Abstract
Body size. host preference, mate preference and the effects of inter-strain mating on fertility were compared between two syrnpatric “strains” of Indonesian Epilachna vigintioctopunctata, one on selanaeeeus plants and the other on the leguminous weed Centrosema pubescens. The two strains were different in body size and host preference, but seemed to lack effective reproductive barriers except host fidelity.
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