. One of the major difficulties in the biological control
of insect pest is that
(a) the method is less effective as compared with
the use of insecticides
(b) the practical difficulty of introducing the
predator to specific areas
(c) the predator develops a preference to other diets
and may itself become a pest
(d) the predator does not always survive when
transferred to a new environment.
of insect pest is that
(a) the method is less effective as compared with
the use of insecticides
(b) the practical difficulty of introducing the
predator to specific areas
(c) the predator develops a preference to other diets
and may itself become a pest
(d) the predator does not always survive when
transferred to a new environment.