Q&A – Should I use BT preventatively or wait until I see caterpillars?

Question:
If BT is safe, should we use it preventatively or wait until we see the caterpillar? 

Answer: 
BT is safe but it does not make sense to use it until you see caterpillars or their damage.

Related Videos:
BT (Bacillus Thuringiensis)

Related Resources:
Bacillus thuringiensis (Bt)
Bacillus thuringiensis (Bt) General Fact Sheet
Commonly Asked Questions About Btk (Bacillus thuringiensis var. kurstaki)