In the present study, the susceptibility of four varities of wheat Maxipak 65,
M221×M24, Saberbek and Condoras in addition to the hybrid F4 (from the
hybridization of Maxipak-65 with M221×M24 for four successive generation)
against khapra beetle d
uring storage was estimated. The population growth of
the pest and percentage loss due to pest infestation were taken as criteria for
measuring resistance the against insect. The study indicate that the hybrid F4
was the best in productivity and early in production which are favorable
characters but contrarily it was highest susceptibility toward the insect
infestation. When the insect reared on the hybrid F4, appeared the highest
population density and at the same time the infestation caused in the highest
loss weight percentage. On the other hand the Maxipak-65 variety showed the
lowest population density of the pest and the lowest loss weight percentage due
to infestation than the other varieties and hybrid F4. This result indicates that
resistant character depressed during inbreeding during F4 hybrid production
in compared to parents therefore it must be early consumed to prevent the
infestation by the insect studied.
