Invasive Species Compendium

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Abstract

Effect of trap color and position on the trapping efficacy of Tuta absoluta.

Abstract

Background: The tomato leafminer Tuta absoluta, originates in Peru, the western South America, is a newly invaded important agricultural pest in China and has posed a potential threat to safety production of agriculture in China. Objective: To provide a basis for effectively managing the occurrence and damage caused by this insect pest, the trapping efficacy of color and height of placement of sex pheromone traps (planar traps) on T. absoluta was evaluated. Method: The sex pheromone lures target to T. absoluta were used and the techniques and methods of behavioral ecology were applied. The field tests were conducted in greenhouses for organic vegetable production. Result: The four colors of sex pheromone traps were effective in trapping T. absoluta. On average, the total numbers of trapped adults per trap were 2 548.3 males by blue (wavelength, (465±10) nm) trap, 2 065.8 males by yellow ((575±10) nm) trap, 1 998.3 males by green ((520±10) nm) trap, and 1 072.7 males by white trap during the whole period (61 d) of field trapping tests. The daily proportions of trapped adults by the blue and yellow traps were the highest, and then followed by the green trap, that of the white trap was the lowest. The daily number of trapped T. absoluta adults by the blue trap was the most, and then followed by the yellow and green traps, that of the white trap was the least. The trapping stability of white trap was significantly higher than that of the other three trap colors. Comprehensive evaluation, based on above three indexes, showed that the trapping efficacy of the blue trap to T. absoluta adults was the highest, and then followed by that of the green and yellow traps, that of the white trap was the lowest. The numbers of trapped adults per sex pheromone trap were 332.2 males by the height of 0 cm (place the traps on the ground directly), 94.2 males by 0-20 cm, 12.4 males by 60-80 cm, 9.2 males by 120-140, and 7.4 males by 180-200 cm on average during the whole period (37 d) of field trapping tests. The proportion of trapped adults by the trap height of 0 cm was the highest, and then followed by the 0-20 cm, those of the 60-80, 120-140, and 180-200 cm were the lowest. The daily number of trapped T. absoluta adults by the trap height 0 cm was the most, and then followed by the 0-20 cm, those of the 60-80, 120-140, and 180-200 cm were the least. Significant difference was detected among the five trap heights when the trapping stability was compared. Comprehensive evaluation, based on above three indexes, showed that the trapping efficacy of the trap height 0 cm to T. absoluta adults was the highest, and then followed by that of the 0-20 cm, the next was the 60-80 cm, those of the 120-140 cm and 180-200 cm were the lowest. Conclusion: Analyses based on the integrated indexes of color and height of placement of sex pheromone traps (planar traps) showed that blue traps placed on the ground directly could get the best trapping efficacy.