Genetic Diversity in Relation to Host Specificity of Aphid Parasitoids (Hymenoptera: Aphidiidae)
Nemec, Vaclav; Stary, Petr
Electrophoretic methods (analysis of isoesterases) were used to determine the impact of host species alternation on infraspecific populations of parasitoids. Polymorphic, oligomorphic and monomorphic parasitoid material was compared. Electromorphs were found to be strictly sex-differentiated but independent of the host species; however, changes in their number and/or frequency in a target population occurred in the case of host species alternation. The present results are used for a new definition and interpretation of biotype and strain (in parasitoids). The information obtained is discussed in relation to pest management programmes. The need of complementing the IPM by research on infraspecific population differences is confirmed.