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Rose troubleshooting: FAQs
What is a rose gall?
Rose galls look like a large, brown growth with warts all over it. They are usually caused by bacteria that have entered because of damage to the stem and can simply be cut out. However if these type of growths are on the roots then it is more serious because they can weaken the plant.
What is causing the white foam on my rose canes?
There is a little greeny-yellow bug that hides inside a small blob of foam. It is called a spittle bug . It sucks the juices from the canes and may cause leaves to wilt. They can easily be removed with a jet spray of water from a hose.
Why have my rose leaves and stems all gone white?
When the weather is hot days and cold nights it becomes the idea condition for downy mildew. This is the worst kind as it will overwinter on the canes and show up again when next year. Spraying at the first sign with a fungicide weekly until all signs are gone will cure it. Some roses will get it if their roots are dry so a mulch is a good idea. Too close planting where air cannot circulate is another reason for this type of mildew.
Why did my rose bush just dropped all its leaves?
A rose drops off all its leaves for two reason. One is to conserve water for the roots when it is too dry and the other is because of stress such as newly planted. Roses have three leaf buds and can produce three sets of leaves. When they get enough water or get stabilised in their new home, they will then put out new leaves and start to grow again.
Why did some of my rose canes die back?
Die-back on roses is not a specific disease. It can be caused by frost damage, canker at the base of the stem, water-logging, mildew, and blackspot. Some colours are more susceptible to it such as yellow and orange varieties.
What is that mossy pincushion on my rose leaves?
These orange, moss-covered looking growths appear on rose leaves in June and July and are caused by the gall wasp. Each is a mass of cells which contain one gall wasp larvae which will hatch in the spring. Gall wasps like to eat aphids. They don't do any harm and can be cut off.
My rose leaves are suddenly twisted and deformed.
Leaf stalks that are twisted in a spiral, stems that are distorted and reddish are caused by a weed killer that was used on a windy day and has drifted on to the roses. Cut off all the infected stems and leaves then feed and water well. If the chemical hasn't reached the bud union or the roots then the rose will survive.
My rose bush has distorted bright red leaves and very thorny canes.
There is a virus type disease called rose rosette and it is caused my a microscopic mite. They usually don't attack hybrid teas mainly shrub type roses. The new growth has bright red distorted leaves and excessive thorniness on the canes. The bush usually dies within one year. This disease can be transmitted by cuttings.
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