I had several small plants in the office (two orchids and a small cactus) that died. In a short time they began to dry.
Now a third orchid is beginning with similar symptoms and I wanted to ask what the reason could be:
The grey/black spot at bottom grows, the leaves becomes soft/burned and the the leaves fall off.
Looking at the picture I also noticed something that could be a small dead spider in the top left corner. Detail:
Could this be the reason? Do spiders harm my plants? What should I do?