Are the newly affected leaves slightly shiny?
If so you have Thrips.
Mix soap and water and spray the plant. I have actually hand washed every leaf of a plant and it didn't hurt it.
If that doesn't work, soap+99% rubbing alcohol. Spray on the leaves, leave for a while, wash off the leaves.
I have been preparing the plants for SCROG or some sort of separation. Since I still want them to grow upwards, I LST on the secondary growth and keep the sideways pointing branches under the node as support. I was doing regular LST until I accidentally discovered this method.
With this way...
I'm thinking of SCROG but I want the plants to get tall to maximize the light use. I think the screen should be put once they are at the height I want?
I was surprised how busy the plants got when fluorescent is supposed to be weak?
I just hope my big nice one isn't a male, it was planted earlier as a test of my lights before I did the rest. I'm hoping at least 2 of the 5 are female.
I don't have a budget, I will buy anything as long as the...
Phosphate, Potassium, and nitrogen deficiency can also cause the tips to look burnt. Although without knowing OP feeding we don't know anything.
http://www.thefieldposition.com/wp-content/uploads/2012/06/12cpo07a3f1.jpg
Useful for identifying some issues.
Chocolate kush closet grow. 100% CFL. 100% dirt. 100% aluminum foil. Pretty much cheapest possible.
Dissolved MG month feeding sticks for food.
Using 4 long FL bulbs and 2 CFL on top.
Just put them into flower, any suggestions for nutes?
I will replace the two white light bulbs with 2700k...