Abstract

Aphids are pests of agricultural crops and vectors of phytopathogenic viruses. At the same time they make up a very important component of biodiversity; for example, in Moldova only 9% of aphid species are pests. The trophic reactions of aphids related to selection and use of the host plants are far from being well-known. This paper presents an attempt at classification of the aphid host plants, based on analysis of the published data and those obtained by the authors in their studies in Leningrad Province of Russia and in the Republic of Moldova focused on the specific traits of epigenesis and population structure as well as the behavior, feeding, and reproduction of the aphids. The plants are classified by the degree of preference shown by the aphids.

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