Rose stem diseases due to fungi , virus and bacterium are not only detrimental to cane but also to foliage and blooms . perpetrator may be location - specific or widespread . gardener capable of identifying existing and likely job are able-bodied to cure or prevent disease . As a first line of defense , buy only top - calibre flora , certified stock free of disease .

Crown Gall

Rose Rosette

Rose little potato , or witches'-broom of rose , has unknown origins . Limited to the genus Rosa , this disease is open by eriophyid mites and graft . Rapid growth of ruby pigmented stems is the first symptom of rosaceous rose window . Leaves will show lowly symptoms in the form of deformation , brittleness and yellow or ruby-red food coloring . This rose disease has no cure and plants will drop dead completely within two to five yr . At the first sign of witches'-broom , plants should be removed and destruct to forbid circularize . Pesticides provide some auspices when used weekly during June and July .

Canker

Canker is due to several types of fungi . This disease will produce lesions on the rose canes . provide neglected , stems will die entirely . absent and destroy septic canes . Prune well below visible cankers with sterilized shears . A solution of 1 part blanching agent to 10 parts water is suggested for desexualize shears between cold shoulder . canker sore enters stems through existing injury . Take care when planting to avoid vulnerability .

Botrytis Blight

Botrytis blight is a fungal disease . Blight make buds to remain unopened or overleap only . Grayish - black lesion are visible on stems below swag buds . Remove and destroy any dying bud below where the infection thrives . Prevent water from sitting on leaves and bud by plant in full sun .

Mosaic

Mosaic is induced by a computer virus . Some rise varieties ' stems will show symptoms of weakness and ill - proportion , while others will develop crinkly , yellow occupation on leaves . unluckily , mosaic is incurable . Aphids will spread the computer virus , and population control is necessary with pesticide . When rationalise , sterilize shear before incite to a new industrial plant with a solution of 1 part bleach to 10 parts water . works gravely septic must be removed and destroyed .

Rust

pink wine rust is a fungous disease common in the western United States . In its initial stages , undersurface of infected leaves are covered in an orange , powdery substance . Yellow or orange musca volitans will appear on the tops of leaves as the disease progresses . Canes may curl , and yellowish - red pustules will appear on stems as the infection develops . Remove and destroy leaves and cane show signs of infection . Apply a antifungal if the disease is widespread .

References

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