Evaluation of trap shape and pheromone dispensers in capturing Male Tortrix viridana (Lep.: Tortricidae)

Document Type : Pest Management

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Abstract

Sex pheromone is known as an important tool for monitoring and control of
Tortrix viridana L. (Lep.: Tortricidae). In this regard, trap shape and pheromone dispensers could play important role in successful programs. In this study the shape of pheromone traps including delta, cylindrical, rectangular and wing traps examined as a probable effective factor in capturing of T. viridana in west Azarbaijan, Kurdistan and Fars provinces. Experiments were conducted in randomized block designs with four treatments and four replicates (each replicate contained 2-3 traps). Traps were installed on middle height canopy of oak trees, following first emergence of males. Captured males were counted every 10-15 days. Same experiment was designed for studying the effect of pheromone dispensers on tortrix male capturing with 6 type of dispensers in Azarbaijan forest. All of conditions were same as previous experiment.
Maximum capture was observed in Azarbaijan province by delta traps (mean =110.66 ± 5.2). Whereas, in Kurdistan maximum captured moth was observed in cylindrical traps (59.1±9.95) placed in same group with delta and rectangular traps. In Fars province with low density of pest population cylindrical traps had maximum rate of moth capture (15±2.5) however, there was no significant differences between traps in these regions. Results indicated that in high and medium population density of the pest, trap shape had effective role in male capture. Results obtained in experiments showed that pheromone dispensers have an important role in capturing rate of T. viridana. Maximum captures observed in dispensers made of soft silicon (mean 114 ±24.2 males per trap) and soft rubber with one ostiole (mean =322.7 ± 13.36) compared to the other traps

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