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rl]he rice stem borer, Chilo szmpressalis (WALKER) is the most serious rice borer in temperate and subtropical Asia In most parts ofJapan, it has two generations a year and the adults emcrgc mainly inJune and August (e.g. MIyAsHri'A, l982), A continuously decreasing trend in infested areas has been observed inJapan since the early 1970's (KiRi'i'ANi, l988), reaching its minimum in 1989 CHIRAI, 1994). Although such a decrease in the population density occurred generally, local outbreaks have been noted sporadically since 1978 (TANAKA ct al., 1981; SuGiuR.A, 1984>. Recently, the population density has tended to re$urge in some regions due to changes in rice variety and the cultural practice (EMuRA, 1994). However, the overall population dcnsity remains to be low. Under such circumstances, the insecticidal control of this pest should be minimized by means of the population monitoring. A preliminary research from this viewpoint has already been conducted since the late 1960's to the 1970's (KoyAMA, 1973, 1975, 1977; KQJIMA and EMuRA, 1981), and it contributed to reduce spraying insecticides at least fbr the

applied entomology and zoology

An Estimation of the Control Threshold of the Rice Stem Borer, Chilo suppressalis (WALKER) (Lepidoptera: Pyralidae) Based on the Pheromone Trap Catches