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Table 5 Activity of Bacillus thuringiensis formulations against neonate and 2nd larvae of Spodoptera littoralis at different storage conditions

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 Conditions LC50 (mg/L) LC90 (mg/L) x 2 Slope ± SE Toxicity index
Neonate larvae
 Dipel 2× 0 948.18 9067.25 3.37 1.307 ± 0.12 100
1 3156.95 24,948.50 4.53 1.428 ± 0.16 30.03
2 3460.22 28,855.13 2.86 1.391 ± 0.22 27.40
 Protecto 0 1577.92 33,715.81 1.16 0.935 ± 0.11 100
1 4233.44 37,038.06 1.07 1.422 ± 0.19 37.27
2 4504.29 38,769.82 2.88 1.371 ± 0.19 35.03
2nd larvae
 Dipel 2× 0 931.99 17,905.98 6.97 0.998 ± 0.11 100
1 2069.06 10,281.37 1.26 1.841 ± 0.12 45.04
2 4067.42 24,013.61 8.34 1.662 ± 0.19 22.91
 Protecto 0 1530.31 59,547.43 0.56 0.806 ± 0.11 100
1 4051.99 25,819.24 6.67 1.593 ± 0.19 37.77
2 5000.50 71,826.85 1.02 1.107 ± 0.22 30.60
  1. 0—zero time where each mg contain 31,289 IU for Dipel 2× and 30,155 IU for Protecto
  2. 1—storage at 35 ± 2 °C for 12 weeks where each mg contain 29,156 IU for Dipel 2× and 26,379 IU for Protecto
  3. 2—storage under direct sunlight for 2 days where each mg contain 24,889 IU for Dipel 2× and 23,610 IU for Protecto