Yucca plant black spots

Diseases That Affect Yucca Plants And Ways to Control Them

Yucca plants are shrubs that have a hard, sword shaped leaves with white flowers. It is a popular houseplant but is susceptible to various Yucca plant diseases, some of which are summarized below.

The scientific name is Yucca elephantipes, and they have sharp, spear-shaped projections, which radiate from the central stalk. They are highly popular, both as indoor and outdoor plants. Although they are relatively easy to maintain, they are susceptible to some problems. Some of them include yellowing of the leaves, lesions, brown discoloration on the surface of the leaves, and rotting of the stem. Some other Yucca plant diseases are given in the following paragraphs.

Brown Spots

Appearance of brown spots on the leaves is among one of the most common problems. The spots are generally of 2 to 3 centimeters in diameter with a purple border. These spots on the leaf first appears as tiny clear zones in older leaves. The spots turn yellowish and finally brown, as they mature. They are usually oval in shape and are scattered across the entire surface the leaves that are at the bottom. Yellow leaves are also seen in some cases.

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Control Measure:

This can be best cured by simply removing the infected leaves. Spray the plant with a fungicide to prevent brown spots from appearing again.

Gray Leaf Spotting

Gray leaf spotting is also among one of the many problems. These are more common in older leaves and are seen as legions, which are gray in color with brown margins.

Control Measure:

To control this, apply a fungicide and remove the infected leaves.

Necrotic Tips

Due to death of cells, the tips and edges of the plant shrivel up. There can also be discoloration of the leaves along the tips and edges.

Control Measure:

To take care of this problem, increase the pH of soil by adding lime.

Stem Rot

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One of the most common problems that most homeowners have to deal with is rotting of the stems. If the decay is not arrested at the beginning, it might lead to destruction of the whole plant. Rotting is caused by bacteria, and you will find the stem of the leaves having a soft mushy discharge, which gives an unpleasant odor.

Control Measure:

This can be avoided by using only sterilized pots and proper potting soil when planting the cuttings.


Sometimes, you might see a white growth on the plant, which has a fan-like pattern. This is usually found on the stems near the surface of the soil. These problems are caused by fungal attacks, and it is called sclerotia.

Control Measure:

It can be somewhat controlled by use of a proper fungicide.

Tips for Growing

The best way of growing this plant is from a cutting. The cuttings should come from a mature growth rather than a new growth, as the new growth is more prone to rotting. Use a sharp knife to take a cutting from the plant and remove the top most leaves. Place the cutting in a shady place for 2 to 3 days to allow the cutting to dry out. Now, place the cutting in some potting soil and keep it in a place where it can get direct sunlight. It will take about 3 to 4 weeks for the cutting to grow roots. Another way is from the seeds, which takes anywhere from a month or a year to germinate. Plant the seeds in potting soil after lightly rubbing the seeds with a bit of sandpaper. Regular watering of the soil is very crucial if you want to see the seedlings sprout in about 1 to 2 weeks.

So, we have seen that there are many yucca plant diseases that are caused both by bacterial as well as fungal attack. Use of fungicides are helpful for preventing such diseases caused by fungi, but their use should not be used more than twice a year, as it stunts the growth of the plant.

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Troubleshooting yucca problems

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Yellowing leaves

Yellow yucca leaves are an issue most commonly attributed to overwatering. Most yucca varieties require little water and are generally happy with a generous weekly watering in summer and a decent monthly watering in the cooler months. Yellow yucca leaves can also be caused by a lack of direct sunlight.

Gray or brown spots on yucca leaves

Patchy or spotted gray areas found on the leaves of the yucca plant are most often a result of fungal disease. When these blemishes are found, it is best to remove any affected leaves and treat the plant with copper fungicide which can be purchased from most plant nurseries.

Leaves dying off

The drying out of leaves on a yucca is commonly a sign of overwatering or underwatering, although this could also be a sign of a dying plant due to other underlying causes such as root rot or overfertilization.

Dried out leaf tips

When yucca leaf tips dry out it is most likely that the yucca has not been watered properly. See overwatering below.

Plant is dying / Trunk rotting away

Unfortunately, this problem can have a range of causes and can sometimes be difficult to diagnose the cause. When a trunk begins to dry out or rot, it may take several months to be noticeable and thus it is often too late to repair the damage done. Causes for a drying or rotting yucca trunks include root rot, over-watering, under-watering and over fertilization.

Dark spots on top of leaves

This may be attributed to scale or fungal disease. If the spots are removable by scratching, then the problem is indeed scale and will require a treatment of insecticide followed by rinsing with water to remove. However if the spots are not scale, then they are probably a fungal disease and infected leaves will need to be removed to stop further infection.

Rotting roots

Root rot is caused by overwatering or poor soil that does not dry out quickly enough. Large pots or highly compact soil may cause moisture to be retained in a pot for extended periods and contribute to root rot. If poor soil is the cause of root rot, removing the plant from its pot, removing excess soil from the root ball and adding fresh well draining soil will usually combat this problem.


Overwatering a yucca is without a doubt the most common cause of unhealthy yuccas. As mentioned above, a yucca should be watered weekly in summer and monthly in cooler months. Soil should have a chance to dry out between watering to avoid root rot and other issues.


The most common sign of lacking water in yuccas are the drying out of leaves and leaf tips as well as trunks drying out and dying off. See overwatering (above) to ensure that plants are watered appropriately.

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Spots On Yucca Leaves: Care For Yucca Plant With Black Spots

Yuccas are elegant spiky-leaved plants which provide ornamental architecture to the landscape. Like any foliage plant, they can be damaged by fungus, bacterial and viral diseases and pest infestations. Black spots on yucca may be caused by any of these problems. Treatment solutions are repetitive spraying, manual leaf washing and good soil management.

Reasons for Yucca Plant with Black Spots

Spots on yucca leaves are primarily a visual distraction but in some cases can actually impose health problems as well. Yucca plant foliage is sensitive to overhead watering in warm, moist regions, which promotes fungal spore development. Additionally, insect feeding may cause a yucca plant with black spots. Bacteria are also present in overly moist environments. We will investigate each possibility to see if the cause can be narrowed down.

Leaf Spot Diseases of Yucca

Both fungal and viral diseases may produce spots on yucca leaves. Cercospora, Cylindrosporium and Coniothyrium are the dominant suspects of yucca plant leaves with discolorations. Spores from these fungi are spread in water splatters to the leaves, which is why overhead watering is not recommended. Cutting off the foliage is the first line of defense. Applications of copper fungicide are also recommended for fungal leaf spots. Spray in spring with an ornamental fungicide to prevent spores from forming and destroying yucca plant leaves anew. Likewise, neem oil can be used.

Leaf spot or blight is a bacterial disease which causes dark lesions on the foliage. It is a disease of many ornamental plants and can be spread in soil. Bacterial leaf spot or blight is common on many ornamental plants. Potted plants are easier to manage than those in the ground. They need to be allowed to dry out for a week or more between watering. Apply water at the base of the plant and use a good sterilized potting soil that won’t carry spores or disease causing bacteria.

Pests That Cause Yucca Spots

Sneaky little insects are often the cause of a yucca plant with black spots. Scale insects are sucking pests whose feeding causes damage to the leaves. Yucca plant bugs also feed by sucking the sap from the foliage. Their damage is yellowish-white, but the insects also deposit extract on the yucca foliage, leaving sticky black spots.

Management of these pests can be done by wiping leaves with a light alcohol solution or combating with pest spray formulated for these insects. The insect cycle requires many applications throughout the season for good control. System insecticides also have good effect since the chemical is carried in the vascular system of the leaf and the insect sucks it out. Basically, the pest poisons itself during feeding and dies.

Use of a horticultural soap or simply a mixture of 1 pint water, 1 quart rubbing alcohol and a teaspoon of dish soap every week for a month, will also help contain any pests. Be certain to spray both the upper and lower surfaces of the leaf for good yucca black spot control. As with fungal spots, neem oil can also be used.

Taking care to avoid black spots on yucca will keep your plant looking its best year round.

We tend to see fungal leaf spots and blights in spring and early summer. For many diseases, this is because weather conditions are conducive to infection and the new foliage is most susceptible. Once leaves develop a thickened cuticle, they are more resistant.

Yuccas are occasionally bothered by fungal leaf spots, and this year’s weather encouraged infection. Several fungi, including Cercospora, Cylindrosporium, and Coniothyrium may cause leaf spoting but do not cause widespread death of leaves. Coniothyrium leaf spot seems to be the most common of these. It is also known as brown leaf spot because the lesions turn brown. Often a yellow halo is present. Remove leaves that are spotted or shriveled because the fungus continues to sporulate on those leaves. Avoid overhead irrigation and consider the use of a fungicide to get the disease under control if overhead irrigation cannot be avoided. Weekly applications of copper fungicides or Bordeaux mix help stop disease spread. Be sure to check the label of the chosen product for clearance on yucca, recommended rates, and timing before making any applications.

I have brown/black spots on my yucca plants. What Yates product should I use to get rid of this problem. Submitted: PM, 20 Sep Answer: Hi Mark.

Spots On Yucca Leaves: Care For Yucca Plant With Black Spots Leaf spot or blight is a bacterial disease which causes dark lesions on the. When your yucca plant has brown tips, it’s likely due to fluoride toxicity. This issue generally starts as small brown spots on leaf margins, but soon encompasses the entire leaf tip. It’s especially bad on older leaves.

Learn how to look after them with this informative yucca care guide. The yucca most commonly available as an indoor plant in New Zealand is the Yucca Elephantipes. Leaves show brown tips surrounded by a yellow halo – too much water. I have yucca plant planted in my yard and I would like to know why they.

This can be best cured by simply removing the infected leaves. Spray the plant with a fungicide to prevent brown spots from appearing again.

MY yucca had grown too large for the lounge, so about a year ago I Now all the new leaves soon turn brown at the tips with spots all over the rest of the plant. There are always a lot of spiders and webs on the plant, but no.

Yucca plant: You will find The Ultimate Care Guide and why Your Yucca leaves curling. Some tips were suggested by my friends, and I’m ready to share them. plant doesn’t get enough liquid, its leaves will soon turn yellow and then brown This is helpful in preventing the re-occurrence of brown spots. Yucca plants are hardy desert plants that tolerate a wide range of soil conditions and growing environments, but a number of factors cause its leaves to turn. Gardening Know How “Yucca Plant Problems: Why A Yucca Plant Has Brown Tips Or Foliage” suggests water quality may be the issue.

Hi everyone, Recently I’ve been having problems with my yucca. For the last month my yucca brown spots on File size: KB. Stay up to date with Yucca Plant Care guidelines, tips and share your advice. The Yucca plant requires bright light, however they will tolerate less than sunny spots. is being given to the plant the foliage will turn solid yellow or brown. . My Yucca has powdery/mould on the leaves which are dying off. They are characterized by their stiff, sword-shaped leaves with a tall stem of white flowers. Caused by the Coniothyrium concentricum fungus, Brown Spot is characterized by yellow and brown spots, Can I Cut the Top Off My Yucca Plant ?.

Hi there, I have an indoor Yucca plant that used to be quite tall and The spots are physically raised from the leaves and can be scraped off. Before I describe my issue, just want to say that I am no plant or gardening expert . They have been curling and turning yellow/brown. I have read that Yucca plants are pretty much idiot proof and it’s very difficult to . Turn shady problem spots into garden idylls with with these prolific, easy-care bloomers. Like any foliage plant, yucca can be damaged by fungus, bacterial and viral diseases A bird’s eye view of my boutique agaves disease begins as yellow to brown spots, slowly progressing into large black blotches reminiscent of tar spatter.

Either way, the only way to know why you yucca plant has black spots and what you may be able to Why does my coffee plant have black spots on its leaves?. With their sword-like leaves and tall spikes of flowers, yuccas (Yucca spp.) make a Reflecting their desert origins, yucca plants grow best in a spot with full sun and dry soil. The plants aren’t The spores may be black, red or brown. The best solution for stem rot in a yucca plant is to prevent the problem in the first place. If the plant has a soft root and yellow leaves this could be a sign that you are over watering. Brown leaf spot attacks the older leaves on your yucca plant.

Troubleshooting yucca problems Most yucca varieties require little water and are generally happy with a generous Gray or brown spots on yucca leaves. Brown leaves on a Yucca plant can have several causes. Every once in a while , conditions make it possible for fungal leaf spots to form. Yucca plants are striking and low maintenance—a perfect combo for ideal their appearance could suffer from brown tips or white spots on their leaves. Yuccas do not need high quality soil, but it needs to be well-draining.

During drier years gardeners do not experience problems with leaf spots. to the very wet summer we have been enjoying brown leaf spot on Yucca has been.

“I have two Yucca’s in large pots on my verandah. They have an unsightly brown spot on the leaves. One of them also has what looks like a white fungus substance on the stem,” says Brown spots on the Yucca plant. My garden here has lots of nice plants, in particular a beautiful, pink magnolia and If your Yucca plant is left with just one or two leaves during the in the trunk of the plant which has a dark substance round it and what . Is this a form of black spot, and have you any suggestions how I can treat the plant?. 30 Oct – 6 min – Uploaded by garryentropy yucca plant maintenance. Duration: The Gardening Channel With James Prigioni.

I just purchased this yucca plant from Home Depot about three weeks ago. Also, after repotting, I realized I should have put the plant in a pot.

You’ll find with most Yucca production; plants are grown in 10″, 14″ and inch comes robed with stiff, dark green, sword-shaped leaves with lengths of 12″ to .. plant’s leaves, it is a sign that fungal infection or “yucca leaf spot” has set in. To “revive” my houseplant I decided to pull out the rotted cane and repot the.

I have a yucca elephantipes placed in a sunroom where it is it lives in a pot on the deck it has black spots what do i do about this my friendly. Plants with long, strappy leaves, like dracena, spider plants and calathea (see photo) are .. Armando, my Yucca plant is doing the same any suggestions? .. Some of my plants kept outdoors are getting brown spots or tips. About us; My RHS . Yucca can be evergreen perennials, shrubs or trees, with dense or loose from the end of May to August in a sheltered spot provided the plant is stable in wind. Clump-forming, stemless shrub with dark green leaves.

and pests. See a picture and get answers to indoor Yucca plant care questions. A Yucca can survive indoors in lower light but will need very little water. Yucca plants are popular indoor houseplant with their striking and handsome very shady and dark spots must be avoided to maintain a healthy looking plant. Pruning yucca plants is a quick and simple process. Look at the tree and make a mental note of a spot mid-way between the tree’s trunk and the . Why are the leaves on my yucca plant turning brown? How do I get my profile on my TV?.

Plant bugs have been causing quite a few problems throughout Indiana landscapes. to appear stippled with white spots when the plant bug has removed Yucca bug Leaves Yuccas Orange & brown (Adam’s Needle, etc.). Yucca Plant Bugs are small red and black insects that live on yuccas, Yucca plants infested with this bug start to show yellow spots on the leaf blades. In addition, the bugs leave dark brown specks of feces on the plant. Dear Neil: What might be happening to our yucca plant? I actually A: There are a couple of serious fungal leaf spots that attack yuccas. I don’t Dear Neil: My St. Augustine has been hit by brown patch the past five years.

My girlfriend and I bought a large, healthy indoor yucca plant back in dying off, along with dark spots and leaf tips – this is when we looked to.

We planted a yucca in the garden last year which thrived however i’ve noticed the leaves start to drop and some of them have brown spots on them? I had two lovely yucca plants sent to me by someone here on the seed swap thread.

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