3. Blistered underside of leaves
Known as rust, this disease is characterized by
orange-red blisters that turn black in fall. It
can survive the winter and will then attack new
sprouts in the spring. Collect and discard
leaves that are infected in fall. a Benomyl or
Funginex spray every 7-10 days may help.
4. Malformed or stunted leaves and flowers
This is caused by spider mites. They are tiny
yellow, red or green spiders found on the
underside of leaves where they suck juices. The
application of Orthene or Isotox may help in
treating this infestation.
5. Weak and mottled leaves with tiny white webs
under them
This is caused by aphids. They are small
soft-bodied insects that usually brown, green or
red. Often clustered under leaves and flower
buds, they suck plant juices from tender buds.
Malathion or diazinon spray may help roses to
survive these bugs.
6. Flowers that don't open or are deformed when
they open.
Thrips could be the reason behind this problem.
They are slender, brown-yellow bugs with fringed
wings that also suck juices from flower buds.
Cut and discard the infested flowers. Orthene
and malathion may also treat this problem.
Remember that roses are hungry feeders that
require much fertilizer to remain the healthy
bushes you love and are proud of. |
