There ’s nothing quite like the nerve of a tropic garden oasis . With their lavish leave and long - blooming flowers , canna lilies are a pop choice for gardener to include in these spaces .
Canna lilies are water - loving plants that thrive in full Lord’s Day and gamey humidity . Unfortunately , this growing surround brings specific issues – chiefly fungus kingdom , bacteria , and pest - borne computer virus .
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Photo by Anette Phibbs, WI Department of Agriculture, Trade & Consumer Protection, Bugwood.org.
This is n’t meant to daunt you aside . Canna lilies are exceptional plants .
They are leisurely to grow and have minimum disease issues – a gardener ’s dreaming ! If you have the space and live in USDA Hardiness Zones 7 to 10 , I could n’t recommend these plants more .
Find cultivation instructions in our guide to rise canna lilies .
Today , we ’ll be diving into the most common diseases you may experience while develop your plants . Here ’s what ’s ahead :
How to Identify and Manage 5 Common Canna Lily Diseases
1. Bacterial Leaf Spot and Bud Rot
Bacterial folio spot and bud rot is because of the bacteriaXanthomonas cannae . This bacterial infection should be take seriously if your plant begins showing symptoms , but it wo n’t prove calamitous if you are able to control the spread .
This bacterium flourish in consistently damp and warm environments , and it ’s distribute by rainwater or water . So it makes sentience that canna lily might be a viable boniface plant life .
In its initial stages of infection , the bacterium point the folio . They will begin to change state yellow , starting from the veins , and eventually shape lesions .
As the disease progresses , the leaves will in the end succumb to sphacelus . The bacteria will then go on to the blooms , causing bud rot .
you could belittle the death triggered by this disease by murder the affected foliage and throwing it into the trash orfirepit .
Also , thin out the stalks of your plants to meliorate air flow . As a general lacrimation peak , avoid water from overhead to decrease the hazard of splashing , which can spread disease .
While chemical substance control is unnecessary when get by with bacterial foliage spot , you may well control the facing pages by using a liquid fuzz - base fungicide spray .
Copper Fungicide
you may find Copper Fungicide from Bonide , usable from Arbico Organicsin a 32 - ounce nursing bottle .
Copper - based fungicides should be sprayed on the acme and bottoms of the leaves , reapplying every seven to ten days until vigor improves .
2. Botrytis Blight
Botrytis blight , also bonk as grey mildew , is triggered by the fungusBotrytis cinerea . This fungus strike in the spring and former summer when the humidity is high , and the temperature is between 60 and 75 ° degree Fahrenheit .
You ’ll know your plants have botrytis blight if you notice dark-brown floater on the foliage and heyday bud . As the fungus spreads and the infection progresses , a gray fuzzy mold will appear .
fortunately , there ’s no reason to panic – B. cinereais soft to preventandmanage if your plant receive an infection . We ’ll be take a two - footstep approach to combat this fungus .
The two main manner to prevent botrytis blight are to first advance air circulation and crop aside dead leaf , and then to apply a fungicide .
You ’ll call for to take away any deadened or die leaves throughout the grow season to determine the risk of infection .
While it ’s always important to practise good sanitation around your industrial plant , it ’s crucial when you ’re trying to prevent botrytis blight .
After you ’ve cleaned up the planting area , postdate up with an app of your option of a broad - spectrum pig - base antifungal .
You might also view a beneficial bacteria - based fungicide like Bonide ’s Revitalize Biofungicidefrom Arbico Organics .
Bonide Revitalize Biofungicide
This fungicide usesBacillus amyloliquefaciens , and works by trigger off an resistant response in your canna lilies . Your flora ’s resistant organization works to fight off the blight on its own , with a little bit of help from the bacteria .
Whether using a atomic number 29 - ground fungicide or a biofungicide , succeed the directions on the Cartesian product packaging for specific program pace .
3. Rhizome Rot
Rhizome rot is make by the soilborne fungusSclerotium rolfsiiandFusariumspecies . When the soil is consistently moist , and if there is significant crowding , rootstock rot will fall upon when temperature are in high spirits – between 77 and 95 ° F .
This fungus broadcast to the rhizomes of your canna lilies and causes them to waste under the soil . A white cottony fungus will start growing on the rhizomes in forward-looking cases .
To help prevent contagion , check that to properly thin and divide your canna lily to improve air circulation around the plants .
When it comes to treatment , there are no in effect options currently uncommitted , and there is no way to chemically or biologically control rhizome rot in your plants once exposed .
Remove the total industrial plant from the planting area , rhizomes and all , and dispose of it in your garbage binful or firepit .
4. Rust
Canna rust fungus , make by the fungusPuccinia thaliae , is a fungous disease common in canna lily . If you have a especially wet and humid spring , your plants will be at risk of watch rusting .
The pathogen that induce this disease favors filth that is constantly waterlogged , with long periods of rain and heavy humidity . Poor air circulation helps it to thrive .
The disease produces numerous small-scale , lily-livered , on an irregular basis mold powdery pustules on leaf and flowers .
In the early stages of infection , the undersides of folio or stem will be covered in these pustule . In the advanced stage , the fungus will cover most of the top parts of the leaves , eventually crisping them up and induce leaf drop-off .
If your plants are experiencing rusting , know that all nearby canna lilies are susceptible to its scatter , particularly if the damp weather persists through the bounce season .
When you first notice rust on your plant , take away the affected leaf immediately and dispose of it in your shabu or firepit .
If the rust has already progressed to an advance stage , dig up up and remove the full plant from your garden and any others within touching distance .
For those with infections that have not yet become dangerous , the stay on fungus will be difficult to eradicate , but there are options to protect your plants .
However , rust necessitate fungicide rotary motion , so the fungus does n’t grow resistant to your treatments . Read more about theimportance of flip fungicides to prevent resistance .
For your first round of treatment , employ a eminent - timber , bull - found antimycotic like Bonide Liquid Copper . wholly drench your plants , cover both the spinning top and bottoms of the leave . This handling will last seven to ten sidereal day without rain .
Next , grab a biological fungicide formulated to defend fungi like rusting . Arbico Organics declare oneself onecalled Cease , which uses the bacteriaBacillus subtilis .
CEASE Biological Fungicide
This fungicide works by crowding out rust fungus spore living on the foliation , thereby interrupt sprouting and bed covering . go for every three sidereal day for nine days full before switching back to your copper fungicide .
The starvation of the fungus kingdom by the bacterium put this antimycotic agent at amuchlower risk of creating fungal impedance than the ordered app of the pig - found fungicide . But it should still be used in a treatment gyration , just to be 100 per centum sure .
Like the copper - free-base antifungal , Cease is susceptible to rain and will be wash away . Make certain to read the product publicity for specific program recommendation .
Rust might be the independent issue you face when growing canna lily . If you ’re currently experience rust , I promote you to check out ourguide to identifying , managing and preventing this disease .
5. Viruses
Canna lilies are susceptible to a few types of viruses . A viral infection is a serious take and it needs to be identified and managed as shortly as possible .
All virus will manifest symptom in a few unlike ways . Mainly , you ’ll want to look for scrubby growth , streaking or twisting of the foliage , and distort coloration on the bloom .
These symptoms will become more aggressive as the disease progresses and will possibly scatter to any susceptible plants nearby .
There is no known means to chemically or biologically cure viruses in your canna lily .
If you find your plant life has been infected with a virus , you should remove it immediately from your landscape painting , as well as any other flora within poignant distance . Put those plants in the codswallop or burn them to reduce or egest the spread .
The main computer virus that affect canna lilies are :
Bean Yellow Mosaic Virus (BYMV)
BYMV , in the Potyviridae family , is convey by aphid when they suck the sap from the foliation of your plants .
If you have an infected plant life , aphid can channelize the virus to other cannas in your garden . In improver , the virus can also be transport via septic seed .
This virus causes symptom that admit leaf disfigurement , mosaic , and leaf mottling or marbling . It ’s not specific to canna lilies and can taint many industrial plant such asfreesia , gladiolus , andbeans .
Aphids are an promiscuous pest to forbid and superintend , so check outour templet for top on manipulate these pest .
Canna Yellow Mottle Virus (CYMV)
CYMV is a virus that affects only canna lily . It is not know how this computer virus spreads , but the spread may be stimulate by poor sanitation when part plants in commercial options .
In commercial configurations , canna lilies are divide by separating the rhizomes with a shrill knife . Unfortunately , this extension method acting open up up the works to viral infection .
screen out for viruses like CYMV is difficult in these preferences , sometimes resulting in abode gardeners unexpectedly introducing this virus into their landscape when they bring new plants home .
Always expend hygienize horticulture tools before cutting into your plants , especially when separating the rootstalk . Using hygienise tools will reduce the peril of viral spread .
Canna Yellow Streak Virus (CaYSV)
CaYSV is a fresh discovered computer virus specific to canna lilies , first identify in 2007 in England by virologists at the Central Science Laboratory in York , UK . It ’s part of the genusPotyvirusand is nearly related to the mosaic viruses .
The primary symptom of CaYSV is mosaic or color streaking of the leaves . In advanced stage , leaves will become necrotic and nippy up , falling to the ground . take out these leaves from the expanse as before long as possible to cut the chances of further spread .
CaYSV , like BYMV , is spread from canna to canna through aphids when they flow on the sap of your plant .
Cucumber Mosaic Virus (CMV)
CMV is a virus in the Bromoviridae family and the genusCucumovirus . CMV has an improbably wide host cooking stove that include vegetable plants and ornamentals . regrettably , this also include your canna lilies .
This virus is , once again , mainly transmitted by aphids when they flow – comment a approach pattern ? This computer virus is also known to circulate through propagation when the rhizomes are break .
CMV symptoms build up in new development only . Like the other virus on this list , your plant will experience icteric mottling , mosaic , stunted growth , minute leaves , and prime deformities .
Tomato Aspermy Virus (TAV)
Like CMV , TAV is a virus in the Bromoviridae family and the genusCucumovirus . It is not specific to canna .
TAV is also circulate by aphids , and will cause yellow mottling on the flowers , mosaic , streak of the leafage , stunted growth , and colour “ fracture ” – or snowy streaks – in the blooming prime .
Canna You Dig It?
These tropic plants thrive in surround with moist grime and tropical develop conditions . However , their water - loving nature bring likely issues like bacterial infections , fungous disease , and pestilence - drive viruses .
observe the region around your plant life sanitary , plus give them infinite to breathe , will forestall most fungal and bacterial transmission from striking . But if you do remark symptoms of one of these issues , using a high-pitched - character fluent copper fungicide will control most outbreaks .
When it come to computer virus , take infected plants from the garden is the most critical gradation you could take . In addition , be sure to always sanitise your garden tools before cutting the rhizomes of your cannas and between industrial plant to reduce the danger of disease spread .
And for more information aboutgrowing canna lilies in your garden , check out these guides next :
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Sarah Patton
