Basic Rose Gardening Tips
By: H. Iacobacci-Miller
It may be hard to believe, but summer officially starts June 21st.
With your gardens and flowerbeds in order, it's time for maintenance,
which usually includes keeping pests away from your plants, especially
your prized roses.
I must confess, I am a rose lover, but sometimes the up-keep can
seem like an impossible feat. Each rose comes with it's own unique
beauty and problems. Too keep your roses in top shape, it's important
to know the various problems that can wreak havoc and how to prevent
||WHAT IT DOES
Black spots on leaves
Circular black spots with fringed edges on
leaves. Initially may appear as yellowish spots.
Causes leaves to yellow. Lower leaves are
Remove infected leaves and pick up any leaves
around rose. For roses already infected, spray Manzate or
Mancozeb every 3 days for 3 intervals. For future prevention,
spray with Funginex every 7 - 10 days.
|Young canes are stunted and malformed.
||Fungal disease covering leaves, buds and stems with white
powder spread by wind.
||Leaves curl and turn purple.
||Spray Benomyl or Funginex every seven to 10 days.
|Underside of leaves have "blisters" or orange spots
||Orange-red blisters that turn black in fall.
||Attacks new growth in spring. Is able to survive winter.
||Collect and discard infected leaves in fall. Spray Benomyl
or Funginex every seven to 10 days.
|Stunted or malformed foliage and blooms.
||Small soft-bodied green, brown or red insect clustered under
leaves and flower buds
||Suck plant juices from tender new grown and buds.
||Spray with malathion or diazinon.
|Mottled and weak leaves. Tiny white webs under leaves.
||Tiny, green, red or yellow spiders on the underside of leaves.
||Suck juices from leaves.
||Apply Isotox or Orthene.
|Flowers don't open or they open deformed. petals are flecked
||Slender, brown-yellow insects with fringed wings nesting in
||Suck juices from flower buds.
||Cut and discard infested flowers. Apply malathion or Orthene
in spring before buds have developed.
|Canes are hollow or appear to be rotting.
||Insect and larvae difficult to spot as they live inside the
rose cane. Check canes for external damage.
||Bore into cane and lay eggs. Larvae eat their way down through
||Cut cane off below the infection. Or prune back to expose
wood. Seal wounds and entry points with nail polish, glue or
Tips for Treatment Applications:
- Spray or dust with fungicide every seven to 10 days throughout
the growing season
- Dust in the evening, or when wind is absent
- Spray both the upper and lower surfaces of leaves with a fine
- Apply pesticides early in the day to prevent the foliage from
burning in high temperatures
- Follow manufacturer's instructions
- As a note, from my experience bi-weekly spraying tends to keep
most of the listed ailments under control. Prevention seems to
be the key when trying to care for roses.
For me, Cane-boreres and black spots have been the most difficult
rose ailments to control. Some roses seem to be much more resistant
than others, so if you love roses, but not the work, try purchasing
some of the easier to care for roses. Here is a list of just a few:
Rugosa Roses - for the most part tend to be free of black
spot, rust and powdery mildew
- R. rugosa - white, pink or pinkish-red with a light, sweet scent
- Blanc Double de Coubert - sweet-smelling, semi-double white
- Fru Dagmar Hastrup - large single pink flowers, compact
- Hansa - large, fragrant, double, purplish-pink flowers
- F.J. Grootendorst - Ruffle-petaled double red flowers resemble
carnations and have slight fragrance
- Fimbriata - pale pink, strong fragrance.
- Carefree Wonder - Lighter reverse, pink blend, cupped, double
blooms, mild fragrance
- Martha's Vineyard - Deep pink, double, small bloom
- Augusta - Apricot & apricot blend blooms, mild fragrance
- The Fairy - clustered, pale pink, double flower blooms
- Lady of the Dawn - Light pink, large, semi-double bloom blooms,
- Minnie Pearl - pink blooms, mild fragrance
- Jean Lajoie - Medium pink blooms with a dense petal count, mild
- Hot Tamale - Yellow/red blooms with a 26 - 40 petal count
- Black Jade - Deep red, dense petal count
- Snow Bride - white/cream blooms, mild fragrance
For more detailed information on various roses, check out Michigan Bulb Co.