The antixenosis values of Rathu Heenati and 02428
were 3.5 and 6.8, respectively. In the F2 population, the
values of antixenosis showed a continuous range of 2.9 to
10.2 in the distribution curve (Fig. 1b). A continuous segregation
was also observed in BC1 population with a range
of insect number from 3.4 to 10.7 and a valley of 6.0 in
the distribution curve (Fig. 2b). Both of the normal distribution
of antixenosis values indicated that minor genes
governed antixenosis resistance.