Hi estación seca
Long time since have looked at neem oil. It was back in the early 90's.
Big stand out is neem oil is used as a contraception medication in India for centuries. Neem oil is more than horticultural insecticide. It was a new product back in the early 90's with lots of new issues to be sorted concerning treated by this oil.
Your scale must of been doormat in the soil mixture incomeing.
Doing a search surprisingly shows very little about this product. When it had so much potential back when I had contact buying weed, pests & diseases spraying poison's for the city council that I was a multidiscipline horticulturist supervisor for around 120 people.
Search says, no more than we already know. eg "Regardless of the type of plant being treated, neem oil can damage plants by burning their foliage. Do not use on recent transplants or otherwise stressed plants. Though plants must be completely covered with neem oil for the pesticide to be effective, it is a good idea to test the product on a small area first."
Am very interested. Had totally forgot about neem oil as am concerned about using insecticides to kill ants that are nesting in my Tillandsia & Platycerium clumps etc that could past-on the poison, to a plant buyer.
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