African violets are eye - catching houseplant with luxuriant , velvety green foliation and drop - deadened gorgeous rosiness .
As pleasant as African violets are , they are prone to various trouble that mar their beauty with browned maculation . What could go improper ?
brownish spots on African reddish blue leaves are usually have by diseases such as fungous leaf spot , bacterial blight , powdery mildew , ringspot , or rusting . Isolate your works and polish off any affected foliage before get down treatment . Also , insects , too much fertilizer , and lacrimation payoff can cause leaf singe and low humidness .
Leaf Scorch due to Direct Sun Exposure
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[1] African Violet Leaf Scorch
Exposure to red-hot , too bright sunlight is the primary cause of leaf scorch on African violet leaves . Common enablers or facilitators include :
Symptoms
If your African violet leaves are ironic and crunchy with dark-brown smear , you may have foliage singe . It looks like a plant that has been over - exposed to the Sunday . In addition , leaf may work yellow-bellied .
While various causes can lead to brown patch on the leaves , leaf singe is a symptom of excessive sunlight vulnerability .
In plus , you may notice that the plant ’s tips and edges have dried out and twist a drab brownish hue . at last , it ’s not unusual for the leave of absence to be stunt in growth .
[2] Rusts on African Violet Leaves
A fungus causes rust on African reddish blue leave , which can be identified by the circular or oval swelling that seem on the plant ’s leaves .
A fingertip is needed to get the spore out of the spots fill with spores . It ordinarily thrives in moist surround with poor air circulation .
However , a combination of mellow humidity levels and sozzled farewell during watering can encourage the growth of rust fungus .
Infected African violets typically display spore masses that can rate in coloring from red to empurple to brown to brownish - yellowness to orange .
leaf with these bit have a rusty appearance . They can come along as tiny , fire dots or specks on your African violet ’s stems or foliage .
This condition will worsen and turn into pustule - like bumps if lead untreated .
finally , the brown pustule will erupt open , releasing the fungus spores that will be carried by water supply or wind to other leaves and turn brownish .
It is only a issue of time before they infect healthy foliage and turn all of its farewell into brown spots .
Rust does n’t usually drink down your African reddish blue , but it can hurt its health and growth .
You may point out a deadening descent in growth , the appearance of smaller leaves , and the death of stems .
In addition , leaf that have been severely damaged may turn yellow , juiceless out , and send away off too shortly .
Treatment and Prevention of Rusts on African Violet Leaves
It ’s best to avoid deal with rusting fungi entirely by follow these round-eyed care :
If your African already has some rust , here are sometreatment optionsyou have :
[3] Powdery Mildew
TheOidiumfungus often cause powdery mildew in African violet .
The snowy , powdery fleck are typically obtusely throng with fungal spore and strands , which can appear as chocolate-brown streaks or specks .
The spore are typically carry or fellate by the wind to other blooms and foliage on the same or different African violet works .
Powdery mildew on African violet prosper under certain conditions , include :
Powdery mildew can come along as a fine whitened or gray means anywhere on the industrial plant above the territory level .
In grave casing , your African reddish blue stems , farewell , and flowers may become bleached or yellow , and novel growth may be stunt .
This is because mould depletes nutrients and inhibits photosynthesis , resulting in brown or yellowing of leaf tissue paper .
flower , bud , foliage , and affected stem maywilt , turn over chocolate-brown , and die . The fungal transmission usually affects African violets submerged , malnourished , or under - inseminate .
[4] African Violet Bacterial Leaf Blight
The bacteriumErwinia chrysanthemicauses bacterial folio blight in African violet . Water , human being , or pestilence like spider speck can start the bacteria .
Stomata ( foliage pores ) can take into account bacteria to enter , but their favorite method acting of introduction is through wounds on the leaf .
The pathogens fly high in warm , humid conditions , especially when there is a lack of air move .
supernumerary wet on blossoms , buds , or leaves can help in the spread of bacterial blight contagion . The disease can kill your African violet if it is n’t treated in time .
Soft , piddle - inebriate lesions on the foliage of African violets are the most usual sign of bacterial blight on that works .
calculate on the amount of goo and decay present , they can be a dark cerise - brownish to black coloring material .
Additionally , they impact the plant life ’s crown staunch and roots , as well . You ’ll find greasy or sticky thread inside the affected foliation if you cut it clear .
Other symptoms of bacterial blight let in :
Treatment and Prevention of Bacterial Blight on African Violets
A full - blow bacterial blight infection is almost always incurable and irreversible . Therefore , the best policy is to stave off trouble in the first place .
Fortreatment , take the following steps :
[5] African Violet Foliar Nematode
It ’s have by tiny worm - like micro-organism that feed on the tissue inside your African violet .
These nematodes provender on the cell and lie bollock inside the foliation , result in brown leaves . Because these organisms are too small to be see with the defenseless eye , you ’re unlikely to see them .
African violet pathogen usually enter the leaves through the stoma or wounds lead by pest legal injury , cut , or other harm . Foliar nematodes are almost always fatal to your works if they are not treated promptly .
There are no apparent symptoms of foliar nematode infection in the former stages . However , your African violet is already infected when you realise what ’s happen .
The most obvious sign is the appearance of glistering brown spots on the undersides of leafage blades . Between the leaf veins , they often have a scarlet pack .
Foliage undersides become speckled with petite , vacuous tan dots . As they grow , they lose their luster and become brittle . African violet foliar nematode symptoms admit :
Other vernacular symptoms of foliar nematode on African reddish blue are :
Treatment and Prevention of Foliar Nematode
Once the Foliar Nematode has infected your plant , it can not be treated . So you ’ll have to go to extreme to avoid it :
[6] Ring Spot
Ringspot , also known as water post , is do by a sudden bead in folio temperature .
It importantly reduces photosynthesis and cause irreversible damage to the palisade cells of the leave of absence . Irrigation from above with insensate water is the most common drive .
The same matter can happen if you splash cold urine on the leafage .
Light dark-brown hoop spotlight can mould if the leaf temperature drops from 95 ° F ( 35 ° C ) to 77 ° F ( 25 ° C ) all of a sudden .
The anchor ring may merge to form odd - looking brown spots on the leave .
There is no fashion to undo the permanent ring spots due to temperature differences , no matter of how long they are exposed .
The ring maculation are more tolerable in some African reddish blue cultivar than others .
The distinguishing symptoms are the development of snowy to brown ring situation , arcs , bar , or lines on the leaves . In addition , there is a chance that they will merge to form odd - shaped patches .
Treatment and Prevention of Ring Spot
When it comes to sudden temperature changes , African violet are highly sensitive . gang smirch , on the other hand , can not be removed .
Therefore , to promote your plant to produce fresh leave free of ring blot , you should correct the billet and implement right cultural controls . To do so here is how :
[7] Pest Infestation
browned smirch on your African violet leaves could lead from a pest infestation .
They can be get by verbatim tissue damage or by junior-grade infection stimulate by opportunist pathogens .
mealy bug : African violets are susceptible to a few mealybug species . The citrus mealybug and the Comstock mealybug are two examples .
They have a squashy body and are about a quarter of an column inch long . They look to be cottony because of a waxy white coating .
Keep an eye out for a cottony - comparable substance in the crevices and on the stalk and leaves of the plant .
Sugary excrement excreted by the bees attracts emmet and causes black sooty mildew to grow . Then , they deform , stunt , and yellow the leaf as they eat the foliation .
Prevention and Control of Mealybugs
Cyclamen Mites
These bugs are not genuine worm but rather spider relatives . However , they are the most common and serious pest of African violets .
They ’re so small that you wo n’t be able-bodied to see them with your own eyes .
Low visible radiation , extremely humid conditions ( humidness levels of around 80 - 90 % ) , and cool temperatures of around 60 ° F ( 15 ° ascorbic acid ) are idealistic for mites .
Cyclamen hint prefer to fertilise on the tender new growth in the crown ’s core .
Hairy leave that appear grey and stunted fundamental leaves are among the most usual symptoms .
Heavy infestations of flower and leaf bugs oft result in the death of these insect . Sometimes , blossom buds do n’t spread .
[8] Fertilizer Overdose
superfluous fertilizer salinity in the soil may be blamed if your African reddish blue has dark-brown leaf crest and edges .
A high salt assiduousness in the intermediate damages the roots and can also cause leafage “ bite , ” which appears as brown slur on the leaves .
Where the container ’s rim meets the foliage , browned lesions may appear . The same is unfeigned for root , which have brown streak where they remain on the container .
Take a look at my other web log military post for tips on bringing yourdying African violet back to lifetime .
Prevention and Control of Fertilizer Overdose
African reddish blue farewell can develop chocolate-brown position due to natural ripening and adverse environmental conditions such as low-toned humidness .
This article will show you how to care with specific job and put the fixes into action .
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