Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract Full Text

Light trap density for capturing the tomato leafminer moth "Tuta absoluta" in greenhouses.


This paper presents the results of the use of light traps for capturing the tomato leaf miner moth (Tuta absoluta) in greenhouses. Cylindrical transparent containers (8.5 cm diameter and 15 cm height), which were made from clear plastic (polyethylene terephthalate (PET)) were chosen as traps. For entering the attracted moths, several holes (0.5 cm in diameter) were embedded in the traps walls, except the below part (2.5 cm) that some 0.5% detergent solution were poured in there to entrap the captured moths. Then a BLB bulb was installed in each trap as light sources. The traps were installed at about 70 cm above the infested plants, with four different density (2, 4, 6 and 8 in a 1000 m2 of greenhouses) to find out the best density of traps. In the greenhouse assessment in Hormozgan province, the mean numbers of moths were 27.75 in the two-trap and 14.39 in the four-trap, while for the four-trap were 11.67 compare to the six- traps 7.87, and finally for the six-trap were 112.67 compare to the eight-trap 113.33. In Qazvin province, the average numbers of moths were 10.93 in the two-trap compare to 13.61 for the four traps, while, the number of moths for the four-trap were 11.38 and for the six-trap were 11.91. In the Markazi province (Greenhouse complex of Aveh), the mean numbers of moths were 27.70 for the two-trap treatment and 18.95 for the four-trap treatment. In the second step, the mean numbers of moths were 8.25 in the four-trap compare to 9.47 for the six-traps. Mass tapping is an approach of pest control methods in several crops. This technique is non-poisonous and non-hazardous to natural enemies as a part of the integrated pest control program, and environmentally friendly. The light traps can captured not only males, but also a large number of females. Therefore, light traps are more effective than conventional pheromone-baited water traps in reducing the damage especially at low/moderate T. absoluta population density.