Concentration (ppm) |
Concentration difference |
No. of alive larvae |
No. of dead larvae |
Mean death |
Mean death Concentration difference |
0 (control) 0 (check) 200 400 600 800 1000 1200 1400 |
0 0 200 200 200 200 200 200 200 |
20 20 20 18 14 12 8 5 0 |
0 0 0 2 6 8 12 15 20 |
0 0 0 1 4 7 10 13.5 17.5 |
0 0 0 200 800 1400 2000 2700 3500 |
Total 10,600 |
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The LC50 value of the seed extract of Calotrpis procera for 48 h has been determined according to the arithmetic method of Karber (1931). The calculation was done as following:
LC50 = 1400 – 530
LC50 = 870ppm
