That does not look like insect or fungal damage. As Sonya suggested, I would also agree that it may be natural, especially considering that the flower spike seems to be naturally aging.
The fungicide and insecticide are good to keep around, but I suggest only using them when you have a diagnosed pest or disease problem.
Here is a guide to diagnosing pests and diseases, including information on selecting the right chemical to treat specific problems:
http://www.houstonorchidsociety.org/...ySueBottom.pdf