Discussion
Methods of brown planthopper-resistance evaluation in rice
The indicators honeydew excretion, survival rate, and
emergence rate were applied to detect the level of antibiosis
to BPH in rice varieties. Consequently, BPH-survival
rates varied from 45 to 73% of the rice varieties as measured
by the 6th day in this study. This result fitted well
with that of Du et al. (2009) and Qiu et al. (2010).
However, the studies conducted by Myint et al. (2009)
showed that the survival rates of N. lugens females were
0% on several rice varieties carrying resistance genes.