Go to Lowe"s or any good plants store, hardware store and pick up some Neem Oil concentrate. You can but a one gallon sprayer for really cheep just about anywhere, use this for the plants, and if you stay organic you can cross treat without to much worry about contamination so only one sprayer will be needed. This Neem oil stuff is a very good general insect preventer, you will notice as you dig into this that most organic's work as preventers not actually killers. The neem oil coats the leaves and prevents the whole cocoon type thing and the insects entering the leaf membrane. Than later on you will need a spray for bud worm, damn I am brain cramping right now as to what the stuff is called! I know it is organic, an enzyme shoot, well someone else will chime in and let you know. Than depending on where you're growing you may encounter some mould problems later in the season, there are two ways to fight this, first cut out the mould, and be very very careful, cut the whole area out, don't try to cut around the mould, just get rid of the whole area. I know this sounds crazy but the more you mess around trying to just get the moldy parts the more you're actually spreading the mould spores. The second way to fight mould is to mix baking soda with water and lightly spray your nugs, just be sure not to spay when it is very sunny, this tends to burn your nugs. This is also very organic so don't panic, if your quick enough at catching the mould the baking soda will be long gone before harvest. And finally READ, READ, READ. Knowledge will set you free. Good luck with your grow, and remember share with those less fortunate.