Recently I saw weird bite marks on one of my highland Nepenthes. I am horrible when it comes to IDing pests so I thought I'd ask what y'all think of this. The plant has been quarantined, but I'm still very worried. About a month ago I saw the same symptoms on my lowland Nepenthes but I was unable to find out what it was. I sprayed the lowlanders with 50/50 water alcohol to rid of whatever it was which seemed to work until they came back about a month later. Maybe a second generation of pests was able to mature? Does anyone have an idea as to what these are and how I could eliminate them? At first I thought it was mites, but I have not seen any when I tap the leaves onto a paper slit. They appear to spread like wildfire and I don't want to take any chances of them getting to the rest of my highland plants. The symptoms are as so: strange bite marks in the new leaves of the plants which look like worts/pimples from the upper sides of the leaves, deformed pitchers and pale leaves that are curled up abnormally when opening.
Here are some pictures of the infected plant:
The upper side of the bite marks which have formed like worts.
Underside where the bite marks appear to have been bitten
Paleness of the newest leaf
Any ideas to what it is and how I could treat it? I have not seen any webs so I can confirm that these aren't spider mites.