BIOLOGICALACTIVITY OF SOME ESSENTIAL OILS AND THEIR COMPONENTS IN RELATION TO OAK BUG LACE CORYTHUCHA ARCUATA SAY (HEMIPTERA : TINGIDAE)

The North American invasive oak bug lace Corythucha arcuata Say has penetrated and spread widely in southern Russia. The insects significantly damage tree crowns, causing chlorosis and early leaf fall. For the city of Krasnodar, this ecological situation threatens with the destruction of common oaks Quercus robur L. At present, data on the chemical communication of this bug species are not available in the literature. It is actual to study this issue through the search for biological remedies against these pests. Quite safe means are compounds found in nature. For the sycamore bug Corythucha ciliata Say a component of the anxiety pheromone is geraniol, which is a widespread component of natural essential oils. Therefore, this paper studied the activity of terpenoids (geraniol, citronellol and (+)-citronellal), their derivatives (alpha-ionon, beta-ionon), natural essential oils (coriander, orange) and a mixture of essential oils of coriander, fennel, dill and chamomile (30 % : 10 % : 10 % : 1 %) in relation to the oak bug lace. At an experimental dosage of 0.5 μl per petri dish, the repellent activity of (+)-citronellal was revealed. It was shown that the hydrocarbon n-hexane and ethyl alcohol have a repellent activity in high concentrations. This property of hexane can explain the absence of invasions among oaks located along highways with heavy traffic. For large concentrations of essential oils of orange and geraniol, a killing effect has been established.