Abstract
Adult males and females of Helicoverpa armigera could not go through the 4-mm mesh net on the laboratory experiment. Then, the suppressing effect of a 4-mm mesh net on the occurrence of H. armigera was investigated in a green pepper field. The number of adult males attracted to sex pheromone traps in the site covered by a net was less than those in the site without a net. In addition, the number of green pepper fruits injured by larvae in the site covered by a net was less than those in the site without a net. Accordingly, a 4-mm mesh net was effective in suppressing the occurrence of H. armigera in a green pepper field.
