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Table 7 Effect of exposed to UV light of the Bacillus thuringiensis formulations

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/hour Bacillus thuringiensis
Dipel 2× Protecto
IU/mg Loss % IU/mg Loss %
0 28,800 0 27,733 0
1 26,667 7.41 24,533 11.54
2 22,400 22.22 20,267 26.92
4 17,066 40.74 16,000 42.31
8 12,800 55.56 9600 65.38
Regression equation y = − 0.0870x + 10.25 − 0.1098x + 10.22
Degradation rate (K) 0.08697 0.10985
t½ h 7.97 6.31
Determination coefficient (R2) 0.96 0.99