Karchesky Canna
           & Brugmansia
 

  Cannas by Type


 

Canna

Diseases & Pests


In the last years many of the world's cannas have become infected with viruses that spread easily and bring down the health of the plant even to where it will die.

Canna yellow mottle virus (badnavirus) CaYMV and canna streak virus CaYSV are two to bring the most concern. The easiest to spread is the canna yellow streak virus which in a short time will spread to all cannas grown in proximity.

Many cannas have become infected all over the world even to cause several of the largest growers to close.

Keep a watchful eye when sharing or purchasing new cannas to not bring home virused stock. Grow your new cannas isolated from all your others until you can inspect for disease and to be sure they are healthy.

Rust will also infect cannas, especially in warmer humid climates where it spreads by spores. Removing and burning or bagging and trashing affected parts and then applying available treatments will help to control. Rust can also be seen in the humid months in cooler climates, but fortunately it will usually not winter over to the next season.

The greater (calpodes ethlius) and lesser (geshna cannalis) leaf roller can also affect cannas greatly especially in warmer climates. Japanese Beetles will also cause a lot of damage to canna leaves and blooms. Although several organic treatments are available and some insecticides will give good short term treatment, systemics work best for extended control. However, manufacturers are currently accused of these products contributing to colony collapse in honey bees. On that note, we will not use them. However, if you decide systemics, please use with discretion.

Aphids will occasionally attack cannas and can spread disease. Keeping a watchful eye and destroying larvae if as you see it is good prevention. Sprayed applications of soapy water will work well to keep aphids at bay. Keeping a watchful eye for any pests and nipping attacks in the bud is the best prevention to eliminate infestations.
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