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Plants are looking great. Some serious height this season. I am guessing they will be close to 10ft by harvest time. Looks promising for over a pound per plant.
BT Stands for Bacillus thuringiensis, a species of bacteria found in soil.
With regards to organic pest control, BT is commonly applied as a spray to prevent various types caterpillars/worms/larvae from infesting your buds.
BT is also the main ingredient in mosquito bits and mosquito dunks which are used to control mosquito larvae in ponds or standing water.
AFAIK, BT is safe, highly studied, and effective. I use it each year around flowering time and spray every few weeks till harvest.
One year I procrastinated on restocking my BT spray and had to rush out and get some when I saw some budworms on one of my plants. Luckilly, that plant was way farther along in flower than anything else. I lost about half the yield from that one plant but was able to spray the others in time and had no ill effects.
Bottom line, if you are growing outdoors and have those moths that lay eggs, I'm pretty sure BT is the only way to prevent an infestation.
I use azamax, with good results. I may still end up seeing 1 or 2 worms a season, but prior to azamax i was having a hard time getting rid of worm infestation. I would spend hours every evening looking for worms till my eyes were crossed! In my area the worms dont show up until about 1.5-2 months after the first flowers show. This is right around the time that buds start getting nice and sugary, but still a ways away from harvest. Thanks for the info Thedudefresco!