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As the days get shorter and the periods of strong sunshine lessening , the microclimate you have at nursing home will also interchange . This fault might mean watering yourcommunity of cactimuch less and devote close attention to switch in humidness that can bear on your desert - dwelling plants . alas , these variable can sometimes stimulate brownish spots on your cacti , which ask a little detective work to name .
The rationality for brown spots on your cactus can vary greatly , depending on the indoor environment , access to light , and your charge routine . However , not all brown spots on your cactus are unsound news . It ’s authoritative to notice that dark-brown smirch can indicate " corking , " which is a natural part of the cactus aging cognitive process and is n’t cause for alarm . Here are four of the most plebeian reasons why your cactus might have dark-brown daub .
1. Root Rot
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If you notice dark-brown spots at the bottom of your cactus that are slowly beginning to spread , root rotis probably the issue . Root hogwash can occur for several cause , including overwatering , soil that is n’t well - drain enough , and deficient lighting . As a general formula of pollex , stick your index fingerbreadth into the soil about 2 inches deep – if it ’s teetotal , your works needs a potable . On the other paw , if the filth is soggy , your plant might need more sunlight .
As cite above , corking sometimes award as brown position at the bottom of the plant . Corking is a natural part of the aging cognitive operation for your cactus and requires no discourse . It ’s a alteration in the plant ’s cuticle ( out layer ) that looks like brown spots paired with the thickening of tissue .
While it wait similar , the difference between corking and root bunk is in the texture . Corking looks like firm , bark - like tissue , while root bunk is indulgent and mushy to the skin senses .
Pro Tip : A funky soil smell is also an indication of radical putrefaction .
2. Cold or Sun Damage
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If you notice orange and brownish , rust - comparable spot on your cactus , it could be because of frigid legal injury or humidity floor that are too high for comfort . During the non - fighting increase time period , your cactus should be in a shiny way with temperature of 40 to 45 level Fahrenheit . purport to keep humidity floor at 30 percent or less .
In the same vein , too much sun can also factor into brown spot appearing on your cactus . While it ’s hard to believe that your sun - worshiping flora could actually get too much lightness , it is possible that subjecting your cacti to high-pitched - chroma sunlight can be the causa of chocolate-brown or black bruises .
3. Pests
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If you feel that your cactus are root in well - drain soil , are n’t being overwatered , and are getting the good amount of sunlight , then the chocolate-brown spot might be due to gadfly . The comportment of spider mites or graduated table could make dark-brown spot on your cacti .
Specifically forspider mites , the first augury of these tiny invaders is webbing and small brown spots , specially on newer growth . There aremany waysto get rid of wanderer mites , let in using insecticidal soap spray on plants . Ensure to quarantine your cactus during discourse until you ’re sure the mite are gone .
As for scale , they face like tiny chocolate-brown spots on the plant . Upon a closer looking , scale has brown , noodle - shaped carapace that hang to the works but can be easily scrape or wipe off . An good way to obviate scale is to habituate cotton swabs and scratch alcohol to do by the affected areas . Quarantine and repeat treatment until the problem is lick , which might require a piece of forbearance .
4. Fungi
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Besides dirt ball , other opportunistic organisms to vex about are kingdom Fungi , which usually affect cacti live on in wet soil and extremely humid environments .
For example , the fungus Phyllostica , which depend like small spots of brown discolouration , usually affects the bristled pear cacti ( Opuntia species ) . If left unchecked , fungal infections can spread to other region of the cactus and eventually to other plants in the vicinity . If any healthy pads on your cactus are n’t affect yet , cut them off , permit the end dry exclusively to prevent putrefaction , and then replant in a goodly cactus soil mix .
Sadly , there is no cure for the Phyllostica fungus ; if the fungus spreads to the intact plant life , the best affair to do is dispose of your infected cactus .
Take Prickly Precautions
There are a fistful of reasons why your cactus might have browned patch . They can indicate too much or too little light , cold terms , overwatering , and the mien of pests and fungus . So often , it ’s a process of elimination and careful reflection to see what might be the perpetrator .
