Hi all, I have an infestation of some sort of black sesame shaped pests under chilli leaves. I suspected they were aphids of some sort, however, as I am new to this I am not sure. I am puzzled as to why they do not move about (ie they stay stationary even as I remove them with my fingers. I am used PestOil and castile soap sprays. As they don't move, or detach themselves/drop dead when I spray them, I am not sure how effective those sprays have been. Size-wise, they are around 1mm. Please let me know what they could be.