To test the effect of the alcohol content in the pheromone mating disruption (MD) dispenser for Lobesia botrana, a field experiment was set-up in an organic vineyard in the Chianti district (Tuscany, Italy). Three kinds of Isonet (Shin-Etsu) dispensers containing different concentration of E7,Z9-12OH in the synthetic blend were used (~0.5%, ~2%, ~5%). An untreated vineyard with similar agronomic characteristics was examined as control plot. No male captures were obtained in the pheromone traps exposed in MD treated plots. Dissection of tethered females exposed for two consecutive nights during the second flight highlighted the absence of mating in the pheromone treated plots and a mating rate of about 42% in the control vineyard. Cluster infestation assessment showed in each generation a substantial difference between control and pheromone treated vineyards. As for the third generation, higher alcohol dispensers allowed a significant reduction of the infestation in terms of infested clusters and, overall, injured berries in comparison with plots covered with lower alcohol dispensers as well.
Effect of alcohol component E7,Z9-12OH in the mating disruption of Lobesia botrana (Den. & Schiff.) (Lepidoptera: Tortricidae)
LUCCHI, ANDREA;
2012-01-01
Abstract
To test the effect of the alcohol content in the pheromone mating disruption (MD) dispenser for Lobesia botrana, a field experiment was set-up in an organic vineyard in the Chianti district (Tuscany, Italy). Three kinds of Isonet (Shin-Etsu) dispensers containing different concentration of E7,Z9-12OH in the synthetic blend were used (~0.5%, ~2%, ~5%). An untreated vineyard with similar agronomic characteristics was examined as control plot. No male captures were obtained in the pheromone traps exposed in MD treated plots. Dissection of tethered females exposed for two consecutive nights during the second flight highlighted the absence of mating in the pheromone treated plots and a mating rate of about 42% in the control vineyard. Cluster infestation assessment showed in each generation a substantial difference between control and pheromone treated vineyards. As for the third generation, higher alcohol dispensers allowed a significant reduction of the infestation in terms of infested clusters and, overall, injured berries in comparison with plots covered with lower alcohol dispensers as well.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
