Factors Improving Field Trapping of Male Rice Stem Borer Moth, Chilo suppressalis WALKER (Lepidoptera : Pyralidae), by Using Synthetic Sex Attractant

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Abstract
Factors improving the attractiveness of traps baited with the synthetic sex attractant of C. suppressalis, i.e., Z-11-hexadecenal (HDAL) and Z-13-octadecenal (ODAL), were examined in the field. Rubber septa and polyethylene capsules were good dispensers for loading the chemicals because they retained attractivenss for a long period. The amount of attractant loaded on rubber dispensers was critical. Attraction was shown by dispensers loaded with 0.1-10 mg of the attractant. Two mg was the optimal amount, having caught about 64% of the virgin females. The ratio of the 2 pheromonal components was not critical for attraction. Attractiveness was observed in mixtures ranging from 20:1 to 1:1 (HDAL:ODAL) Among these, 3:1, 5:1 and 7:1 were more attractive than other mixtures.