How long does BT keep?

Pyrrho · June 21, 2012

I bought a bottle of Bt last year to prevent earworm damage on my corn and had good results. I only used a couple of teaspoons to mix with food grade mineral oil, so I've got nearly a full bottle and some of the oil mixture left over. They've been in my garage over the winter (which was mild), and I'd like to know whether either form will have lost its effectiveness. For the cost of a new bottle, I'd hate to find out the hard way, but I don't like the idea of dumping a whole bottle every year.

Any ideas?

June 21, 2012	#1
Pyrrho Tomatovillian™ Join Date: Nov 2010 Location: Louisville, KY Posts: 75	How long does BT keep? I bought a bottle of Bt last year to prevent earworm damage on my corn and had good results. I only used a couple of teaspoons to mix with food grade mineral oil, so I've got nearly a full bottle and some of the oil mixture left over. They've been in my garage over the winter (which was mild), and I'd like to know whether either form will have lost its effectiveness. For the cost of a new bottle, I'd hate to find out the hard way, but I don't like the idea of dumping a whole bottle every year. Any ideas?