Semiochemicals from Lobesia botrana (Lepidoptera: Tortricidae) eggs deter oviposition by the codling moth Cydia pomonella (Lepidoptera: Tortricidae)

摘要: The intention of this study was to falsify a hypothesis interspecific avoidance semiochemicals from egges by ovipositing tortricid females. oviposition responses Cydia pomonella (L.) females apples baited with blends identified in another species, Lobesia botrana (Den. et Schiff.) were investigated. Experiments conducted binary choice tests using natural substrates (apples). In each experimental arena, 4 mated offered 16 (8 treated and 8 untreated) the number compared. Females avoid on blend nine components characteristic methanolic extracts L. eggs (fatty acids esters) (complete blend), as well palmitic acid methyl palmitate (binary blend). Oviposition already observed these two at dose 72 equivalent per apple effect increased dose. three major esters complete (ternary blend) did not provoke significant avoidance. control, only 8.3% bore no egges, percentage (720 eggs) respectively up 37.5% 26.4%, but 18.1% ternary blend. Complete used high strongly reduced mean eggs/apple fruits (1.6 ± 1.8; 9 compounds) (1.8 2.2; 2 against 4.6 4.0 control. This reduction 3 esters. It is concluded that, present results, compounds associated are avoided C. Esters alone cannot explain such an avoidance, may partly cause response.