2005 年 2005 巻 52 号 p. 83-88
The effects of temperature on the flight activity and dispersal of the American serpentine leafminer, Liriomyza trifolii (Burgess) were evaluated by laboratory experiments and release experiment of adults in a greenhouse. In the laboratory experiments, catch rates of L. trifolii adults by yellow sticky traps at the conditions of 15, 20, 25, and 30°C increased with temperature, and catch rates at 15°C hardly increased with time after release. Catch rates of females were repressed when a host leaf was given with the adults compared to non-leaf conditions, however, the catch rates of males were not affected by a host leaf. L. trifolii adults were released in the center of a greenhouse in both spring season when daily average temperatures were about 15°C, and summer season when daily temperatures were 30°C. The numbers of the adults on each host plant pot arrayed in a lattice on the greenhouse ground were counted during six days after release, and distribution and spatial pattern of the adults were investigated by aggregation index of CA and the distance from release point to host plants. In the spring season experiment, the adults and eggs oviposited indicated aggregated distribution, and in the summer season it indicated uniform distribution. These results suggested that temperature in a greenhouse affects dispersal and spatial pattern of L. trifolii.