Hi,

this opuntia macrocentra was healthy until 3 weeks ago when it started to have yellow patches on it. I sprayed one application of 70% neem oil formula. As I wasnt very sure if neem oil was the right treatment, a week later; I sprayed Baba Tehen Super Margosa a natural pesticide of another round of application.

Other than the patches, now the cactus looks weak and doesnt have the healthy green. I am not sure if its due to wrong pesticide used or the cactus condition has deteriorated. There is also a cut at the base which was hidden by soil when I inspect the roots.

Appreciate advise for the below:-)

What cause the yellow patches and the cut?

Am I using the wrong treatment?

How to treat the cactus now?

Thank you in advance!