The picture is very sad and pitiful: the leaves hang, yellow and dry up, the flowers do not open and the canna vegetates. What could be the reason? Are there special diseases and pests that like to plague the canna?
What diseases can occur in Cannas?
Canna diseases are usually due to care errors. Powdery mildew, chlorosis and canna yellow mottle virus are common. Prevention and treatment include removing diseased parts of the plant, targeted fertilizing and watering in the root area. Pests such as spider mites, aphids and slugs can also occur.
Is the canna susceptible to diseases and pests?
In principle, the Canna isneitherparticularlysusceptible to diseases nor to pests It generally stays he althy if the care is tailored to it is carried out. However, if the Indian flower cane in the garden is under stress, it loses energy and pests and pathogens have an easy time of it.
Which disease occurs most often in Canna?
TheMildewsometimes occurs on the Canna. Powdery mildew is favored by persistent heat and dryness and can be recognized on the canna by a whitish coating on the leaves (usually on the underside). Later the leaves curl before finally falling off. Downy mildew occasionally attacks canna in particularly humid regions. If the leaves are repeatedly exposed to a lot of moisture, the fungus has an easy time developing.
How can you treat and prevent mildew on canna?
Sick plant partsof the canna should be removed as quickly as possible and whenever they become visibleCare errors should also be corrected. Too much fertilizer can often make it easier for fungal pathogens to infest. Therefore:Fertilize lessIn addition, you should only water theroot areaof the canna and not its leaves and flowerswater
What other diseases can be dangerous to canna?
Other diseases that can arise from canna includeChlorosisand theCanna Yellow Mottle Virus For the prevention and treatment of chlorosis Nutrients, i.e. targeted fertilizer applications, help. However, if your Canna has the Canna Yellow Mottle Virus, there is no known antidote. The virus, which occurs preferentially in damp, cool weather, causes such enormous and lasting damage to the plant that the plant has to be completely disposed of.
Which pests can make life difficult for the canna?
Spider mites, whiteflies, aphids, but alsoNudibranchsandVoles like to fall in love into the canna. You can rinse off the harmful insects that prefer to feast on the leaves and flowers with a jet of water (repeat regularly!). It is possible to prevent an infestation with beneficial insects such as ladybird larvae and parasitic wasps.
Slugs can be collected or destroyed with slug pellets (€16.00 on Amazon). A barrier of sand around the canna can also keep the slugs away. Snail damage usually only occurs during and shortly after the canna sprouts.
Tip
If the canna is infested with pests, replace the soil
If cannas in the pot are infested with pests such as aphids and spider mites, the soil should also be replaced. Many pests lay their eggs in the soil and the infestation begins again after a short period of rest.
