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Uhh I think you might be getting 'buffering' and leaching mixed up. Are you saying the PH of the coco is not correct? You should always use coco that has been THOROUGHLY FLUSHED/LEACHED. They sell coco that is flushed when you buy it and ones that are not flushed (they are cheaper) If it hasnt...

Make sure you take a pic before you kill it though. it could always end up as a problem sometime in the future for you & you cant do shit if you cant ID the pest.

Aphid I can only see one cornicle though & its really really small so im not 100% on this. Especially since there on the floor. Can you double check the plants and let us know if you find any on the underside or stems of any of the plants? Could also be a root aphid.

Thats a moth fly :) Its a dipteran (only 2 wings) but fuzzy and looks like a really small moth. There not that big of a deal But to get rid of them remove ALL standing water and dont let your plants stay saturated/over watered etc They can be an issue in houses/bathrooms that have a sink or...

Mind posting the source of those pictures? if there not yours. The second picture of the adult female looks more like a heteroptera hemipteran than a thysenopteran Thrips have rasping sucking mouthparts not a long proboscis like the one in your picture & i dont see an ovipositor. It could be a...

Ants will farm & protect the aphids. Its a mutualistic relationship. aphids are phloem feeders, sucking up mainly sugar. Because they constantly feed from the pressure of the phloem they excrete honeydew while they eat. its their waste but its pretty much 99.99999% sugar. The ants eat it and...

They pose no real risk at all......... its a plant, no matter what you do your going to end up with both pests and beneficial insects on it. (as well as fungi and bacteria) There is no way to practically avoid it.

You can use biological control for thrips beneficial insects such as amblyseius or Orius insidiosus (also a general predator but mainly used for Thrips control) The pictures do look a bit funny though. Western flower thrips are more of an orange/yellow color.

BTW those look like beneficial PREDATORY mites. not bad spider mites such as two spotted etc etc. They look like Amblyseius or persimilis. They predate on eggs and thirps larvae blah blah. Ur bads mites will look something like this IE two spotted spider mite the spots are from feeding on...

Its soil not dirt. & its composted plant matter not fermented/amplified/incubated inside the earth.

Post a picture of the plants & the damage done. Is there any webbing? Keep looking with a microscope, they might only be on a few spots on the plant etc if you find any go look for a picture of a similar mite and post it up. What stage are your plants in? There are several options for...

DO you have a picture of them? how big were they? how many legs? did they look like mites/spiders? Always post pictures when you want an ID of a pest.

Pictures would be awesome http://en.wikipedia.org/wiki/Lepidoptera there Caterpillar larvae or lepidopteran larvae is it a looper similar to this or a tent caterpillar? idk how dense the webbing is... There are what, over 115,000 Lepidopteran species in north america sooooo not good odds...

Probably but im bad with deficiencies phosphorus deficiency is usually purple ish in most crops

Not a good idea.

Its mostly large & FAST drops in temp that will mess your plants up. If the temps have been slowly dropping and the plants dont show signs of stress you should be ok. its by no means ideal though. Uhh mind mentioning why the room got to 19f (-7C) ? & for how long lol & was it a sudden or...

Its a nute problem. Its a deficiency in a mobile element thus the chlorosis appears on the lower leaves because the element (fertilizer) is being moved up the plant where it is more useful.

Where is your exhaust fan? You want to vent air out the top of your canopy and intake on the bottom/middle.

Nutrient burn typically starts from the tip and edges and works inwards. For example this is sun burn And this is nutrient burn If its only one small spot on one leaf don't worry much about it. (your temps might have gotten a little high, or the leaf might have come in contact with a...

The first picture of the 'black bug with white wing that can fly' is orius spp (common name minute pirate bug) its a beneficial, you should be happy to see it. There a general predator so they eat just about anything if they get hungry enough. There preferred pest is thrips. The second one is...