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.
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.
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.
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.
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.
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.
All rights reserved. Text, graphics, and HTML code are protected by US and International
Copyright Laws, and may not be copied, reprinted, published, translated,
hosted, or otherwise distributed by any means without written