Abstract
The effects of the red-colored insect nets against Thrips tabaci Lindeman and T. nigropilosus Uzel were investigated in commercial carrot greenhouses, in Kyoto Prefecture. The degree of leaf damage caused by the thrips and their population density in the greenhouse with the red-colored insect net were lower than those with the white-colored insect net in October and November. T. tabaci and T. nigropilosus were primarily found in carrot greenhouses. T. tabaci was predominant among both group; however, the species composition of T. nigropilosus in the red-colored insect net group was higher than that of the control group. The red-colored insect nets were effective against T. tabaci, but the effectiveness against T. nigropilosus was undetermined.
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