0000000000458213
AUTHOR
A. De Cristofaro
Biological activity of metabolites extracted from Citrus spp. on Ceratitis capitata (Wiedemann) (Diptera: Tephritidae)
The Mediterranean fruit fly (medfly), Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), is one of the most injurious pest at global level. During the last years, several electrophysiological and behavioural studies have been carried out in order to investigate plant volatile compound-insect interactions with the aim to use this knowledge in sustainable control techniques. It has been observed that lemons are not attacked by medfly, probably because of the peel oil, that is toxic to other fruit flies. In the present paper electrophysiological recordings were conducted to evaluate the insect sensitivity to peel extract and peel oil of two Sicilian cultivars (Interdonato and Lunario) of C…
Electrophysiological and Behavioral Responses of Oriental Fruit Moth to the Monoterpenoid Citral Alone and in Combination With Sex Pheromone
The monoterpenoid citral synergized the electroantennogram (EAG) response of male Grapholita molesta (Busck) antennae to its main pheromone compound Z8-12:OAc. The response to a 10-μg pheromone stimulus increased by 32, 45, 54, 71 and 94% with the addition of 0.1, 1, 10, 100 and 1,000 μg of citral, respectively. There was no detectable response to 0.1, 1, or 10 μg of citral; the response to 100 and 1,000 μg of citral was 31 and 79% of the response to 10 μg of Z8-12:OAc. In a flight tunnel, citral affected the mate-seeking behavior of males. There was a 66% reduction in the number of males orientating by flight to a virgin calling female when citral was emitted at 1,000 ng/min ≍1 cm downwind…
Studio dell'attività biologica di metaboliti di Citrus spp. su Ceratitis capitata
La mosca mediterranea della frutta, Ceratitis capitata (Wiedemann) (Diptera Tephritidae) è uno degli insetti maggiormente dannosi a livello mondiale. In anni recenti sono state condotte numerose ricerche sui semiochimici coinvolti nelle interazioni insetto-pianta ospite, avvalendosi di studi elettrofisiologici e comportamentali, con lo scopo di utilizzare le sostanze biologicamente attive eventualmente identificate in strategie di controllo innovative e sostenibili. È noto che i limoni non sono attaccati da C. capitata, molto probabilmente a causa degli oli essenziali dell’epicarpo, tossici per altre mosche della frutta. Nel presente lavoro sono state effettuate registrazioni elettrofisiolo…
Sensory adaptation of antennae and sex pheromone-mediated flight behavior in male oriental fruit moths (Leptidoptera: Tortricidae) after prolonged exposure to single and tertiary blends of synthetic sex pheromone.
Sensory adaptation has been measured in the antennae of male Grapholita molesta (Busck) after 15 min of exposure to its main pheromone compound (Z)-8-dodecen-1-yl acetate (Z8-12:OAc) at the aerial concentration of 1 ng/m(3) measured in orchards treated with pheromone for mating disruption. Exposing males to this aerial concentration of Z8-12:OAc for 15 min, however, had only a small effect on their ability to orientate by flight to virgin calling females in a flight tunnel. Experiments were undertaken to determine if exposure to the main pheromone compound in combination with the two biologically active minor compounds of this species, (E)-8-dodecen-1-yl acetate (E8-12:OAc) and (Z)-8-dodece…