Canna virus and leaf damage

The first three images are of leaf and stem issues that are not canna virus. The first issue gave me some concern for a few years until I could establish this was not a virus. New leaves twist and entangle and do not unfold. Affecting individual but sometimes groups of the same variety growing in the same conditions. This can affect the plant for a few weeks and actually soon grows out. Despite looking serious this doesn't affect the same plants over and over. There is no pattern to what plants are affected but there is an association with high day time / cool night time temperature extremes which most often occur in the spring and early summer, occasionally later on.

Fungal damage often alarms new growers who are worried about canna virus. It occurs frequently on plants grown inside as the scorch occurs with poor air circulation which can even happen outside on a slowly developing leaf. Shown on images two and three. Similar looking damage can occur on the first emerging leaves of plants from overwintered rhizomes. 

CANNA VIRUS IMAGES ARE THE LAST SIX PHOTOS. Canna virus is seriuosly bad news and can devastate a plant or collection. There are a handful of different viruses that affect canna. One can be caught from infected beans such as runner beans with a virus. Another can be caught from members of the cucumber family with virus. Two or three others only spread from canna to canna. All canna virus are mostly spread in two ways from plant to plant by either Aphids or through propagation or cutting as in trimming off flower stems on an infected plant and then cutting another.

The key thing to check if you are concerned is that when virus has shown itself it can be seen in newly produced leaves. Old leaves get all sorts of blemishes and dodgy looking damage especially on a stem that has finished flowering but these are not worth being concerned over. Remember check-new -leaves for virus. Quarantine new plants if you can and burn any that have virus. One final point is on the stripey leaved cannas virus is difficult to detect. Check the page header image of virus free Canna Bethany and compare it too the last image of Canna Pretoria. The canna virus damage goes quickly brown between the stripes. This is a quite new leaf and looks like an old leaf. The plant was newly acquired online from another nursery by mail order and developed virus in quarantine and was burned after this photo was taken.