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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