Chemical control of the horse-chestnut leaf miner Cameraria ohridella is limited to microinjections that injure trees, for air pesticide spraying is not recommended in urban areas. Alternative methods, e.g., the use of antifeedants to control and/or prevent the C. ohridella infestations are searched for. The aim of the present study was to assess the effect of selected aromatic plant extracts and their major terpenoid constituents on the feeding of C. ohridella larvae. We found that an extract of Solidago canadensis was attractant, the extracts of Tanacetum vulgare and Heracleum mantegazzianum were potentially attractant, Pimpinella anisum, Carum carvi, Syzygium aromaticum, Thuja occidentalis, Origanum majorana were inactive, and Thymus vulgaris, Satureja hortensis, Rosmarinus officinalis were potentially deterrent. β-Pinene, geraniol, linalool, and p-cymene were attractant, γ-terpinene and linalool were potentially attractant, h-terpinene, terpinolene, and camphene were inactive, bornyl acetate and α-pinene – potentially deterrent, and thymol was deterrent. Complex plant extracts against C. ohridella larvae are less active than pure compounds. The horse chestnut characteristic saponin β-aescin appeared a feeding stimulant for C. ohridella.
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