Response of female Cydia molesta (Lepidoptera: Tortricidae) to plant derived volatiles.
Peach shoot volatiles were attractive to mated female oriental fruit moth, Cydia molesta (Busck), in a dual choice arena. No preference was observed between leaf odours from the principle host plant, peach, and the secondary host plant, apple. Twenty-two compounds were identified in headspace volatiles of peach shoots using gas chromatography-mass spectrometry. Green leaf volatiles accounted for more than 50% of the total emitted volatiles. A bioassay-assisted fractionation using different sorbent polymers indicated an attractant effect of compounds with a chain length of 6-8 carbon atoms. The major compounds of this fraction were tested either singly or in combinations for behavioural response of females. Significant bioactivity was found for a three-component mixture of (Z)-3-hexen-1-yl acetate, (Z)-3-hexen-1-ol and benzaldehyde in a 4:1:1 ratio. This synthetic mixture elicited a similar attractant effect as the full natural blend from peach shoots as well as the bioactive fraction.
Dorn
S
S
Institute of Plant Sciences Applied Entomology, Swiss Federal Institute of Technology (ETH) Clausiusstrasse 25/NW Zurich CH-8092 Switzerland.
Natale
D
D
Mattiacci
L
L
Hern
A
A
Pasqualini
E
E
Dorn
S
S
D000818:Animals; D001681:Biological Assay / Q000662:veterinary; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D007915:Lepidoptera / Q000502:physiology*; D027845:Malus / Q000737:chemistry* / Q000469:parasitology; D009812:Odorants / Q000032:analysis*; D018520:Plant Shoots / Q000737:chemistry; D027861:Prunus / Q000737:chemistry* / Q000469:parasitology; D014835:Volatilization