| Example populations of brown planthopper outbreak in Phitsanulok province, Bring test the reaction virulence of the rice varieties with different resistance genes. Individual insect separate test showed that BPH samples collected during the years 2010 by the diversity of biological species in a mixed group of BPH into three groups : Group 1 biotype 4 BPH resistance genes were Bph 3, bph 4 and bph 2 + Bph 3 group 2 biotype 5 BPH resistance genes were bph 2 + Bph 3 and group 3 New biotype is resistant gene Bph 3 and bph 2 + Bph 3 as the province of Phitsanulok and Kamphaeng Phet group 1 biotype 4 were 37.50 and 14% in group 2 biotype 5 were 10.42 and 20% and group 3 new biotype were 52.08 and 66%, respectively, that none of the insect population biotype 3.... |
