When the seedlings have grown(about 5-7 days after sowing) and the roots are entangled in the gauze, the mats can be transferred into a rearing cage. Fifty adult insects are introduced for oviposition and removed after 1 day. The cage can be in verted and another seedling mat put into the cage as nymphs emerge. A seedling mat can accommodate about 1,000 late-instar nymphs.