Male pheromone production and female reproduction of R.pedestris were evaluated on two different kinds of foods; sweet (non-astringent) persimmon and soybean. Male adults fed on soybean produced all the four pheromone components, (E)-2-hexenyl (Z)-3-hexenoate, (E)-2-hexenyl (E)-2-hexenoate, tetradecyl isobutyrate (C14iBu), octadecyl isobutyrate (C18iBu), whereas those fed on sweet persimmon did not produce C14iBu which is a key component in the function of the pheromone, and C18iBu. Female adults fed on soybean produced eggs, however, those fed on sweet persimmon did not at all. From these results, we concluded that host resource greatly affects the chemical communication and reproduction of both male and female of R.pedestris, and that sweet persimmon is not a proper food for its completion of life cycle.