Synergism of pheromone and host-plant volatile blends in the attraction of Grapholita molesta males
MetadataShow full item record
Control of Grapholita molesta (Busck) (Lepidoptera: Tortricidae), a major pest of stone and pome fruits, is successfully achieved by mating disruption. Under these conditions, tools other than conventional pheromone dispensers are needed for flight monitoring. The objective of the present work was to determine whether plant volatiles synergizemale G. molesta attraction to a suboptimal dose of synthetic sex pheromone. The plant blend (referred to as 5VB), a mixture of three green leaf volatiles [(Z)-3-hexenyl acetate, (Z)-3-hexenol, and (E)-2-hexenal] and two aromatics [benzaldehyde (BZA) and benzonitrile (BZN)], was added to the suboptimal pheromone dose (2 ng on filter paper) in log steps (up to 10 000 x the pheromone dose) to test synergism of pheromone and plant blends. In addition, the effect of individual plant volatiles on male responses was investigated by adding to the suboptimal pheromone dose each of the four-compound plant-volatile blends, resulting from eliminating one volatile from the 5VB at a time, or each plant volatile alone. Flight behaviour and the time to reach the source were recorded. The 5VB alone was not attractive to G. molesta males, but at a ratio of 1: 1 000 (Ph:5VB) or higher, the attractiveness of the suboptimal pheromone dose increased, to a level similar to that of the optimal pheromone dose (10 ng). All tested plant volatiles, except BZA, synergized the response to the pheromone when added individually, but only (Z)-3-hexenol and BZN did so to a level not significantly different from the Ph: 5VB blend. Aromatics had a stronger effect than green leaf volatiles (GLVs), because their removal, but not the removal of GLVs, decreased landing responses. The addition of the 5VB decreased significantly the time males needed to reach the odour source. The observed enhanced male attraction to mixtures of pheromone and plant volatiles will facilitate the development of lures for G. molesta adult flight monitoring.
Is part ofEntomologia Experimentalis et Applicata, 2011, vol. 141, núm. 2, p. 114-122
European research projects
Showing items related by title, author, creator and subject.
Ordinary glomeruli in the antennal lobe of male and female tortricid moth Grapholita molesta (Busck) (Lepidoptera: Tortricidae) process sex pheromone and host-plant volatiles Varela, Nelia; Avilla Hernández, Jesús; Gemeno Marín, César; Anton, Sylvia (Company of Biologists Ltd., 2011-02)Both sexes of Grapholita molesta, a key pest of stone fruits, are able to detect host-plant volatiles and the sex pheromone emitted by females, and to modify their behaviour accordingly. How olfactory information is processed ...
Role of plant volatiles and hetero-specific pheromone components in the wind tunnel response of male Grapholita molesta (Lepidoptera: Tortricidae) to modified sex pheromone blends Ammagarahalli Munishamappa, Byrappa; Chianella, Lucia; Gomes, Pedro; Gemeno Marín, César (Cambridge University Press, 2017-02-27)Female Grapholita molesta (Busck) release a pheromone blend composed of two stereoisomeric acetates (Z8-12:Ac and E8-12:Ac), which in a 100:6 ratio stimulate maximum conspecific male approach. Z8-12:OH is described as a ...
Role of plant volatiles and hetero-specific pheromone components in the wind tunnel response of male Grapholita molesta (Lepidoptera: Tortricidae) to modified sex pheromone blends [Research data] Ammagarahalli Munishamappa, Byrappa; Chianella, Lucia; Gomes, Pedro; Gemeno Marín, César (Universitat de Lleida, 2016-07-21)The response of males of the moth Grapholita molesta to sex pheromone and plant volatiles was tested under laboratory conditions in a wind tunnel. Plant volatiles did not restore low responses to a high concentration ...