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When
using any of the chemicals listed below, always be sure to read and
follow all of the manufacturer’s directions before application. Some
rose varieties are sensitive and can suffer from some temporary leaf
damage due to the application of chemicals or oil sprays.
SPIDER MITES
Tiny
microscopic spider-like pests that suck juices from the plant. Cause a
stippling effect or webbing on the undersides and/or tops of leaves.
Some remedies include:
- Neem Oil (Rose
Defense)
- Bonide All Seasons
Spray Oil (Apply only in cooler weather. Some varieties may experience
some temporary leaf drop)
- Orthonex
- Bayer 2-in-1 Systemic
Rose & Flower Care
- Bayer Systemic
All-in-One Rose & Flower Care
- Hose off with water
APHIDS
Tiny
green, red or black insects that suck plant juices. Generally they are
seen on the tips of the tender new growth or on flower buds. They can
distort the new leaves and spread viruses.
Some remedies include:
- Neem Oil (Rose
Defense)
- Bonide All Seasons
Spray Oil (Apply only in cooler weather. Some varieties may experience
some temporary leaf drop)
- Safer Insecticidal
Soap
- Malathion
- Bayer 2-in-1 Systemic
Rose & Flower Care
- Bayer Systemic
All-in-One Rose & Flower Care
- Hose off with a strong
jet of water
- Ladybugs and other
predatory insects
ROSE
SLUG
The
larval form of the adult Sawfly. The upper or lower surfaces of the
leaves are eaten between the veins leaving a lacy, translucent layer of
tissue that turns brown.
Some remedies include:
- Greenlight Lawn and
Garden w/Spinosad used to control the larva.
- Sevin to control
hatching pupae.
POWDERY MILDEW
A
white powdery fungus that can distort leaves and flowers. Usually occurs
in spring or during periods of low clouds or humid weather.
Some remedies include:
- Planting roses in full
sun
- Hose off with water in
the mornings
- Immunox Fungicide
- Neem Oil (Rose
Defense)
- Bonide All Seasons
Spray Oil (Apply only in cooler weather. Some varieties may experience
some temporary leaf drop)
- Bonide Lime-sulphur
spray fungicide
- Ortho Rose Pride
(formerly Funginex)
- Bayer Systemic
All-in-One Rose & Flower Care
RUST
A
fungus that causes rust-colored spots underneath leaves.
Some remedies include:
- Avoid over-head
watering
- Stripping infected
foliage from canes
- Immunox Fungicide
- Neem Oil (Rose
Defense)
- Bonide Lime-sulphur
spray fungicide
- Ortho Rose Pride
(formerly Funginex)
- Bayer Systemic
All-in-One Rose & Flower Care
- Watering early in the
morning
BLACK
SPOT
Most
common in areas with moist and humid summers. Small black spots appear
on leaves which then yellow and drop.
- Some remedies include:
- Neem oil (Rose
Defense)
- Stripping canes of
infected foliage
- Immunox Fungicide
- Bonide Lime-sulphur
spray fungicide
- Ortho Rose Pride
(formerly Funginex)
- Bayer Systemic
All-in-One Rose & Flower Care
DOWNY
MILDEW
Before the incredible rains of early 2005, most of us had never
experienced Downy Mildew. This was a disease that was more prevalent on
the coast or areas that have substantial rainfall. Downy Mildew is an
air-born fungus. Leaf symptoms include purple-brown spots that resembles
Black Spot. The leaves may then turn yellow and drop off rapidly. The
fungus is most active when humid weather
conditions persist (over 85% humidity and 55-65 degrees).
- Reduced incidence is
achieved by lowered humidity, a rise in temperature and a preventative
application of fungicide. Since temperature and humidity can not be
controlled, a regular application of the fungicide, Monterey Aliette, is
recommended
- Neem Oil (Rose
Defense)
- Keep rose beds clean
of leaves, debris and clippings
- Air circulation is
important when choosing a site for your rose garden
- Avoid overhead
watering
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