What are the reasons for “yellowing” cactus

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some cactus start to turn yellow near the bases. Mostly this happens after 4 years of life. The lower part of the stem becomes rough, a plaque of a yellow-brown tint appears. If there is no ulcer under it and the base of the cactus is solid, then nothing wrong happened. Otherwise, these are the signs of developing rot. To correct the situation will help feed with complex fertilizer and create the most favorable conditions. As a last resort, it is necessary to transplant into a better soil mix. In the first case, it is necessary to treat appropriate acaricide, in the second – to adjust the amount of water and to protect the plant from hypothermia. Even experiences with experience make mistakes that lead to irreparable consequences. Only strict adherence to all cactus care rules and timely prevention can prevent disease.