The effect of atmospheric pheromone concentrations on behavior of lightbrown apple moth in an apple orchard

Citation
Dm. Suckling et al., The effect of atmospheric pheromone concentrations on behavior of lightbrown apple moth in an apple orchard, J CHEM ECOL, 25(9), 1999, pp. 2011-2025
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
25
Issue
9
Year of publication
1999
Pages
2011 - 2025
Database
ISI
SICI code
0098-0331(199909)25:9<2011:TEOAPC>2.0.ZU;2-C
Abstract
A previously validated Lagrangian model was used to estimate the threshold of atmospheric pheromone concentration required to prevent trap catch and w ing fanning in mating disruption plots in an apple orchard. Electroantennog ram (EAG) traces of 10 min duration were recorded, along with supporting me teorological data needed for the model, to better define the conditions in which successful mating disruption will occur. Pheromone was released from polyethylene tubing dispensers into orchard blocks treated with 10, 100, 10 00, and 2000 dispensers/ha. Predicted dusk concentrations of atmospheric ph eromone at a height of 1.85 m varied nightly between 4 and 90 ng pheromone/ m(3) (in plots treated with 1000 dispensers/ha) over ii weeks. Disruption o f traps baited with 100-mu g pheromone lures followed an asymptotic curve w ith predicted concentration, but they did not show a significant effect of trap height (1.5 and 3.0 m). Wing fanning was reduced by increasing the den sity of dispensers, but was not completely eliminated even at 1000 dispense rs/ha. At this density, the concentrations were usually <16 ng pheromone/m( 3). Electroantennogram recordings of 10 min;duration showed a higher freque ncy of pheromone pulses in plots treated with more point sources per hectar e. There was also a positive correlation between the number of pulses recor ded by the EAG and predicted concentration for plots treated with 1000 or 2 000 dispensers/ha. These results give added support to our model of pheromo ne release and transport in treated apple orchards.