Tomatoes are one of the most important vegetable crops in Turkey . Th tomato leafminer Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) has recently become a key pest of tomatoes grown in greenhouses or open fields worldwide, including Turkey, Bosnia, Montenegro, and many other countries in Europe. A field survey was conducted to monitor seasonal population fluctuation of T. absoluta adults in field-grown processing tomatoes containing three different cultivars at three locations in Ye isehir town of Bursa, northwestern Turkey in 2011. In each location, which is 2 ha in size, 4 delta type pheromone tr aps baited with 0.5 and 0.8 mg pheromone lures and 2 water pan traps combined with a light sourc e and 0.5 mg pheromone lures were hung on planting stakes at an initial height of 30 cm to monitor moth populat ions. Moth flight activity began on 2 June and continued until 11 October. Moths showed 3 distinct flight peaks during the growing season. The maximum number of moths was recorded in October after harvest. Although more m oths were caught in pheromone traps baited with 0.8 mg pheromone lures compared with those baited with 0.5 mg pheromone traps, there was no statistically significant difference. However, there were significantly fewer moths in water pan traps with a light source than those in pheromone traps. Moth captures varied significantl y among tomato cultivars. The percentage of fruit damage by larvae was evaluated at har vest in September and reached 1.45% despite the insecticide sprays.
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