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Before dealing with the other letters and what not, make sure that you are checking your pH levels which will determine how much nutrients your plant will be able to take in. Avoid soil testers which are inaccurate, but use a cheap liquid test, or if you can afford it, a digital one which will be cheaper in the long run for someone who like keeps growing weed on and on. Remember, blood meal and peat moss and other similar grow additives can throw off your pH. Also can adding nutrients so keep them around a level of 5-7 and a TDS range of 800-3000 PPM. For soil grows, keep a level of pH around 6.8 which makes it easy for all nutrients to be absorbed without being locked out. Other mediums should be around 5.8

manganese, nitrogen,phosphorous,potassium,magnesium,calcium, zinc, iron,sulfur,boron,copper, molybdenum,

Nickel is required by plants for proper seed germination Symptoms include chlorosis and interveinal chlorosis in young leaves that that goes down to plant tissue necrosis,poor seed germination and decreases in crop yield.

d

 Nopest  strips emit a powerful vapor that should only be used if you are not breathing the air they are in. Floramite is also very strong with harsh chemicals and should only be used as a last resort. It is expensive but effective. Bleach solution one tablespoon per on gallon of 95 F pH balanced water in mister should be used on plant and surrounding grow area. You can also use alcohol with 30% water or more. 

fungus gnats, aphids,spider mites,white flies,thrips,slugs

rabbits

White mold/mildew,bud rot

overwatering,underwatering,pH inbalance,