L'impiego delle trappole a feromoni nella previsione delle infestazioni di Tortrix viridana L. (Lep. Tortricidae)

The use of pheromone traps to predict Tortrix viridana L. (Lep. Tortricidae) infestations - For ten years in Tuscany and in the last five years in Sardinia, studies have been conducted on the use of pheromone traps to monitor populations of Tortrix viridana L. Observations were carried out in the Chianti region around Florence in woods of Quercus pubescens Willd. and Q. cerris L. and in three Q. pubescens woods in central Sardinia. In each monitoring site, 3 traps of the "traptest" type baited with synthetic pheromone of the species were set up and egg cluster abundance was later estimated. Analysis of the data revealed a good correlation between mean captures per trap and the mean number of egg cluster per branch: Y = 0.022·X - 0.261 (r2 = 0.65) for Tuscany and Y = 0.212·X + 2.320 (r2 = 0.60) for Sardinia. Capture data also provided reliable information about the pest population trend, showing the beginning of the outbreak phase. The results indicate that pheromone traps could be used to realize permanent monitoring grids for the green oak leaf-roller moth populations. Key words: