Abstract
The efficiency of light trap catches for monitoring the overwintering generation of the rice leaf bug, Trigonotylus caelestialium (Kirkaldy), was evaluated. Adult emergence was surveyed four ways in Joetsu (37°06′N, 138°16′E), Niigata Prefecture in 2000 and 2001. The date of the first catch in the light trap was well synchronized with the results of sweeping in the levees, rearing experiment under natural conditions and water pan trap baited with conspecific females, for each year. The light trap catches remarkably reflected the difference in the timing of adult emergence between the two years, which would be caused by yearly fluctuations in the spring temperature. Thus the light trap appears to be useful for monitoring the adult emergence of the overwintering generation.
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