From: Influence of some environmental conditions on stability and activity of Bacillus thuringiensis formulations against the cotton leaf worm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)
Time
Bacillus thuringiensis
Dipel 2×
Protecto
Content a.i IU/mg
Loss %
Zero time
31,289
0
30,155
3 months
30,578
2.27
29,155
3.32
6 months
6.82
27,379
9.21
24 months (2 years)
26,665
14.79
23,372
22.49