enter image description hereIve had this cactus which i think is a Pachycereus Schotti/Monstrosus since years and its been growing fabulous. Ive just recently noticed it acquired some brown scales (non Insect) and looks like theres something wrong. Could it be from some chemical reaction? I did spray some Neem oil on several plants around it?? I loved this cactus and would hate to see it die. Help! Thanks!

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    Scales is not good, can you make a picture of the situation to be sure of what's going on there? – benn Sep 3 '19 at 11:22
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    Just sent one with the scales. – Desertbum Sep 3 '19 at 11:25
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    Could be bacterial or fungal infection, but I am not sure. Could you tell more about its environment? Is it grown outside? What climate? Are there other plants next to it? I am not a expert in cactus diseases, but I hope someone can help you here on this site. – benn Sep 3 '19 at 12:39
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    Firstly, it's not a P. schottii monstrose. Those are spineless. It looks like a Cereus peruvianus monstrose. – Tim Nevins Sep 3 '19 at 16:25
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    As far as the damage is concerned, assuming there hasn't been any recent frosts, this looks like environmental damage. Neem oil doesn't seem likely. Was the neem oil diluted? Is the damage equal all around or is it only on one side? Whatever it is, the cactus probably won't die, but it will never look the same. Cover the soil and rinse the plant thoroughly in case whatever burned it is still present. You don't want the rinse water going into the soil. – Tim Nevins Sep 3 '19 at 16:28

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