Outside, in my area, the main pests, are Leafhoppers. They have been spreading an infectious Phytoplasm, for the last 10 years, in E Ky. Sometimes they grow out of it, but generally, it either sevelely stunts the plant, or outright kills it.
It starts in the growing tips, right around when plants start to transition from Veg-Flowering. At first it is a slight Purple, then it spreads into the stalks/stems, turns p deep purple black, and then kills the plant, or really fucks it up. Or even possibly, grows out of it. Though, its recommended to trash the plant, and dont touch any other plants, as it is easily spread.. Leafhoppers are like ants around here, and nothing short of nuking them, will eradicate them. They have been responsible for up to 80% of several buddies crop losses, since 2010.
And these people have been growing weed, since 1970, and this is something never seen before. It has also been reported on this forum, and several others, and has been seen from Hawaii, to South Africa. Phytoplasm was first identified in Hemp, in Iran, in 1967, and was predicted to spread, world wide. Same plants inside, never get it. Ive never seen this on any indoor plant, since 1977, when I first started growing INDOORS. with the 1st HID/1000w Halide. Outside, you can count on it, and is making it all but impossible to grow in my area, though, last year we did get a reprieve, and only a few, vs 300 got it last year.
Bugs/Virus/Bacteria, will eventually rule the world. Humans are living on borrowed time.