaysia, 43400 Serdang, Selangor (Malaysia). Dept. of Plant Protection
An experiment was conducted to study the species occurrence of flea beetle Phyllotreta sp. population abundance and its relationship with climatic factors in organic farming. Two slots of 12m x 10m with five rows each planted with Brassica sp. were chosen as study plots. Sampling was done for two cultivation periods from 20th February 2009 until 27th March 2009 (Plot 1) followed by 26th April 2009 until 30th May 2009 (Plot 2), using yellow sticky traps and sweep net as sampling methods. The traps were arranged randomly while sweeping net was done weekly. Data regarding temperature and rainfall distribution from Department of Meteorology Malaysia have been used. All collected samples were counted individually and recorded. Correlation and multiple regression (stepwise selection) analysis were done using Statistical Analysis System (SAS) program to determine the relationship of weather parameters (temperature and rainfall), and numbers of Phyllotreta sp. Results showed three species of flea beetles occurred in the farm which includes P. cruciferae, P. albionica and P. striolata; with P. cruciferae giving the highest number for both plots. In Plot 1, there was no correlation for all three species with any parameter, while for Plot 2, only P. cruciferae showed correlation with days and rainfall. The regression analysis (stepwise selection) had detected rainfall as the independent variable that influenced the number performance of P. cruciferae by 83% (R2 = 0.8362).
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