| Brown planthopper (BPH), Nilaparvata lugens (Stål), is a major insect pest of rice in Thailand.Because of their ability to adapt to host plant and environment, the BPH becomes an extremely destructive pest and difficult to control. The purpose of this research is to monitor the insecticide resistance of BPH in North Eastern (NE) Thailand. The BPH populations were collected from the outbreak areas in 9provinces during 2011 to 2012. The toxicity (LD50) of 10 insecticides was conducted using Topical bioassay method. The results showed that the BPH populations from 7 provinces were resistant to ethiprole and isoprocarb. The NongBua Lam Phu population was the widest spectrum of resistance to the tested insecticides,whereas, the BPH population from Sisaket was... |
