Abstract
The effects of a 4-mm mesh net on the occurrence of pests and diseases, the agrometeorological environments and the growth of cabbage were investigated in open field. The number of large lepidopterous pests such as common cabbage worm, cabbage armyworm and corn earworm in the site covered by a net was smaller than the number in the site without a net. On the other hand, the numbers of aphids and leaf beetles in the site covered by a net were larger than the numbers in the site without a net. The temperature in the site covered by a net was slightly higher than that in the site without a net. The amount of harvested cabbages in the site covered by a net was larger than that in the site without a net in the early season.
