The cactus gets this kind of fungal rot when it is still a young plant. In contrast to other species, this mold, which is brought on by the fungus Drechslera cactivorum, can completely obliterate a plant in as little as four days. The illness begins as yellow spots that quickly become brown and spread, depriving the cactus of water and covering it in spores that are a dark brown color.
Method #1: Cut Off The Infected Area
To start, use a sterilized knife or pair of clippers to remove any patches of fungus on the cactus plants.
Then, depending on the fungicide you use, treat those healthy areas once every two weeks for six to twelve months.
Follow the directions on the fertilizer container to fertilize your plant as necessary to encourage development and stop further disease outbreaks.
Additionally, make sure that it receives consistent watering throughout this time and try to avoid letting it become completely dry in between waterings since too much moisture may result in black patches in addition to root rot issues!
Method #2: Use Baking Soda and Hydrogen Peroxide
Making a solution of baking soda (sodium bicarbonate) is one of the most used techniques.
Pour two teaspoons into an empty spray bottle along with one quart of warm water.
Whenever you notice any indications or symptoms, such as leaf spot, that fungus on cactus plants has resumed its attack, spray your cactus plants well until they are completely moist, including the undersides and tops of leaves.
For six weeks straight, you should perform this procedure at least twice a week to completely eradicate the fungus on your cactus plants.
Method #3: Make Your Own Fungicide Solution
In an empty spray container, combine one tablespoon of liquid soap, hydrogen peroxide, and baking soda with one gallon of water.
To totally get rid of fungus on cactus plants, spray it abundantly onto your plants every two weeks for at least six months!
Method #4: Spray With White Vinegar Solution
Another choice is to carefully dip the leaves into a solution of one part white vinegar (or apple cider vinegar) to four parts water in an empty plastic bucket or container. Do this until the leaves are completely moistened but not dripping wet.
The fungicide that has remained on the surface should be allowed to dry naturally rather than being rinsed off because doing so will only remove around half of it. It is therefore better to leave it alone.
This remedy must be used within a week if it is homemade. If you purchase it, be sure to keep it in a dry, cold environment.
Method #5: Clean Your Cactus Plant Thoroughly With Soap and Water
The easiest option is to just give your cactus plant a thorough washing every day, or at least every other day, with soap and water, especially after working near them while they are dusty.
Before applying fungicide using method number three above, make sure to clean up any dust since it acts as an insulator to prevent fungi from drying out.
Spray two quarts of lukewarm water with one tablespoon each of liquid soap, hydrogen peroxide, and baking soda to clean all leaves, including the undersides.
Method #6: Use a Fungicide Solution
Fungicides can be used to treat your cactus plant if it develops a fungus infestation.
Fungicides come in a variety of forms, some of which function better than others and serve distinct needs. Be careful to pick the proper one for your situation!
Keep in mind that even if just one or two leaves exhibit symptoms, it is still crucial to spray them down because, if left untreated, this disease will soon spread throughout the entire plant.
Can you keep a cactus from molding?
While skin-deep disorders in the upper body of the cactus can be easily handled, those that have spread to the roots typically result in a plant that is slowly dying. Excision of the diseased tissue works successfully for the majority of cacti. Dig out the damaged flesh with a clean, sharp knife, then let the hole dry out. When the wound is healing, avoid overhead watering.
There is not much you can do if the roots have been affected by the harm. You could attempt to repot the plant by removing the unhealthy soil and adding sterile soil in its place. Before replotting the roots in a new potting medium, thoroughly wash the roots out.
Taking cuttings and allowing them to grow roots for a brand-new plant is another way to salvage a mushy, soft cactus. Before inserting the cutting into the sand, let it a few days to callus over. The cutting may need to be rooted for several weeks. A healthy cactus that looks exactly like the parent plant will be created using this method of propagation.
On the cactus, what is the fuzzy material?
We apologize, but Mr. Smarty Plants needs some time to catch up after receiving an overwhelming amount of mail. Soon, we hope to be taking new inquiries once more. I’m grateful.
ANSWER:
Before, Mr. Smarty Plants responded to a query regarding cholla cactus cochineal bug management (similar to your prickly pears). What Larry and Brigid Larson wrote is as follows: Cochineal feeding can harm the cactus and occasionally result in the host plant’s death. The Cactus Doctor talks about getting rid of cochineal. Their advice is as follows: 1) A hose with a power nozzle attached to the end. 2) It was advised to clean the affected areas with insecticidal soap or unscented dish soap to treat them if the infestation gets out of hand. Neem oil was also mentioned as a possible natural remedy.
In response to another Mr. Smarty Plants query about cochineal bugs on prickly pear cactus, Nan Hampton provided the following response. (As you can see, this is a common query.) It sounds like cochineal bugs are infesting your cactus (Dactylopius sp.). They are cactus-eating small scale insects. They generate fluffy white wax that covers their body as they consume the cactus and shields them from predators as well as the weather (especially drying out). The fluffy wax also acts as a sail or balloon to carry the bugs to a fresh cactus patch in the breeze. The carminic acid that the bugs create aids in shielding them from predators, particularly ants. Indigenous peoples of southwestern North America, Central America, and subtropical South America have been using this bug’s carminic acid for centuries—possibly millennia—to synthesize a vivid red dye that they utilized to create exquisitely colored fabrics. Cochineal bugs were formerly only found in the New World. The cochineal bug spread around the world when European explorers came to a place and saw the stunning red cloth made by the locals. Although they have also been employed to help reduce cactus populations, the need for cochineal bugs decreased when a synthetic red color was created. But recently, there has been a resurgence of interest in cochineal bug cultivation for red dye because it was discovered that synthetic red dyes can have harmful side effects on health. Today, food coloring and cosmetics both employ the bug-derived dye. Because of this, managing cochineal bugs hasn’t really been a top concern, and as a result, I haven’t been able to discover a lot of information on managing them. If you only have a minor infestation, I advise scraping them off (slowly, to avoid the cactus spines) and throwing them away. They might also come off with a water under pressure wash. To ensure that you don’t harm your cactus, test a tiny area first. Then, collect and get rid of any insects that you wash off the cactus.
The University of Arizona Extension also suggests a similar set of remedies in a publication on cactus diseases.
The usage of insecticides was discussed on multiple websites, and Wikipedia included several natural predators: “The population of the bug on its cacti hosts can be lowered by a variety of natural enemies. Insects appear to be the most significant group of predators. Numerous parasitic wasps as well as predatory insects including ladybugs (Coleoptera), different Diptera (like Syrphidae and Chamaemyiidae), lacewings (Neuroptera), and ants (order Hymenoptera) as well as pyralid moths (order Lepidoptera), which kill cacti, have all been identified.”
Here is more information on the intriguing world of the Dactylopius coccus cochineal scale insect and the carmine dye that was highly sought for fabric dyeing in the 15th century.
What exactly is that white growth on my cactus?
All of us enjoy the colors found in nature, especially at this time of year, but none are as brilliant as red.”
Red has always been a popular hue in societies because it is associated with risk and bravery, revolution and conflict, violence and sin, desire and passion. (1) When Spanish conquistadors discovered the Aztecs selling an exceptional red dye in the major markets of Mexico in 1519, no red dye was as vivid. They referred to it as cochineal or grana cochinilla.
“When Cortes arrived, he was astounded to see Montezuma and other lords wearing bright, vivid red robes. The fact that the hands and breasts of the native women were painted the same vibrant hue astounded him as well. He discovered bundles of dried cochineal brought to Montezuma in Tenochtitlan (now Mexico City), which were swiftly conveyed back to Spain. The dye was so much more vivid than the others and became very popular in Europe. By 1600, silver was the most expensive import from Mexico, followed by cochineal. (2)
The Opuntia engelmanii, or prickly pear cactus, is home to the scale insect known as cochineal. It eats the cactus’ delicious juices as a rasping, sucking insect. To ward off predators, it creates a cottony white covering. The insect is removed from the cactus, dried, and dehydrated before being exported all over the world to be used in a variety of ways. Cosmetics, food coloring, artist’s paint, and textile dyes (such as wool) all use dried cochineal. Today, it is frequently utilized as a red colour in dietary beverages. Cochineal’s most well-known application was to colour the jackets of the British troops “During the Revolutionary War, redcoats.
Live cochineal are displayed to children in the City of San Antonio Natural Areas Education Classes on the cactus, and dried cochineal is used to paint on rocks, paper, and wool fibers. While dried cochineal is still available today, synthetic colors with longer shelf lives have mostly taken its place.
The scientific study of the interactions between people and plants is known as ethnobotany. Cochineal is a fantastic technique to demonstrate to students how plants and insects were used by Native Americans and early settlers in Texas. They discover the history of this insect as well as its link to and relationship with nature. The pupils enjoy reading the ingredients list on their preferred red food product and seeing the name of cochineal extract (labeled as carminic acid) “use Sobe Life Water, a bug juice.
How can you spot a dying cactus?
When a cactus looks shriveled and husk-like, it is dead. Additionally, dead cacti can become unstable in their soil and topple over. They could start to smell rancid and becoming mushy, both of which are indicators that they are rotting. Cacti that are dead lose their spines and frequently appear brown.
How can I tell whether the cactus I have is rotting?
To identify the issue in its earliest stages, you must be aware of how cactus root rot looks.
The most typical signs of root rot include:
Cactus Stem Discoloration
Cacti will exhibit blatant evidence of cactus stem discolouration if root rot is not treated.
Root rot can cause cacti to start losing their vibrant green hue and turning yellow or brownish.
Disintegrating Plant Tissue
Because diseased roots drop off and expose the cactus core to air, root rot-affected cacti frequently contain plant tissue that is dissolving.
Once it is exposed, it can soon dry out, causing the dead tissue to separate from the plant’s living tissue and leave a hollow space in its center cavity.
Mushy Cactus Roots
This is because the infected cactus core swells and begins to fill the central cavity of your cactus plant, where its stem attaches to its roots, as it becomes infected.
In time, this swelling may rupture, allowing dirt, water, and germs to enter the interior of your cacti and do further harm.
Soft or Discolored Spots on Cacti Stems
There may be a strong possibility that your cacti have cactus root rot if you observe soft or discolored areas on any portion of the stem.
If left alone, rot can soon spread to the cacti spines and cause them to lose their brilliant color. In many cases, these patches will also seem waxy.
Weak Cacti
Cacti that have cactus root rot frequently lose their vigor and become frail, which can make them collapse or fall over.
Even when cactus are adequately watered, they may still tumble over since they will become very tough to support.
Black Rot on Soil Surface
A symptom that your cactus plant’s roots have contracted cactus root rot and may be dying off is the presence of black spots of dead soil close to the base of the plant. As a result, the soil around your cactus plant will begin to disintegrate.
Dead matter has accumulated around the base of your cactus or cacti, where molds and other fungi start to proliferate as they degrade.
Yellowing Cacti Spines
Because disease frequently affects the cacti’s spines, cactus root rot can cause cacti to lose their brilliant color.
These yellowish spots may also form on the cactus’s spines that are along its stem or on any other portion of your cacti plant when it becomes diseased.
Wilting Cacti Spikes and Buds
Wilting buds and spikes are another sign of root rot that is frequently present. This virus could spread inside throughout the entire plant if it is not treated, severely harming it.
You should be aware that even if you address surface signs right away before cactus stem discoloration becomes apparent, once interior components of a cactus get damaged by root rot, they cannot be rescued.
Internal Decay in Cacti
This illness causes internal disintegration and an increase in respiratory activity as a result of cellular degradation due to alterations within a cacti’s circulatory system.
Any attempts at treatment at this point in the disease’s progression will be ineffective, even if they are started right away after identification, unless all damaged roots have been cut out before additional harm has been done.
However, as was already noted, cacti with root rot will immediately start to exhibit cactus stem discolouration after the internal cavity has been revealed.