Please help!!! First time grow and my babies are dying

Okay, I have four plants that have 3 nodes with 3 leaves each and 2 nodes at the top starting to form and are alittle over 3 weeks old from sprout in in 1 quart pots of 1:1 perlite, spag peat moss, composted manure, and verlite, with some worm castings on top. I am watering with superthrive and root

Anyways I watered with 2ml/gal fox farm grow big (1/4-1/3 strength on thursday. Last week we got a good stretch of sun mid week and the plants grew a lot. I checked them on sat and they seemed to be doing very good. I noticed there were some brown spots on the leaves on one plant. They were barely noticeable and i didnt see anything under the leaves. i watered on monday evening with the fert since they were doing so well. I noticed there was some browning on 2 other plants, the older one being the worst in respective order for all 3. also, the first plant to show symptoms had a hole in its leaf where the brown spot was. We got some rain the previous night so they were pretty wet. Here is a picture of the worst plant yesterday below. I have been hitting these with safer 3 in 1 spray every other or 3rd day unless it rains then the next day.Today i went to check on them and they looked like they are dying this morning. THe leaves on all of them are browning and there are a couple holes. One plant's leaves are curling inward and up. THe tips are very brown on the first plant. They can barely hold themselves up. I think I have a very bad spider mite problem... i saw them under the elaves a lot today. THis afternoon they were looking a little better from sun, but they were still bad. I hit htem with pyrethrum/neem oil and superthrive. THe soil has been wet for the past 3 or 4 days... idk if that could cause any of this. basically, if this is just a spider mite problem, do you think my plants will live? They look much worse than the one in the picture, they just have the same problems. THe hwite shit is derm. earth.

Hey man it sounds like a little too much for that little baby. I would cut out the nutrients, the superthrive, the watering, everything.
At that young stage all they need is time. Make sure your water is ph'ed to 6.5 and wait until the soil dries out completely before watering again. You can pick up a cheap moisture meter from the local walmart.
When my girls are that young, I only water them 1 time a week, if even that often. Good luck

bugs huh, I dunno about spider mites but fungus gnats will burrow and lay their eggs and the larvae will eat the roots. Sounds like your mix is pretty organic, so its prolly the mites that are killing em, if not the chemical insecticides you used (i dunno what safer 3 in 1 is)

those white spots just look like dried nutes all over the plant to me...
You don't want nutes this early that much I'm sure everyone here will agree on.
..and when you do start using nutes, you don't want the water to come in direct contact with the plant. pour it on the soil only.

the white shit is just dermiteous earth that got blown in the wind when i was sprinkling it. I only fertilized on friday and monday at 1/4 strength. the root juice is pretty harmless i think... it says to use it from seed and the grow shop said that its fine to use it when theyre tiny before they need fert.

Im just hoping the spider mites or bugs are the only problem. Can cannabis make a recovery easily? Because they arent looking very good. Theres no spots that are completely dry and dead but its just weak and brown, with curling leaves and burnt tips.

if the bugs are gone.

at 3 weeks .. u should have more growth ........ check the soil pH