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Table 6 Effect of photolysis in water for 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)

Bioinsecticides Time/hours Water source
Nile water Ground water Drain water
IU/mg Loss % IU/mg Loss % IU/mg Loss %
Dipel 2× 0 28,834 0 28,376 0 28,376 0
1 27,965 3.01 27,644 2.58 27,920 1.61
2 26,920 6.64 26,834 5.43 26,844 5.40
4 25,400 11.91 25,465 10.26 25,320 10.77
24 20,200 29.94 20,320 28.39 18,844 33.59
72 13,712 52.44 13,200 53.48 13,010 54.15
120 11,100 61.50 11,134 60.76 10,844 61.78
Regression equation (y =) − 0.0185x + 10.19 − 0.0162x + 10.19 − 0.0153x + 10.18
Degradation rate (K) 0.01853 0.01621 0.01527
t½ h 37.40 42.76 45.40
Determination coefficient (R2) 0.97 0.96 0.94
Protecto 0 27,560 0 27,560 0 27,560 0
1 26,245 4.77 26,263 4.71 26,400 4.21
2 24,710 10.34 24,534 10.98 24,821 9.94
4 23,400 15.09 23,279 15.53 23,144 16.02
24 18,555 32.67 18,979 31.14 17,910 35.01
72 12,310 55.33 12,266 55.49 12,200 55.73
120 9117 66.92 9355 66.06 8934 67.58
Regression equation (y =) − 0.0259x + 10.13 − 0.0263x + 10.13 − 0.0254x + 10.13
Degradation rate (K) 0.02589 0.02632 0.02537
t½ h 26.77 26.33 27.32
Determination coefficient (R2) 0.98 0.98 0.97