Rearing on cut foliage
This technique is useful for external leaf feeders but
not leaf-miners or most sucking bugs. Its main advantage is to exploit
locally growing infestations of the weed and reduce the need for host
plant propagation. Cut foliage is brought from the field. The stems must
be placed in fresh water or a nutrient solution in suitable containers. It
may be necessary to seal around the stems to prevent insects drowning in
the liquid. Cut foliage may stay fresh for a few days before being
replaced. One disadvantage is the risk of injury to insects through
excessive handling during transfer to new foliage.
Rearing on cut flowers
Rearing on cut flowers will probably be the best option
for flower feeding insects. Flower feeding insects may need a greater
supply of flowers than can be supplied on potted plants. Many perennial
plants do not flower readily when grown in pots. Some perennials which are
not readily propagated vegetatively take several years to produce flowers.
Cut flowers are handled in a similar manner to cut foliage.
